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    • 专利摘要:
    The present invention relates to A lettuce plant resistant to
    公开号:AU2013224205A1
    申请号:U2013224205
    申请日:2013-02-20
    公开日:2014-09-11
    发明作者:Johannes Wilhelmus Schut；Arnaud Paul Pierre Thabuis；Arie Vogelaar
    申请人:Rijk Zwaan Zaadteelt en Zaadhandel BV；
    IPC主号:A01H5-00
    专利说明:
    WO 2013/124310 PCT/EP2013/053367 1 R-GENES IN COUPLING PHASE The invention relates to plants and plant parts, in particular lettuce plants (Lactuca sativa L.), which are 5 resistant to Bremia lactucae. The invention also relates to seeds of these plants capable of producing Bremia lactucae resistant plants. The invention further relates to methods for obtaining said plants with altered genotypes and seeds thereof, which are resistant to Bremia lactucae. 10 Downy mildew is a serious pest worldwide, in both glasshouse and open field production of lettuce plants (Lactuca sativa L.). Lettuce downy mildew is caused by the fungus Bremia lactucae, belonging to a class of relatively primitive fungi known as Oomycetes. The fungus is an 15 obligate parasite capable of infecting a lettuce plant in any growth stage from seedling to mature plant. Co-evolution of the plant and the pathogen has led to an arms race in which the resistance of the plant can be broken down as a consequence of the capability of the 20 pathogen to interact with and modify alternative host targets or the same targets in a different way. One breeding technique to slow down the fast gain of virulence from Bremia population is to associate different Bremia resistance genes (also called pyramiding or 25 stacking). One limit of this strategy is that the different Bremia resistance genes (R-genes) are grouped in a limited number of locations. Such locations are called resistance gene clusters. In lettuce, at least 4 major resistance gene clusters are known lying on chromosome 1, chromosome 2, 30 chromosome 4, and chromosome 8, respectively. R-genes from the same cluster can segregate as alleles or tightly linked genes. Therefore, it is often impossible to stack R-genes from the same cluster, because genes on the same cluster are WO 2013/124310 PCT/EP2013/053367 2 in repulsion phase with each other, and are inherited like alternative alleles of the same locus. In breeding lettuce, which is a diploid crop, the opportunity of pyramiding dominant Bremia-genes on the same resistance gene cluster is 5 therefore limited to a maximum of two genes per cluster. This maximum can only be reached in heterozygous plants with a single copy for each gene. However, providing heterozygous lettuce plants to growers implies the use of hybrid varieties. Unfortunately the production of hybrid lettuce 10 seed is considered too expensive, too risky and too complicated. Therefore in practice almost all lettuce varieties are inbred lines. In an inbred line the number of genes per cluster is limited to one, which is then present in a homozygous state with two copies for the gene. 15 As mentioned earlier, there is a continuous arms race going on between the plant and the pathogen and during this race R-genes are constantly broken and breeders need alternative resistance sources in order to keep producing resistant varieties. Every new combination of R-genes is 20 therefore a valuable asset for the breeder. Given the significant advantages of stacking R genes, it is the object of the present invention to provide lettuce plants with a new combination of R-genes in coupling phase, which were previously only found in repulsion phase, 25 inherited as alternative alleles, and therefore not stackable. In the research leading to the present invention new lettuce plants were developed which have in their genome Bremia R-genes Dm3, Dm6 and R18 in coupling phase. These 30 three R-genes are all on the resistance cluster of chromosome 2 of Lactuca sativa L. Together these genes confer resistance to Bremia lactucae races Bl:1, Bl:4, Bl:5, WO 2013/124310 PCT/EP2013/053367 3 Bl:6, Bl:7, Bl:10, Bl:12, B1:13, Bl:14, Bl:15, Bl:16, Bl:17, Bl:18, B1:21, B1:22, B1:23, B1:24, Bl:25 and B1:28. Although a similar resistance profile can be obtained by combining other R-genes, the advantage of having 5 these three genes in coupling phase is the fact that the possibilities of one resistance gene cluster are used more extensively and that the breeder has new stacking possibilities at hand, slowing down the virulence of the pathogen. 10 The invention thus relates to a lettuce plant resistant to Bremia lactucae races Bl:1, Bl:4, Bl:5, Bl:6, Bl:7, Bl:10, Bl:12, Bl:13, Bl:14, Bl:15, Bl:16, Bl:17, Bl:18, Bl:21, Bl:22, Bl:23, Bl:24, Bl:25 and Bl:28, which plant comprises a genetic determinant which causes the 15 resistance and which genetic determinant is obtainable by introgression from a plant grown from seeds of which a representative sample was deposited under accession number NCIMB 41761, and wherein the said genetic determinant in the seeds of seed deposit number NCIMB 41761 is at least linked 20 to marker SCM05 with SEQ ID NO:4, marker LR0029 with SEQ ID NO:5, and marker LK0036 with SEQ ID NO:6, and optionally also to one or more of the markers selected from the group consisting of marker SCW09 with SEQ ID NO:1, marker CL922 with SEQ ID NO:2, marker SCV12 with SEQ ID NO:3, marker 25 LR0096 with SEQ ID NO:7, and marker SCIll with SEQ ID NO:8. The invention also relates to a lettuce plant resistant to Bremia lactucae races Bl:1, Bl:4, Bl:5, B1:6, B1:7, B1:10, B1:12, B1:13, B1:14, B1:15, B1:16, B1:17, B1:18, B1:21, B1:22, B1:23, B1:24, B1:25 and Bl:28,, wherein 30 said resistance is conferred by a genetic determinant, characterized in that said genetic determinant consists of Bremia R-genes Dm3, Dm6 and R18 in coupling phase, and wherein said genetic determinant is obtainable from a plant WO 2013/124310 PCT/EP2013/053367 4 grown from seeds of which a representative sample was deposited under accession number NCIMB 41761. The invention further comprises a lettuce plant resistant to Bremia lactucae races Bl:l, Bl:4, Bl:5, Bl:6, 5 Bl:7, Bl:10, Bl:12, Bl:13, Bl:14, Bl:15, Bl:16, Bl:17, Bl:18, Bl:21, Bl:22, Bl:23, Bl:24, Bl:25 and Bl:28,, wherein said resistance is conferred by a genetic determinant, characterized in that said genetic determinant consists of Bremia R-genes Dm3, Dm6 and R18 in coupling phase, and 10 wherein said genetic determinant in plants grown from seeds deposited under accession number NCIMB 41761 is identifiable by the presence of marker SCM05 with SEQ ID NO:4, marker LR0029 with SEQ ID NO:5, and marker LK0036 with SEQ ID NO:6, and optionally also markers selected from the group 15 consisting of marker SCW09 with SEQ ID NO:1, marker CL922 with SEQ ID NO:2, marker SCV12 with SEQ ID NO:3, marker LR0096 with SEQ ID NO:7, and marker SCIll with SEQ ID NO:8.In a particular embodiment, the genetic determinant comprises genes Dm3, Dm6 and R18 in coupling phase. The 20 present invention thus provides a new and unique combination of R-genes, giving the breeders a new alternative for developing Bremia lactucae resistant lettuce varieties. The present invention thus provides lettuce plants, which are resistant to Bremia lactucae races Bl:1, Bl:4, 25 Bl:5, B1:6, B1:7, B1:10, B1:12, B1:13, B1:14, B1:15, B1:16, B1:17, B1:18, B1:21, B1:22, B1:23, B1:24, B1:25 and B1:28, wherein said resistance is conferred by R-genes Dm3, Dm6 and R18, which are present in coupling phase on a genetic determinant, which is as found in plants grown from seeds of 30 which a representative sample was deposited under NCIMB deposit accession number NCIMB 41761 on 29 September 2010. The combination of these R-genes from the same cluster, such that they are in coupling phase instead of WO 2013/124310 PCT/EP2013/053367 5 repulsion phase, offers many advantages. The R-genes in coupling phase can be regarded as a new super R-gene which would confer resistance against more Bremia lactucae races. Also, the inheritance of R-genes in coupling phase is 5 similar to that of a single gene and therefore increases breeding efficiency. The invention thus relates to a lettuce plant having the three R-genes Dm3, Dm6 and R18, present in its genome in coupling phase, such that the three R-genes are inherited 10 together in a dominant fashion as a single allele. In one embodiment the lettuce plant of the invention carries the R-genes Dm3, Dm6 and R18 as a single allele as present in the genome of seeds of which a representative sample was deposited under accession number NCIMB 41761, 15 which allele causes resistance to at least Bremia lactucae races Bl:1, Bl:4, Bl:5, Bl:6, Bl:7, Bl:10, Bl:12, Bl:13, Bl:14, Bl:15, Bl:16, Bl:17, Bl:18, Bl:21, Bl:22, Bl:23, Bl:24, Bl:25 and Bl:28. According to a further aspect thereof, the invention 20 provides a genetic determinant comprising the R-genes Dm3, Dm6 and R18, characterised in that said R-genes are in coupling phase and thus behave as one allele of a single dominant gene.Resistances against Bremia races covered by the separate R-genes Dm3, Dm6 and R18 and those R-genes in 25 coupling phase are specified in Table 1. Resistances against six Bremia races are conferred by more than one R-gene, resistances against the remaining Bremia races are conferred by only one R-gene. The Dm3 specific resistances are against Bremia races Bl:18, Bl:22, Bl:24, Bl:25 and Bl:28. The only 30 Dm6 specific resistance is against Bl:17. Resistances specifically conferred by R18 are against Bremia races Bl:2, Bl:7, Bl:10, Bl:14, Bl:21, and Bl:23 (See Table 1).
