Downy mildew resistant lettuce plants
First Claim
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1. An elite lettuce plant comprising an introgression from Lactuca virosa on chromosome 7, wherein said introgression comprises a single gene conferring improved resistance to Bremia lactucae relative to a plant lacking said introgression, wherein said plant comprises a Lactuca virosa allele at locus NLSAT009419770 (SEQ ID NO:
- 6) and a Lactuca sativa allele at locus NLSAT005132975 (SEQ ID NO;
1), and wherein a representative sample of seed comprising said introgression was deposited under ATCC Accession Number PTA-121598.
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Abstract
The present disclosure provides lettuce plants exhibiting resistance to downy mildew. Such plants may comprise novel introgressed genomic regions associated with disease resistance from L. virosa. In certain aspects, compositions, including novel polymorphic markers and methods for producing, breeding, identifying, and selecting plants or germplasm with a disease resistance phenotype are provided.
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Citations
31 Claims
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1. An elite lettuce plant comprising an introgression from Lactuca virosa on chromosome 7, wherein said introgression comprises a single gene conferring improved resistance to Bremia lactucae relative to a plant lacking said introgression, wherein said plant comprises a Lactuca virosa allele at locus NLSAT009419770 (SEQ ID NO:
- 6) and a Lactuca sativa allele at locus NLSAT005132975 (SEQ ID NO;
1), and wherein a representative sample of seed comprising said introgression was deposited under ATCC Accession Number PTA-121598. - View Dependent Claims (4, 5, 6, 7)
- 6) and a Lactuca sativa allele at locus NLSAT005