    WO 2013/124310 PCT/EP2013/053367 6 Table 1 Resistances conferred by R-genes Dm3, Dm6 and R18 separately and in coupling phase - indicates a resistant reaction 5 (-) also indicates a resistant reaction, but in the seedling test a very limited amount of sporulation might be observed + indicates a susceptible reaction * Resistance unique for Dm3 ** Resistance unique for Dm6 10 * Resistance unique for R18 Dm3 + Dm6 + R18 Bremia lactucae R-gene R-gene R-gene in coupling strain Dm3 Dm6 R18 phase Bl:1 Bl:2 + + (-) (-) Bl:4 (-) (-) Bl:5 + - Bl:6 (-) Bl:7 + + Bl:10 + + Bl:12 + Bl:13 + (-) Bl:14 + + Bl:15 + - Bl:16 + + Bl:17 + - + Bl:18 + + Bl:20 + + + Bl:21 + + Bl:22 + + Bl:23 + + Bl:24 + + Bl:25 + + Bl:26 + + + + Bl:27 + + + + Bl:28 + + In one embodiment the invention relates to a lettuce plant resistant to Bremia lactucae races Bl:1, Bl:4, Bl:5, WO 2013/124310 PCT/EP2013/053367 7 Bl:6, Bl:7, Bl:10, Bl:12, B1:13, Bl:14, Bl:15, Bl:16, Bl:17, Bl:18, B1:21, B1:22, B1:23, B1:24, Bl:25 and B1:28, wherein said resistance is obtainable by introgression from a plant grown from seeds of which a representative sample was 5 deposited with the NCIMB under accession number NCIMB 41761, and wherein the said resistance in the seeds of the seed deposit number NCIMB 41761 is linked to marker SCW09 with SEQ ID NO:1, and marker CL922 with SEQ ID NO:2, and marker SCV12 with SEQ ID NO:3, and marker SCM05 with SEQ ID NO:4, 10 and marker LR0029 with SEQ ID NO:5, and preferably also to marker LR0096 with SEQ ID NO:7, and marker SCI11 with SEQ ID NO:8. In another embodiment the invention relates to a lettuce plant resistant to Bremia lactucae races Bl:l, Bl:4, 15 Bl:5, Bl:6, Bl:7, Bl:10, Bl:12, Bl:13, Bl:14, Bl:15, Bl:16, Bl:17, Bl:18, B1:21, B1:22, B1:23, Bl:24, B1:25 and Bl:28, said plant comprising an introgression comprising Dm3, Dm6 and R18, wherein said introgression is obtainable from a lettuce plant of which representative seed is deposited with 20 the NCIMB under accession number NCIMB 41761 and wherein the said introgression in the seeds of the seed deposit number NCIMB 41761 is linked to marker SCW09 with SEQ ID NO:1, and marker CL922 with SEQ ID NO:2, and marker SCV12 with SEQ ID NO:3, and marker SCM05 with SEQ ID NO:4, and marker LR0029 25 with SEQ ID NO:5, and preferably also to marker LR0096 with SEQ ID NO:7, and marker SCI11 with SEQ ID NO:8. In another embodiment the invention relates to a lettuce plant resistant to Bremia lactucae races Bl:1, Bl:4, B1:5, B1:6, B1:7, B1:10, B1:12, B1:13, B1:14, B1:15, B1:16, 30 B1:17, B1:18, B1:21, B1:22, B1:23, B1:24, B1:25 and B1:28, said plant comprising an introgression obtainable from a lettuce plant, representative seeds of which were deposited with the NCIMB under accession number NCIMB 41761, which WO 2013/124310 PCT/EP2013/053367 8 introgression comprises genes Dm3, Dm6 and R18 in coupling phase linked to the marker SCW09 with SEQ ID NO:1, and marker CL922 with SEQ ID NO:2, and marker SCV12 with SEQ ID NO:3, and marker SCM05 with SEQ ID NO:4, and marker LR0029 5 with SEQ ID NO:5, and preferably also to marker LR0096 with SEQ ID NO:7, and marker SCIll with SEQ ID NO:8. An introgression in this respect relates to a part of chromosome 2 that comprises the resistance genes Dm3, Dm6 and R18 in coupling phase. 10 The markers SCM05, LR0029 and LK0036 together provide a haplotype pattern that is unique for the R-genes Dm3, Dm6 and R18 in coupling phase as found in seeds of the deposit, which were deposited with the NCIMB under accession number NCIMB 41761. The said haplotype is thus predictive 15 for the R-genes Dm3, Dm6 and R18 in coupling phase as found in seeds of the said deposit. The haplotype can be extended with one or more of the markers SCW09, CL922, SCV12, LR0096 and SCIll. Other, more extended haplotypes thus consist for example of markers SCW09, CL922, SCV12, SCM05, LR0029 and 20 LK0036 or markers SCW09, CL922, SCV12, SCM05, LR0029, LK0036, LR0096 and SCIll or other combinations that always comprise at least SCM05, LR0029 and LK0036 and one or more of markers SCW09, CL922, SCV12, LR0096 and SCI11. The extended haplotypes are also predictive for the R-genes Dm3, 25 Dm6 and R18 in coupling phase as found in seeds of the deposit which were deposited with the NCIMB under accession number NCIMB 41761 and may lead to a better identification of the presence of the genetic determinant. The sequences of the markers are mentioned in Table 30 4, and the corresponding primers that can be used to amplify the markers are mentioned in Table 5. One aspect of the invention thus relates to a genetic determinant comprising the R-genes Dm3, Dm6 and R18 WO 2013/124310 PCT/EP2013/053367 9 in coupling phase, which can be identified in plants grown from seeds deposited under accession number NCIMB 41761 by a unique haplotype comprising at least marker SCM05 with SEQ ID NO:4, marker LR0029 with SEQ ID NO:5, and marker LK0036 5 with SEQ ID NO:6, and optionally also markers selected from the group consisting of marker SCW09 with SEQ ID NO:1, marker CL922 with SEQ ID NO:2, marker SCV12 with SEQ ID NO:3, marker LR0096 with SEQ ID NO:7, and marker SCIll with SEQ ID NO:8. 10 In a still further embodiment the invention relates to a lettuce plant, which is resistant to Bremia lactucae races Bl:1, Bl:4, Bl:5, Bl:6, Bl:7, Bl:10, Bl:12, Bl:13, Bl:14, Bl:15, Bl:16, Bl:17, Bl:18, Bl:21, Bl:22, Bl:23, Bl:24, Bl:25 and Bl:28, and which plant is obtainable by 15 crossing a lettuce plant grown from seeds of which a representative sample was deposited with the NCIMB under accession number NCIMB 41761, and selecting in the F2 progeny of the cross that is obtained after crossing the F1 with itself or with another plant for plants showing 20 resistance to Bremia lactucae races Bl:1, Bl:4, Bl:5, Bl:6, Bl:7, Bl:10, Bl:12, Bl:13, Bl:14, Bl:15, Bl:16, Bl:17, Bl:18, Bl:21, Bl:22, Bl:23, Bl:24, Bl:25 and Bl:28. The invention further relates to a lettuce plant resistant to Bremia lactucae races Bl:1, Bl:4, Bl:5, Bl:6, 25 Bl:7, Bl:10, Bl:12, Bl:13, Bl:14, Bl:15, Bl:16, Bl:17, Bl:18, Bl:21, Bl:22, Bl:23, Bl:24, Bl:25 and Bl:28, wherein said resistance is conferred by resistance genes Dm3, Dm6 and R18, which genes are present in homozygous form, wherein said genes are obtainable by introgressing said genes from a 30 plant grown from seeds of which a representative sample was deposited with the NCIMB under accession number NCIMB 41761, and wherein the said resistance genes are present in seed of deposit number NCIMB 41761 and are linked therein to marker WO 2013/124310 PCT/EP2013/053367 10 SCW09 with SEQ ID NO:1, and marker CL922 with SEQ ID NO:2, and marker SCV12 with SEQ ID NO:3, and marker SCM05 with SEQ ID NO:4, and marker LR0029 with SEQ ID NO:5, and preferably also to marker LR0096 with SEQ ID NO:7, and marker SCIll 5 with SEQ ID NO:8. When the R-genes are not in coupling phase but in repulsion phase a similar resistance pattern can be found only in a plant comprising the R-genes in heterozygous state. This is for instance the case when a plant comprising 10 the Dm3 resistance gene in homozygous state is crossed with a plant comprising Dm6 and R18 in homozygous state. A completely heterozygous Fl is obtained, comprising all R genes, but on the different homologous chromosomes. When plants of such an F1 are selfed (Fig. 2), an F2 is obtained 15 which consists for 50% out of plants fully resistant to all Bremia lactucae races covered by the R-genes Dm3, Dm6 and R18; 25% of the plants of the F2 only cover the resistances against the Bremia lactucae covered by Dm3 (see Table 1); and the remaining 25% of the plants are only resistant to 20 those races covered by R-genes Dm6 and R18 (see Table 1). In case the F2 is tested with a mixture of three Bremia lactucae races unique for each R-gene (e.g. Bl:16, Bl:17, and Bl:18), 50% of the plants are scored as being resistant, while the others will all show symptoms of infection. 25 A plant of the invention comprising the R-genes Dm3, Dm6 and R18 in coupling phase would show a different result. When a plant comprising the R-genes Dm3, Dm6 and R18 in coupling phase in homozygous state is crossed with a fully susceptible plant, all F1 plants would be heterozygous and 30 fully resistant to the Bremia lactucae races covered by all three R-genes. Selfing the F1, will lead to an F2 population consisting for 75% out of resistant plants and for 25% out of fully susceptible plants (Fig. 1), this in contrast with WO 2013/124310 PCT/EP2013/053367 11 an F2 comprising the R-genes in repulsion phase as is described above and in Fig. 2. The R-genes Dm3, Dm6 and R18 when in coupling phase thus behave as a single dominant gene. 5 Distinguishing a plant comprising the R-genes in coupling phase in heterozygous form from a plant comprising the R-genes in coupling phase in homozygous form can be done by selfing the plant, resulting in an inbred offspring, for example selfing the F2-plant as shown in Fig. 1 into an F3 10 population, and selecting those plants from the F2 of which the entire inbred offspring is not susceptible to any of the Bremia races covered by R-genes Dm3, Dm6 and R18 as depicted in Table 1, or by selecting any plant from said inbred offspring of which all plants are resistant against the 15 Bremia races covered by R-genes Dm3, Dm6 and R18 as depicted in Table 1. In one aspect the invention thus relates to a lettuce plant resistant to Bremia lactucae race Bl:1, Bl:4, Bl:5, Bl:6, Bl:7, Bl:10, Bl:12, Bl:13, Bl:14, Bl:15, Bl:16, 20 Bl:17, Bl:18, Bl:21, Bl:22, Bl:23, Bl:24, Bl:25 and Bl:28, wherein said resistance is conferred by resistance genes Dm3, Dm6 and R18, which genes are present in homozygous form, wherein said genes are obtainable by a)crossing a susceptible plant with a plant grown 25 from seeds of which a representative sample was deposited under NCIMB accession number 41761. b)selfing the F1 progeny plants in order to obtain F2 progeny plants; c)selecting F2 plants which are resistant to said 30 Bremia lactucae races; d)selfing each of the selected F2 plants in order to obtain an F3 progeny population; WO 2013/124310 PCT/EP2013/053367 12 e)selecting those plants in the F2 of which all F3 progeny plants are resistant to said Bremia lactucae races as plant having the said resistance in homozygous form, or selecting a plant from an F3 population not segregating for 5 the said resistance; Another aspect of the invention relates to a lettuce plant resistant to Bremia lactucae races Bl:1, Bl:4, Bl:5, Bl:6, Bl:7, Bl:10, Bl:12, Bl:13, Bl:14, Bl:15, Bl:16, Bl:17, Bl:18, Bl:21, Bl:22, Bl:23, Bl:24, Bl:25 and Bl:28, wherein 10 said resistance is conferred by resistance genes Dm3, Dm6 and R18 which are present in coupling phase and said genes are present in heterozygous form, wherein said lettuce plant is obtainable from a cross between a susceptible lettuce plant with a plant grown from seeds of which a 15 representative sample was deposited under NCIMB accession number 41761. The seeds deposited under NCIMB 41761 comprise the R-genes Dm3, Dm6 and R18 in coupling phase, which are linked in the seeds of the seed deposit to marker SCW09 with SEQ ID 20 NO:1, and marker CL922 with SEQ ID NO:2, and marker SCV12 with SEQ ID NO:3, and marker SCM05 with SEQ ID NO:4, and marker LR0029 with SEQ ID NO:5, and preferably also to marker LR0096 with SEQ ID NO:7, and marker SCIll with SEQ ID NO:8. 25 In the absence of molecular markers or in the event that recombination between the molecular markers and the genetic determinant have taken place and thus are not predictive anymore, equivalence of genetic determinants can still be determined by an allelism test. To perform an 30 allelism test, material that is homozygous for the known determinant, a tester plant, is crossed with material that is homozygous for the genetic determinant that is to be tested. This latter plant is referred to as the donor plant.
    WO 2013/124310 PCT/EP2013/053367 13 The donor plant to be tested should be or should be made homozygous for the genetic determinant to be tested. The skilled person knows how to obtain a plant that is homozygous for the genetic determinant to be tested. When in 5 the F2 of the cross between a donor plant and a tester plant no segregation for the phenotype related to the genetic determinant is observed, the genetic determinants of the donor plant and the tester plant have been proven to be equivalent. 10 In one embodiment of the invention a lettuce plant is provided that comprises the R-genes Dm3, Dm6 and R18 in coupling phase and thus, when crossed with a tester plant, that comprises the said genes in coupling phase, representative seed of which as deposited with the NCIMB 15 under accession numbers a NCIMB 41761, or a progeny plant thereof that comprises the R-genes in coupling phase comprised in lettuce plants representative seed of which was deposited under accession number NCIMB 41761 or a plant derived therefrom and comprising the said R-genes in 20 coupling phase, plants of first generation progeny (Fl) of said cross show no segregation for the resistance against Bremia lactucae races Bl:1, Bl:4, Bl:5, Bl:6, Bl:7, Bl:10, Bl:12, Bl:13, Bl:14, Bl:15, Bl:16, Bl:17, Bl:18, Bl:21, Bl:22, Bl:23, Bl:24, Bl:25 and Bl:28. 25 In both the tester plant and the plant of the invention the genetic determinant comprising the three R genes in coupling phase is present in homozygous condition. Plants of the second and further generations, if obtained by selfing also show no segregation for the said resistance 30 pattern. The tester plant can be a plant of which representative seed was deposited with the NCIMB under accession number NCIMB 41761. When the genetic determinant responsible for the resistance against Bremia lactucae races WO 2013/124310 PCT/EP2013/053367 14 Bl:1, Bl:4, Bl:5, Bl:6, Bl:7, Bl:10, Bl:12, Bl:13, Bl:14, B1:15, B1:16, B1:17, Bl:18, B1:21, B1:22, B1:23, B1:24, Bl:25 and Bl:28 as comprised in the deposit is present in a plant, the plant is a plant of the invention. 5 In contrast with the other races of Bremia lactucae to which R-genes Dm3, Dm6 and R18 confer resistance, race Bl:2 may show a very limited amount of sporulation in the seedling test. In practise, however, the plants of the invention are also resistant against Bl:2 despite the fact 10 that a limited amount of sporulation might occur in the seedling test. Therefore, the invention also provides lettuce plants resistant to Bremia lactucae races Bl:1, Bl:4, Bl:5, Bl:6, Bl:7, Bl:10, Bl:12, Bl:13, Bl:14, Bl:15, Bl:16, Bl:17, 15 Bl:18, Bl:21, Bl:22, Bl:23, Bl:24, Bl:25 and Bl:28 and also resistant to Bremia lactucae race Bl:2, which resistances are conferred by the R-genes Dm3, Dm6 and R18 present in coupling phase on chromosome 2 in the plant of the invention. 20 Next to the resistances against the Bremia races Bl:1, Bl:4, Bl:5, Bl:6, Bl:13, Bl:15, and Bl:17 (see Table 1), the Ra-gene closely linked to the Dm6 R-gene also confers resistance against root aphid (Pemphigus bursarius). Thus, the invention also relates to lettuce plants 25 resistant to Bremia lactucae races Bl:l, Bl:4, Bl:5, Bl:6, Bl:7, Bl:10, Bl:12, Bl:13, Bl:14, Bl:15, Bl:16, Bl:17, Bl:18, Bl:21, Bl:22, Bl:23, Bl:24, Bl:25 and Bl:28 and resistant to root aphid (Pemphigus bursarius), which resistances are conferred by the R-genes Dm3, Dm6, Ra and 30 R18 present in coupling phase on chromosome 2 in the plant of the invention. In a further aspect thereof the invention relates to lettuce plants resistant to Bremia lactucae races Bl:1, WO 2013/124310 PCT/EP2013/053367 15 Bl:4, Bl:5, Bl:6, Bl:7, Bl:10, Bl:12, Bl:13, Bl:14, Bl:15, B1:16, B1:17, B1:18, Bl:21, Bl:22, Bl:23, Bl:24, Bl:25 and Bl:28 and resistant to Bremia lactucae race Bl:2 and to root aphid (Pemphigus bursarius), which resistances are conferred 5 by the R-genes Dm3, Dm6, Ra and R18 present in coupling phase on chromosome 2 in the plant of the invention. According to a further aspect thereof, the invention relates to propagation material capable of growing into a plant of the invention. 10 In one embodiment, such propagation material is formed by seed of a lettuce plant of the invention, wherein the plant that can be grown from the seed is resistant to Bremia lactucae races Bl:l, Bl:4, Bl:5, Bl:6, Bl:7, Bl:10, Bl:12, Bl:13, Bl:14, Bl:15, Bl:16, Bl:17, Bl:18, Bl:21, 15 Bl:22, Bl:23, Bl:24, Bl:25 and Bl:28. In another embodiment the propagation material capable of growing into a plant of the invention is selected from the group consisting of microspores, pollen, ovaries, ovules, embryos, embryo sacs, egg cells, cuttings, roots, 20 root tips, hypocotyls, cotyledons, stems, leaves, flowers, anthers, seeds, meristematic cells, protoplasts, and cells. In a further embodiment the invention relates to tissue culture of propagation material capable of growing into a plant of the invention. 25 Suitably, the plant produced from the propagation material shows the resistance to Bremia lactucae races Bl:1, Bl:4, Bl:5, Bl:6, Bl:7, Bl:10, Bl:12, Bl:13, Bl:14, Bl:15, Bl:16, Bl:17, Bl:18, Bl:21, Bl:22, Bl:23, Bl:24, Bl:25 and Bl:28, in particular the resistance as found in Lactuca 30 sativa 10G.913566, representative seeds of which were deposited with the NCIMB under accession number NCIMB 41761. The invention also relates to progeny of the plants, cells, tissues and seeds of the invention. Such progeny can WO 2013/124310 PCT/EP2013/053367 16 in itself be plants, cells, tissues or seeds. As used herein the word "progeny" is intended to mean the first and all further descendants from a cross with a plant of the invention that comprises the R-genes Dm3, Dm6 and R18 in 5 coupling phase. "Progeny" also encompasses plants that carry the trait of the invention and are obtained from other plants or progeny of plants of the invention by vegetative propagation or multiplication. In one embodiment the invention relates to progeny 10 of a lettuce plant of the invention, wherein the progeny plant is resistant to Bremia lactucae races Bl:1, Bl:4, Bl:5, Bl:6, Bl:7, Bl:10, Bl:12, Bl:13, Bl:14, Bl:15, Bl:16, Bl:17, Bl:18, Bl:21, Bl:22, Bl:23, Bl:24, Bl:25 and Bl:28. The invention further relates to the head of a 15 lettuce plant of the invention. The invention also relates to a food product, comprising the lettuce head or parts thereof, optionally in processed form. In particular, the food product comprises leaves of the lettuce plant or parts thereof. The food 20 product is for example a salad or a salad mixture comprising leaves of the lettuce plant of the invention. Markers linked to the R-genes Dm3, Dm6 and R18 in coupling phase were developed on a population of F2 plants segregating for the trait of the invention, using publicly 25 available markers which span a large part of the Bremia resistance cluster on chromosome 2. The markers listed in Table 4 formed a unique haplotype which is predictive for the presence of R-genes Dm3, Dm6 and R18 in coupling phase. Table 4 lists the sequences of the markers and Table 5 the 30 corresponding primers used to amplify them. The invention further relates to a nucleic acid molecule causative of resistance against Bremia lactucae races Bl:1, Bl:4, Bl:5, Bl:6, Bl:7, Bl:10, Bl:12, Bl:13, WO 2013/124310 PCT/EP2013/053367 17 Bl:14, Bl:15, Bl:16, Bl:17, Bl:18, Bl:21, Bl:22, Bl:23, Bl:24, Bl:25 and Bl:28 comprising a DNA sequence which comprises the three R-genes Dm3, Dm6 and R18 in coupling phase, which DNA sequence is positioned on chromosome 2 and 5 linked to marker SCW09 with SEQ ID NO:1, and marker CL922 with SEQ ID NO:2, and marker SCV12 with SEQ ID NO:3, and marker SCM05 with SEQ ID NO:4, and marker LR0029 with SEQ ID NO:5, and preferably also to marker LR0096 with SEQ ID NO:7, and marker SCIll with SEQ ID NO:8. 10 The invention further relates to the use of said nucleic acid molecule and/or said markers linked to said nucleic acid molecule for the identification of plants comprising Bremia lactucae resistance conferring genes Dm3, Dm6 and R18 in coupling phase. 15 The invention also relates to the use of said nucleic acid molecule and/or said markers to develop other markers linked to the Bremia lactucae resistance conferring genes Dm3, Dm6 and R18 in coupling phase. In one aspect, the invention relates to a process 20 for producing lettuce plants comprising R-genes Dm3, Dm6 and R18 in coupling phase, comprising the step of selecting said lettuce plants from a population of lettuce plants segregating for these genes in coupling phase using marker SCW09 with SEQ ID NO:1, and marker CL922 with SEQ ID NO:2, 25 and marker SCV12 with SEQ ID NO:3, and marker SCM05 with SEQ ID NO:4, and marker LR0029 with SEQ ID NO:5, and preferably also to marker LR0096 with SEQ ID NO:7, and marker SCIll with SEQ ID NO:8. The term 'genetic determinant' as used herein 30 encompasses one or more QTLs, genes, or alleles. These terms are used interchangeably. 'Genetic background' or 'genetic information' can be used instead of 'genetic determinant', and can comprise more than one relevant QTL, gene, or WO 2013/124310 PCT/EP2013/053367 18 allele. In addition, the phrase 'genetic determinants' can be used. 'Genetic background' can also include more of the genome than only the QTL, gene, or allele that is indicated or that is identified. Genetic background can in addition be 5 defined as 'genotype'. A genetic determinant can be identified by the use of a molecular marker. A genetic determinant can alternatively be identified by the position on a genetic map, or by indication of the location on a linkage group or chromosome. When a genetic determinant is 10 not linked to a specific molecular marker any longer, but its position on a chromosome as defined on a genetic map is unaltered, this genetic determinant is still the same as when it was linked to the molecular marker. The genetic trait that it confers is therefore also still the same. The 15 'genetic trait' is the trait or characteristic that is conferred by the genetic determinant. In this specific case where the R-genes Dm3, Dm6 and R18 are in coupling phase and behave as a dominant single gene also 'trait' and 'genetic determinant' can be used interchangeably. The genetic trait 20 can be identified phenotypically, for example by performing a bio-assay. However, also plant stages for which no phenotypic assay can be performed do carry the genetic information that leads to the genetic trait. 'Trait' or 'phenotypic trait' can be used instead of 'genetic trait'. 25 In one embodiment, the invention relates to lettuce plants of the invention that carry the genetic determinant comprising R-genes Dm3, Dm6 and R18 in coupling phase and having acquired said determinant by introduction of the genetic information that is responsible for the trait from a 30 suitable source, either by conventional breeding, or genetic modification, in particular by cisgenesis or transgenesis. Cisgenesis is genetic modification of plants with a natural gene, coding for an (agricultural) trait, from the crop WO 2013/124310 PCT/EP2013/053367 19 plant itself or from a sexually compatible donor plant. Transgenesis is genetic modification of a plant with a gene from a noncrossable species or a synthetic gene. The invention also relates to the germplasm of 5 plants of the invention. The germplasm is constituted by all inherited characteristics of an organism and according to the invention encompasses at least the genetic determinant of the invention. The germplasm can be used in a breeding program for the development of Bremia lactucae resistant 10 lettuce plants. In one aspect the invention relates to a method for production of a lettuce plant comprising Bremia R-genes Dm3, Dm6 and R18 in coupling phase, comprising a) crossing a plant comprising Bremia R-genes Dm3, 15 Dm6 and R18 in coupling phase with another plant; b) selfing the resulting F1 for obtaining F2 plants; c) selecting plants comprising Bremia R-genes Dm3, Dm6 and R18 in coupling phase in the F2; d) optionally performing one or more additional 20 rounds of selfing or crossing, and subsequently selecting, for a plant comprising Bremia R-genes Dm3, Dm6 and R18 in coupling phase. It is clear that the parent that provides the trait of the invention is not necessarily a plant grown directly 25 from the deposited seeds. The parent can also be a progeny plant from the seed or a progeny plant from seeds that are identified to have the trait of the invention by other means. In one aspect, the invention relates to a method for 30 production of a lettuce plant comprising Bremia R-genes Dm3, Dm6 and R18 in coupling phase, comprising a) crossing a plant comprising Bremia R-genes Dm3, Dm6 and R18 in coupling phase with another plant; WO 2013/124310 PCT/EP2013/053367 20 b) optionally backcrossing the resulting Fl with the preferred parent; c) selecting for plants comprising Bremia R-genes Dm3, Dm6 and R18 in coupling phase in the F2 or BC1; 5 d) optionally performing one or more additional rounds of selfing or crossing or backcrossing, and subsequently selecting, for a plant comprising Bremia R genes Dm3, Dm6 and R18 in coupling phase. The invention additionally provides a method of 10 introducing a desired trait into a lettuce plant comprising Bremia R-genes Dm3, Dm6 and R18 in coupling phase, comprising: a) crossing a lettuce plant comprising Bremia R genes Dm3, Dm6 and R18 in coupling phase, representative 15 seed of which were deposited with the NCIMB under deposit number NCIMB 41761, with a second lettuce plant that comprises a desired trait to produce F1 progeny; b) selecting an Fl progeny that comprises Bremia R genes Dm3, Dm6 and R18 in coupling phase and the desired 20 trait; c) crossing the selected F1 progeny with either parent, to produce backcross progeny; d) selecting backcross progeny comprising the desired trait and/or Bremia R-genes Dm3, Dm6 and R18 in 25 coupling phase; and e) optionally repeating steps c) and d) one or more times in succession to produce selected fourth or higher backcross progeny that comprises the desired trait and Bremia R-genes Dm3, Dm6 and R18 in coupling phase. The 30 invention includes a lettuce plant produced by this method. In one embodiment selection for plants comprising Bremia R-genes Dm3, Dm6 and R18 in coupling phase is done in the F1 or in the backcross progeny. According to another WO 2013/124310 PCT/EP2013/053367 21 aspect selection for the trait of the invention is started in the F2 of a cross or alternatively of a backcross. In one embodiment, selection for plants comprising Bremia R-genes Dm3, Dm6 and R18 in coupling phase is started 5 in the F3 or a later generation. In a further embodiment the plant comprising the Bremia R-genes Dm3, Dm6 and R18 in coupling phase is a plant of an inbred line, a hybrid, a doubled haploid, or of a segregating population. 10 The invention further provides a method for the production of a lettuce plant comprising Bremia R-genes Dm3, Dm6 and R18 in coupling phase by using a doubled haploid generation technique to generate a doubled haploid line comprising the said Bremia R-genes Dm3, Dm6 and R18 in 15 coupling phase. The invention furthermore relates to hybrid seed and to a method for producing hybrid seed comprising crossing a first parent plant with a second parent plant and harvesting the resultant hybrid seed, wherein said first 20 parent plant and/or said second parent plant is the plant as claimed. In one embodiment, the invention relates to a method for producing a hybrid lettuce plant comprising crossing a first parent lettuce plant with a second parent lettuce 25 plant and harvesting the resultant hybrid lettuce seed, in which the first parent lettuce plant and/or the second parent lettuce plant comprises Bremia R-genes Dm3, Dm6 and R18 in coupling phase. The invention also relates to a method for the 30 production of a lettuce plant comprising Bremia R-genes Dm3, Dm6 and R18 in coupling phase by using a seed that comprises a genetic determinant in its genome that leads to Bremia R genes Dm3, Dm6 and R18 in coupling phase for growing the WO 2013/124310 PCT/EP2013/053367 22 said lettuce plant. The seeds are suitably seeds of which a representative sample was deposited with the NCIMB under deposit number NCIMB 41761. The invention also relates to a method for seed 5 production comprising growing lettuce plants from seeds of which a representative sample was deposited with the NCIMB under deposit number NCIMB 41761, allowing the plants to produce seeds, and harvesting those seeds. Production of the seeds is suitably done by crossing or selfing. 10 In one embodiment, the invention relates to a method for the production of a lettuce plant comprising Bremia R genes Dm3, Dm6 and R18 in coupling phase by using tissue culture. The invention furthermore relates to a method for the production of a lettuce plant comprising Bremia R-genes 15 Dm3, Dm6 and R18 in coupling phase by using vegetative reproduction. In one embodiment, the invention relates to a method for the production of a lettuce plant comprising Bremia R genes Dm3, Dm6 and R18 in coupling phase by using a method 20 for genetic modification to introgress Bremia R-genes Dm3, Dm6 and R18 in coupling phase into the lettuce plant. Genetic modification comprises transgenic modification or transgenesis, using a gene from a non-crossable species or a synthetic gene, and cisgenic modification or cisgenesis, 25 using a natural gene, coding for an (agricultural) trait, from the crop plant itself or from a sexually compatible donor plant. The invention also relates to a breeding method for the development of lettuce plants that comprise Bremia R 30 genes Dm3, Dm6 and R18 in coupling phase wherein germplasm comprising Bremia R-genes Dm3, Dm6 and R18 in coupling phase is used. Representative seed of said plant comprising the genetic determinant and being representative for the WO 2013/124310 PCT/EP2013/053367 23 germplasm was deposited with the NCIMB under deposit number NCIMB 41761. In a further embodiment the invention relates to a method for the production of a lettuce plant comprising 5 Bremia R-genes Dm3, Dm6 and R18 in coupling phase wherein progeny or propagation material of a plant comprising the genetic determinant conferring said Bremia R-genes Dm3, Dm6 and R18 in coupling phase is used as a source to introgress Bremia R-genes Dm3, Dm6 and R18 in coupling phase into 10 another lettuce plant. Representative seed of said plant comprising the genetic determinant was deposited with the NCIMB under deposit number NCIMB 41761. The invention provides preferably a lettuce plant showing Bremia R-genes Dm3, Dm6 and R18 in coupling phase, 15 which plant is obtainable by any of the methods herein described. The invention further relates to a cell of a lettuce plant (Lactuca sativa), which lettuce plant comprises R genes Dm3, Dm6, and R18 in coupling phase as present in a 20 lettuce plant grown from seed of which a representative sample was deposited with NCIMB on 29 September 2010 and having the accession number 41761. The invention further relates to a cell of a lettuce plant (Lactuca sativa), which lettuce plant comprises R 25 genes Dm3, Dm6, and R18 in coupling phase, which lettuce plant is obtainable by crossing a lettuce plant with a lettuce plant grown from seed of which a representative sample was deposited under NCIMB accession number 41761, and selecting for a lettuce plant that comprises R-genes Dm3, 30 Dm6, and R18 in coupling phase, and thus shows resistance to Bremia lactucae race Bl:1, Bl:4, Bl:5, Bl:6, Bl:7, Bl:10, Bl:12, Bl:13, Bl:14, Bl:15, Bl:16, Bl:17, Bl:18, Bl:21, Bl:22, Bl:23, Bl:24, Bl:25 and Bl:28.
    WO 2013/124310 PCT/EP2013/053367 24 In one embodiment, the invention relates to the use of seeds, a representative sample of which has NCIMB accession number 41761, for transferring a genetic determinant that comprises R-genes Dm3, Dm6, and R18 in 5 coupling phase into another lettuce plant(Lactuca sativa). In another embodiment, the invention relates to the use of a lettuce plant (Lactuca sativa) which lettuce plant comprises R-genes Dm3, Dm6, and R18 in coupling phase as present in a lettuce plant grown from seed, of which a 10 representative sample was deposited under NCIMB accession number 41761, as a crop. The invention also relates to the use of a lettuce plant (Lactuca sativa) which comprises R-genes Dm3, Dm6, and R18 in coupling phase as present in a lettuce plant grown 15 from seed of which a representative sample was deposited under NCIMB accession number 41761, as a source of seed. In yet another embodiment, the invention relates to the use of a lettuce plant (Lactuca sativa) which comprises R-genes Dm3, Dm6, and R18 in coupling phase as present in a 20 lettuce plant grown from seed of which a representative sample was deposited under NCIMB accession number 41761, as a source of propagating material. Further, the invention relates to a lettuce plant (Lactuca sativa) which comprises R-genes Dm3, Dm6, and R18 25 in coupling phase as present in a lettuce plant grown from seed of which a representative sample was deposited under NCIMB accession number 41761, for consumption. In another embodiment, the invention relates to the use of the genetic determinant comprising R-genes Dm3, Dm6, 30 and R18 in coupling phase, which is as present in seeds of which a representative sample was deposited under NCIMB accession number 41761, for conferring said genetic WO 2013/124310 PCT/EP2013/053367 25 determinant to a lettuce plant (Lactuca sativa) not having R-genes Dm3, Dm6, and R18 in coupling phase. In yet another embodiment, the invention relates to the use of a lettuce plant (Lactuca sativa) as a donor of R 5 genes Dm3, Dm6, and R18 in coupling phase as present in seeds of which a representative sample was deposited under NCIMB accession number 41761. DEPOSITED MATERIAL 10 Seeds comprising the R-genes Dm3, Dm6 and R18 in coupling phase were deposited under NCIMB deposit accession number NCIMB 41761 on 29 September 2010 with NCIMB Ltd., Ferguson Building, Craibstone Estate, Bucksburn, 15 Aberdeen, AB21 9YA Scotland, UK. 15 MARKER INFORMATION Table 4 lists the sequences of the markers linked to R-genes Dm3, Dm6 and R18. Table 5 lists the sequences of the primers, which are used to amplify the corresponding markers 20 of Table 4. The present invention will be further elucidated in the examples that follow. These examples are for illustration purpose only and are not to be construed as limiting this invention in any way. 25 EXAMPLES EXAMPLE 1 Seedling test Seeds of seed lot 10G.913566 and seeds of a lettuce 30 plant belonging to butterhead lettuce variety "Cobham Green" susceptible for Bremia lactucae races Bl:1 to Bl:28 were germinated on wetted filter paper in a closed container to establish an environment of relatively high humidity. After WO 2013/124310 PCT/EP2013/053367 26 seedlings were established i.e. emergence of the cotyledons but the first leaf not yet visible, they were sprayed with a spore suspension of Bremia lactucae races Bl:16, Bl:17, and Bl:18. These races were chosen, because resistance against 5 each of these races is covered by only one of the R-genes in coupling phase (see Table 1). The inoculated seedlings were incubated under controlled conditions being 15'C at 16 hours light, 8 hours dark regime. This seedling test follows more or less the 10 protocol described by Bonnier et al. (New sources of major gene resistance in Lactuca to Bremia lactucae. Euphytica 61:3, 203-211 (1992)). After 8 days, infection was clearly established on the susceptible seedlings of the "Cobham Green" plants, while the seedlings grown from seed lot 15 10G.913566 showed no incidences of sporulation at all.
    WO 2013/124310 PCT/EP2013/053367 27 EXAMPLE 2 A. Transfer of R-genes in coupling phase and phenotypic identification by seedling test A plant grown from seed of seed lot 10G.913566 5 (deposited under accession number NCIMB 41761), comprising the Bremia R-genes Dm3, Dm6 and R18 in coupling phase but no other R-genes was crossed with a plant of butterhead lettuce variety "Cobham Green" susceptible for Bremia lactucae races Bl:1 to Bl:28, and thus containing no R-genes. F1 seeds were 10 germinated and the resulting F1 plants were selfed in order to obtain F2 seeds. Seedling tests as described in Example 1 were performed on twelve F2 seedlings resulting from each of the four selfed F1 plants (e.g. 48 F2 seedlings in total), as 15 well as on four seedlings of each parent of the initial cross. On the four susceptible parent seedlings of "Cobham Green", and on approximately 25% (4/12, 3/12, 4/12, 2/12) of the F2 seedlings, sporulating oomycete mycelium on the surface of the cotyledon was observed. The remaining 35 F2 20 plants (approximately 75%) and all the resistant parent plants of seed lot 10G.913566 did not show any sporulating oomycete biomass and were considered to be resistant against Bl:16, Bl:17, and Bl:18, and thus comprising in their genome the R-genes Dm3, Dm6 and R18 in coupling phase. 25 This further demonstrates that the R-genes when in coupling phase, are inherited in a dominant monogenic fashion, since a Chi-square analysis of the observed segregation shows that there is no deviation in the F2 from the expected 3:1 segregation ratio (See also Figure 1).
    WO 2013/124310 PCT/EP2013/053367 28 B. Transfer of R-genes in coupling phase and phenotypic identification by leaf disc test Another cross was made between a plant of variety "Cobham Green" and a plant of the invention (deposit 5 accession number NCIMB 41761). Four F1 plants were selfed and from each F1 plant, twelve F2 seeds were germinated. In order to confirm the presence of the R-genes in coupling phase, leaf discs were taken from the individual F2 plants at the 10-leaf stage. Two leaf discs, per strain, per plant 10 were incubated on wetted filter paper in a closed container to establish an environment of high relative humidity. These leaf discs were inoculated with spore suspensions of Bremia lactucae races Bl:16, Bl:17, or Bl:18. The inoculated leaf discs were incubated under controlled conditions of 15'C at 15 16 hours light, 8 hours dark regime. This leaf disc test is based on the protocol described in Bonnier et al. (Euphytica, 61(3):203-211, 1992). After 8, 11 and 14 days of incubation, the disease index was scored by manual inspection. The disease index is 20 a measure for the level of infection and discriminates between the categories R (resistance) which means no obvious infection, RS (reduced susceptible) which means a significant reduction of the infection as compared to a susceptible control, and S (susceptible) which means heavily 25 infected and strongly sporulating oomycete biomass. For each fysio, 34 plants (71%) were found to be resistant, while 14 plants in each test were found to be susceptible for all three Bremia races (Table 2). Furthermore, the results of the leaf disc test showed 30 that the 34 resistant plants were resistant for all three Bremia races Bl:16, Bl:17, and Bl:18 (Table 2). Therefore, it can be concluded from the results that the R-genes in the WO 2013/124310 PCT/EP2013/053367 29 deposit and the resistant offspring are present in coupling phase (See Fig. 1). Table 2 5 Results from the leaf disc test as described in example 2b. For each plant of the four F2 populations their resistance (R) or susceptibility (S) was scored F2 pop. from plant 1 F2 pop. from plant F2 pop. from plant F2 pop. from plant 2 3 3 Plant Bl. Bl. Bl. Bl. Bl. Bl. Bl. Bl. Bl. Bl. Bl. Bl. Bl. Bl. Bl. nr. 16 17 18 18 16 17 18 18 16 17 18 18 16 17 18 1.01 R R R 2.01 R R R 3.01 R R R 4.01 S S S 1.02 R R R 2.02 S S S 3.02 R R R 4.02 S S S 1.03 R R R 2.03 R R R 3.03 R R R 4.03 R R R 1.04 R R R 2.04 R R R 3.04 S S S 4.04 S S S 1.05 R R R 2.05 R R R 3.05 R R R 4.05 R R R 1.06 R R R 2.06 S S S 3.06 S S S 4.06 R R R 1.07 S S S 2.07 R R R 3.07 R R R 4.07 R R R 1.08 S S S 2.08 R R R 3.08 R R R 4.08 R R R 1.09 R R R 2.09 R R R 3.09 S S S 4.09 R R R 1.10 R R R 2.10 R R R 3.10 R R R 4.10 R R R 1.11 R R R 2.11 R R R 3.11 R R R 4.11 R R R 1.12 S S S 2.12 S S S 3.12 S S S 4.12 S S S Example 3 10 Genotypic identification of the R-genes in coupling phase. DNA was extracted and purified from the 48 F2 plants used in the leaf disc test, using standard available protocols. PCR based markers SCW09, CL922, SCV12, SCM05, 15 LR0029, LK0036, LR0096, and SCIll (Table 4) were amplified using the corresponding primers mentioned in Table 5. For markers SCW09, SCV12, SCM05, and SCI11 the amplifications were performed using a standard Taq DNA polymerase enzyme. For the markers LR0029, LR0096, LK0036, and CL922 hot-start 20 Taq with extra proof reading activity was used during the WO 2013/124310 PCT/EP2013/053367 30 amplification (e.g. Plantinum@ Taq polymerase, Invitrogen). The resulting PCR products were sequenced. The sequence results correspond exactly with the leaf disc test results. 34 Plants exhibited the haplotype 5 linked to Dm3, Dm6, and R18 in coupling phase, which means that for each of the resistant plants sequenced fragments corresponding to SEQ ID NO:1 to SEQ ID NO:8 were found (See Table 3). The 14 susceptible plants did not display this haplotype. 10 Table 3 Sequence data for the PCR based marker haplotype linked to the three R-genes in coupling phase for all F2 plants Plant Marker Marker Marker Marker Marker Marker Marker Marker nr. SCW09 CL922 SCV12 SCM05 LR0029 LK0036 LR0096 SCIll 1.01 SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID NO:1 NO:2 NO:3 NO:4 NO:5 NO:6 NO:7 NO:8 1.02 SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID NO:1 NO:2 NO:3 NO:4 NO:5 NO:6 NO:7 NO:8 1.03 SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID NO:1 NO:2 NO:3 NO:4 NO:5 NO:6 NO:7 NO:8 1.04 SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID NO:1 NO:2 NO:3 NO:4 NO:5 NO:6 NO:7 NO:8 1.05 SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID NO:1 NO:2 NO:3 NO:4 NO:5 NO:6 NO:7 NO:8 1.06 SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID NO:1 NO:2 NO:3 NO:4 NO:5 NO:6 NO:7 NO:8 1.07 Not Not Not Not Not Not Not Not found found found found found found found found 1.08 Not Not Not Not Not Not Not Not found found found found found found found found 1.09 SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID NO:1 NO:2 NO:3 NO:4 NO:5 NO:6 NO:7 NO:8 1.10 SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID NO:1 NO:2 NO:3 NO:4 NO:5 NO:6 NO:7 NO:8 1.11 SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID WO 2013/124310 PCT/EP2013/053367 31 NO:1 NO:2 NO:3 NO:4 NO:5 NO:6 NO:7 NO:8 1.12 Not Not Not Not Not Not Not Not found found found found found found found found 2.01 SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID NO:1 NO:2 NO:3 NO:4 NO:5 NO:6 NO:7 NO:8 2.02 Not Not Not Not Not Not Not Not found found found found found found found found 2.03 SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID NO:l NO:2 NO:3 NO:4 NO:5 NO:6 NO:7 NO:8 2.04 SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID NO:l NO:2 NO:3 NO:4 NO:5 NO:6 NO:7 NO:8 2.05 SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID NO:1 NO:2 NO:3 NO:4 NO:5 NO:6 NO:7 NO:8 2.06 Not Not Not Not Not Not Not Not found found found found found found found found 2.07 SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID NO:l NO:2 NO:3 NO:4 NO:5 NO:6 NO:7 NO:8 2.08 SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID NO:1 NO:2 NO:3 NO:4 NO:5 NO:6 NO:7 NO:8 2.09 SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID NO:l NO:2 NO:3 NO:4 NO:5 NO:6 NO:7 NO:8 2.10 SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID NO:l NO:2 NO:3 NO:4 NO:5 NO:6 NO:7 NO:8 2.11 SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID NO:1 NO:2 NO:3 NO:4 NO:5 NO:6 NO:7 NO:8 2.12 Not Not Not Not Not Not Not Not found found found found found found found found 3.01 SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID NO:1 NO:2 NO:3 NO:4 NO:5 NO:6 NO:7 NO:8 3.02 SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID NO:l NO:2 NO:3 NO:4 NO:5 NO:6 NO:7 NO:8 3.03 SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID NO:l NO:2 NO:3 NO:4 NO:5 NO:6 NO:7 NO:8 3.04 Not Not Not Not Not Not Not Not found found found found found found found found 3.05 SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID NO:l NO:2 NO:3 NO:4 NO:5 NO:6 NO:7 NO:8 3.06 Not Not Not Not Not Not Not Not found found found found found found found found WO 2013/124310 PCT/EP2013/053367 32 3.07 SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID NO:1 NO:2 NO:3 NO:4 NO:5 NO:6 NO:7 NO:8 3.08 SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID NO:1 NO:2 NO:3 NO:4 NO:5 NO:6 NO:7 NO:8 3.09 Not Not Not Not Not Not Not Not found found found found found found found found 3.10 SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID NO:1 NO:2 NO:3 NO:4 NO:5 NO:6 NO:7 NO:8 3.11 SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID NO:1 NO:2 NO:3 NO:4 NO:5 NO:6 NO:7 NO:8 3.12 Not Not Not Not Not Not Not Not found found found found found found found found 4.01 Not Not Not Not Not Not Not Not found found found found found found found found 4.02 Not Not Not Not Not Not Not Not found found found found found found found found 4.03 SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID NO:1 NO:2 NO:3 NO:4 NO:5 NO:6 NO:7 NO:8 4.04 Not Not Not Not Not Not Not Not found found found found found found found found 4.05 SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID NO:1 NO:2 NO:3 NO:4 NO:5 NO:6 NO:7 NO:8 4.06 SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID NO:1 NO:2 NO:3 NO:4 NO:5 NO:6 NO:7 NO:8 4.07 SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID NO:1 NO:2 NO:3 NO:4 NO:5 NO:6 NO:7 NO:8 4.08 SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID NO:1 NO:2 NO:3 NO:4 NO:5 NO:6 NO:7 NO:8 4.09 SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID NO:1 NO:2 NO:3 NO:4 NO:5 NO:6 NO:7 NO:8 4.10 SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID NO:1 NO:2 NO:3 NO:4 NO:5 NO:6 NO:7 NO:8 4.11 SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID SEQ ID NO:1 NO:2 NO:3 NO:4 NO:5 NO:6 NO:7 NO:8 4.12 Not Not Not Not Not Not Not Not found found found found found found found found WO 2013/124310 PCT/EP2013/053367 33 Table 4 Markers linked to Dm3, Dm6 and R18 when in coupling phase Name Sequence SCW09 AACAACGTAAATTTTCAAAAGAAAATTTTCATTTAAAATCATAT SEQ ID NO:1 AAATCCTCATGACACATTTTATTAAAATCTCATTTGCTCAATTC ACAAAACATAACTCCATGTTTTAGTAATTAAAAATCCAGGATCC TCATAACTCTTTCTCTGGTGTGTACAATCAACCGGTGCCGTCCT GCGATCCTGAGAACCTGAAACACATAACACATAACACGGTAAGC ACGAAGCTTAGTGAGTTCCCCAAGATACCACATAAAATACATAT TAGCCACTCGAGGCTATAACTCTATGGACCATCTGGTCCTAACT CTGTGGACCCTCTGGTCCTAACTTTGTGGACCTTTCGGTCCTAA TTCTGTAAACTCTGGAACACAAACACAACATAAATCACATAGAA ATAATGCAGTGCATCACATCACATAAATAGCATACAAAATACTC TGTCACATAACTCTGATTACCACTCTAGGTAAAGTATAGTGAGA AGACTCACTTGGCAAGCTGAAAGCAGCTATCCTTACACTTGAAT CTTGAACTCGCCACCGCCTAACACATAGGATGAACATCTCTTAT AATAACACTTTTTCACGACTCAGATAATCGAAGGCGGCTCCTTC TCTTTCTAACTCTCTAAAGTGGGTAAAAGACCATTTTACCCTTC CAAGGCCTCTATTACTTATGTTGACCAAAACCCCAAAGTCAACA AAAGTCAAGCTCAAGTCAACAGTCCACATTTGACCCTACTCGTC GAGTGCACCCATGCGACTCGTCGAGTCCCCTCGCATCAATTGAA CTCTACCTAGGACTCACTCAGATTGTCGAGTTGACTCCCAACTC GGCGAGCCAACACTAGGTTAAGA CL922 GGCCTATTTCGGTAGTTCCTGCACCACCACAACCACAGTTCATT SEQ ID NO:2 CAAGGTGGAGGTTCTGGAGCAAATGCAGGAGGGTAAATATTTGG TTAAGGTTAGTGCATGGGTTGTTAATTTTTGTTCTGGTAAATAA TGAAAAAAAAATTAAAAAAAATTCAATAATTTGTTTTTGTAGGT GTCCATAGATTGCAACATGATTATGAGCAACATTAGTGCTACTT GAGTGGCAGGGGCCTTTGATTTACCCTTGCAACCTATTCGCATT CTAGAGGTACCATTGCAACATGTTTCATGTAAACATTAACTTTT GTCTAATTTACATATTCGGTCCCTGTACTTAGCACCATTTGTTT
    CAAGATGTTAACCTTTGTAAAACAAGGGGCAAATAGTCATTTCT
    WO 2013/124310 PCT/EP2013/053367 34 AAGAATTTAAAAGCTTGAAACAGACTGTTAGGATCAAGACCAAA AGCATCATGGATAAAATAAATACCAAATTGTAAAATGGTTTTTT TTTTTGACTTAAAGAAAAAAATTACCTAAGCAAAAGGACCAACA TGTAATTTTGTCTAGTAAGGGTGAGTTCAAAACATAACCAAATT AGAGTAACTACTTTTAATTATTTGCGTTGTGTGGTTTTCTTAAT TATATAATTTAGAGTAACTACTTTTAACCTCATTCTAGTGCATA AATAAACCTGATGATACTTTTGTGATGCAGGTCATATACAATCA ATGCTCACCAGAGAAGTTATCTTCCGATTTGCTTCTAGTGACAG GAGAAGTGGCACCACTTGGCTT SCV12 ACCCCCCACTACCATATCAATCTCAGGTGCATTTTCATCATCAT SEQ ID NO:3 CAAGCATGGAAAATGCAAGGCATAGCATAAATTCAACAACGATA TCTTATCGTCTTCAACACATTATTCAGTGAGTTGAAATCCAAAA TCATCATGTAAGATGCGACTAACATAAAACATACACCCGATAAA TAGAAAAAAGGCAATGCTTACAACATATTGTCACAACCCAAAAC CAGACAACATGTCTCCAAAAGAAATTATACTTTTTGGGTATCAG ATAAGTGAAATCTTAAATTGAAGTGAAAAAGTTGCAGGACAAGT GGGGGGT SCM05 GGGAACGTGTTAATTAGAGATGTATTGTGCTATAGGGGGACTAC SEQ ID NO:4 AGTTCGGCAGATCGGGTGATTAGCGATTTCAGGTTTACGATTTA CCGAGACACACGAGGTGAGTCTTCTCACTATACTTTACCTTGAG TAGGTAACCAGAGTTATGTGATAGAGTACTTGTATGCTATGTAT GTCATGTGTTGTAOTGOATTATTTCTATGTGATTTATGTGGTGC ATGTTTATCAGAGCTAGAACCTGAGGGTTCACAGAGTTTGGGTG CACGGACCCACAGAGTTATAGTCTAGAGTGGCTAATATGTGTTA TATGTGGTATTTTGGGGAACTCACTAAGCCTTGTGCTTACAGTG TTGATGTTATTGTTTCAGGTACTAGTGACGACCGCGGGAAGGCG CCGGCTTGATCCATACACACACACGTTCCC LR0029 GAGTGTGATGGTATTGAAGAAGTTGTTTCAAACAGAGATGATGA SEQ ID NO:5 GGATGAAGA LK0036 GCAAAGGCTGAAAAAGGTTGTGAAAGAAAAGAAAATGTTTAATT SEQ ID NO:6 TTATTGTTGAGGCGGTTGTAGGGGAAAAAACAGACCCCATTGCT ATTCAATCAGCTGTGGCAGATTACCTAGGTATAGAGCTCAATGA
    AAAAACTAAACCAGCAAGAACTGAGAAGCTTCGTAAATGGTTTG
    WO 2013/124310 PCT/EP2013/053367 35 TGGACAATTCTGCTGGTAAGAAGATCCTAGTCATACTCGACGAT GTATGGCAGTTAGTTGACCTGA LR0096 AGACGATGTATGGCAACCAGTTGATTTGGAAGATATTGGTTTAA SEQ ID NO:7 GTCGTTTTCCAAATCAAGATGTTGACTTCAAGGTCTTGATTACA TCACGGGACCAATCAGTTTGCACTGAGATGGGAGTTAAAGCTGA TTTAGTTCTCAAGGTGAGTGTCCTGGAGGAAGTGGAAGCACACA GTTTGTTCCTCCAATTTTTAGAACCTTCTGATGATGTCGATCCT GAGCTCAATAAAATCGGAGAAGAAA SCIll ACTCCTTGACGAGTTACACGGAGCAACTATTTTTTCTAAGATAG SEQ ID NO:8 ATCTCTGATCCGGCTACCACCAAATAAGAGTATCAGAAAAAGAC GTTCATAAAACAGTGTTTCGCACATTCGACGACATTACGAGTTT CTCGTCATGCCATTTGGCCTCACAAACGCACCATCCACTTTTCA GTCCGCCATGAACGATCTCTTCAGACCCGCCCTTCAACGGTTCG TGTTAGTCTTCTTGGATGACATCCTAGTCTTCAGTCCTTCCTTG GATACTCATTATGAACACTTACGACTTGTTTTTCAAAGCTTACG GGATCACCAATTTCACACCAAACCATCCAAATGTATGTTTGCTA TGCATGAGGTCTCTTTGCTGGGACACAAAATTTCATCAACTGGA GTAGTACCAGAAGCAGACAATATACAAGTAATGTAACAATGGCC ACAACCCACATCCTTCACAACCTTTAGCGCTTACTTAGGATTGA CGGGATATTACCGTCGATTTGTTCCCCTCTACGCCAAAATTGCA GCACCTTTAACTAATATTCTTAAACTCAAATCTTTTGCGTGGAA TAACTCAGCATAGGAGGCGTTTGAACAACTTAAGACAACCATGC AAGACTTGGTGACGTTAGCCCTACCAGACTTCAACTCTCAATTT GATGTAAACATAGATGCTTCAGGAATGGCAATTGGAGTACTGTT ATCTCAAAACAACAGACCAATATCCTTTTTTATGTAACACCGGA AATTTTCAAACAAATTTTTCATTTTAAAATCATATAATTCTCGT AACACATTTCACAAAAATCTCACTGATTTAATTTACAAAACACA ACTTCATAATTGTTTTGATTCATACTCCAGGATCCTCAAAACAT AACTCTTGTTCTGGTGTGTACAATCAAGCCGGTGCCTTCCCGCG ATCCTGAGAAAACCTGAAACACATATCACATAACACGGTAAGCA CGAAGTTTAGTGAGTTCCCCAAAATACCACATACAACAAATTAG CCACTCGAGGCTATAACTCTGTAAGACCCTCCGGTCAATGTGTC
    TCAGTCAGACCCTCCAGTCCCACAACTCTGATGGACCCTCTGGT
    WO 2013/124310 PCT/EP2013/053367 36 CCTAACTCTGTGACCC Table 5 Primers for use in detecting the markers of Table 4 SCW09 forward primer GTGACCGAGTGTAACAACGTAAAT SEQ ID NO:9 SCW09 reverse primer GTGACCGAGTAGTCTTAACCTAGT SEQ ID NO:10 CL922 forward primer ATGCGGGTCAACAACAATA SEQ ID NO:11 CL922 reverse primer TGCCACTTCTCCTGTCACTA SEQ ID NO:12 SCV12 forward primer ACCCCCCACTACCATATCAATCTC SEQ ID NO:13 SCV12 reverse primer ACCCCCCACTTGTCCTGCAACTTT SEQ ID NO:14 SCM05 forward primer GGGAACGTGTTAATTAGAGATGTA SEQ ID NO:15 SCM05 reverse primer GGGAACGTGTGTGTGTATGGATCA SEQ ID NO:16 LR0029 forward primer GGAAGTGCAGCAACTGGAAT SEQ ID NO:17 LR0029 reverse primer AGGGAACAAAGTGGTGGTTG SEQ ID NO:18 LK0036 forward primer GCAAAGGCTGAAAAAGGTTG SEQ ID NO:19 LK0036 reverse primer TCAGGTCAACTAACTGCCATACA SEQ ID NO:20 LR0096 forward primer AGACGATGTATGGCAACCAG SEQ ID NO:21 LR0096 reverse primer TTTCTTCTCCGATTTTATTGAGC SEQ ID NO:22 SCI11 forward primer ACATGCCGTGTATTACTCAGAGTT WO 2013/124310 PCT/EP2013/053367 37 SEQ ID NO:23 SCIl1 reverse primer ACATGCCGTGACAGTATGAGACCG SEQ ID NO:24
    权利要求:
    Claims (16)
    [1] 1. A lettuce plant resistant to Bremia lactucae races Bl:1, Bl:4, Bl:5, Bl:6, Bl:7, Bl:10, Bl:12, Bl:13, Bl:14, 5 Bl:15, Bl:16, Bl:17, Bl:18, Bl:21, Bl:22, Bl:23, Bl:24, Bl:25 and Bl:28, which plant comprises a genetic determinant which causes the resistance and which genetic determinant is obtainable by introgression from a plant grown from seeds of which a representative sample was deposited under accession 10 number NCIMB 41761, and wherein the said genetic determinant in the seeds of seed deposit number NCIMB 41761 is at least linked to marker SCM05 with SEQ ID NO:4, marker LR0029 with SEQ ID NO:5, and marker LK0036 with SEQ ID NO:6, and optionally also to one or more of the markers selected from 15 the group consisting of marker SCW09 with SEQ ID NO:l, marker CL922 with SEQ ID NO:2, marker SCV12 with SEQ ID NO:3, marker LR0096 with SEQ ID NO:7, and marker SCIll with SEQ ID NO:8.
    [2] 2. A lettuce plant as claimed in claim 1, wherein the 20 genetic determinant comprises genes Dm3, Dm6 and R18 in coupling phase.
    [3] 3. A lettuce plant as claimed in claim 1 or 2, which plant is obtainable by crossing a lettuce plant grown from seeds of which a representative sample was deposited under 25 accession number NCIMB 41761, and selecting in the F2 progeny of the cross that is obtained after crossing the F1 with itself or with another plant for plants showing resistance against Bremia lactucae races Bl:1, Bl:4, Bl:5, Bl:6, Bl:7, B1:10, B1:12, B1:13, B1:14, B1:15, B1:16, B1:17, 30 B1:18, Bl:21, B1:22, B1:23, B1:24, B1:25 and B1:28.
    [4] 4. A lettuce plant as claimed in any one of the claims 1-3, which is also resistant to Bremia lactucae race B1:2 and/or root aphid (Pemphigus bursarius). WO 2013/124310 PCT/EP2013/053367 39
    [5] 5. Progeny of a lettuce plant as claimed in any one of the claims 1-4, wherein the progeny plant is resistant to Bremia lactucae races Bl:1, Bl:4, Bl:5, Bl:6, Bl:7, Bl:10, Bl:12, Bl:13, Bl:14, Bl:15, Bl:16, Bl:17, Bl:18, Bl:21, 5 Bl:22, Bl:23, Bl:24, Bl:25 and Bl:28.
    [6] 6. Seed of a lettuce plant as claimed in any one of the claims 1-5, wherein the plant that can be grown from the seed is resistant to Bremia lactucae races Bl:1, Bl:4, Bl:5, Bl:6, Bl:7, Bl:10, Bl:12, Bl:13, Bl:14, Bl:15, Bl:16, Bl:17, 10 Bl:18, Bl:21, Bl:22, Bl:23, Bl:24, Bl:25 and Bl:28.
    [7] 7. Propagation material capable of growing into a plant as claimed in any one of the claims 1-5.
    [8] 8. Propagation material as claimed in claim 7, wherein the propagation material is selected from the group 15 consisting of microspores, pollen, ovaries, ovules, embryos, embryo sacs, egg cells, cuttings, roots, root tips, hypocotyls, cotyledons, stems, leaves, flowers, anthers, seeds, meristematic cells, protoplasts, and cells.
    [9] 9. Tissue culture of propagation material as claimed 20 in claim 8 or 9.
    [10] 10. Head of a lettuce plant as claimed in any one of the claims 1-6.
    [11] 11. Food product, comprising the lettuce head of claim 10, or leaves, or parts thereof, optionally in 25 processed form.
    [12] 12. A nucleic acid molecule which is causative of resistance against Bremia lactucae races Bl:1, Bl:4, Bl:5, Bl:6, Bl:7, Bl:10, Bl:12, Bl:13, Bl:14, Bl:15, Bl:16, Bl:17, Bl:18, Bl:21, Bl:22, Bl:23, B1:24, Bl:25 and Bl:28 30 comprising a DNA sequence, which is positioned on chromosome 2 and linked to marker SCM05 with SEQ ID NO:4, marker LR0029 with SEQ ID NO:5 and marker LK0036 with SEQ ID NO:6, and preferably also to one or more of the markers selected from WO 2013/124310 PCT/EP2013/053367 40 the group consisting of marker SCW09 with SEQ ID NO:1, and marker CL922 with SEQ ID NO:2, and marker SCV12 with SEQ ID NO:3, and marker LR0096 with SEQ ID NO:7, and marker SCIll with SEQ ID NO:8. 5
    [13] 13. Nucleic acid molecule as claimed in claim 12, which comprises the genes Dm3, Dm6 and R18.
    [14] 14. Use of the markers as defined in claim 1, or use of the nucleic acid molecule as claimed in claim 12 or 13, to identify plants containing Bremia lactucae resistance 10 conferring genes Dm3, Dm6 and R18 in coupling phase.
    [15] 15. Use of the markers as claimed in claim 1, or use of the nucleic acid molecule as claimed in claim 13 or 14, to develop other markers linked to the Bremia lactucae resistance conferring genes Dm3, Dm6 and R18 in coupling 15 phase.
    [16] 16. A process for identifying lettuce plants comprising R-genes Dm3, Dm6 and R18 in coupling phase, comprising the step of selecting said lettuce plants from a population of lettuce plants segregating for these genes in 20 coupling phase using marker SCM05 with SEQ ID NO:4, and marker LR0029 with SEQ ID NO:5, and marker LK0036 with SEQ ID NO:6, and optionally also to one or more of the markers selected from the group consisting of marker SCW09 with SEQ ID NO:1, and marker CL922 with SEQ ID NO:2, and marker SCV12 25 with SEQ ID NO:3, and marker LR0096 with SEQ ID NO:7, and marker SCI11 with SEQ ID NO:8.
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    同族专利:
    公开号 | 公开日
    WO2013124310A1|2013-08-29|
    US20130269066A1|2013-10-10|
    AU2013224205B2|2018-09-20|
    US10273499B2|2019-04-30|
    EP2816891A1|2014-12-31|
    EP2628387A1|2013-08-21|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US5684226A|1994-01-06|1997-11-04|Harris Moran Seed Company|Multiple disease resistance in lettuce|
    US5973232A|1997-12-08|1999-10-26|Seminis Vegetable Seeds, Inc.|Lactuca sativa cultivar exhibiting resistance to downy mildew and corky root rot|
    US8772579B2|2009-03-06|2014-07-08|Rijk Zwaan Zaadteelt En Zaadhandel B.V.|Lettuce variety emerson|
    法律状态:
    2019-01-17| FGA| Letters patent sealed or granted (standard patent)|
    优先权:
    申请号 | 申请日 | 专利标题
    EP12156259.9A|EP2628387A1|2012-02-20|2012-02-20|Lettuce R-genes in coupling phase|
    EP12156259.9||2012-02-20||
    PCT/EP2013/053367|WO2013124310A1|2012-02-20|2013-02-20|R-genes in coupling phase|
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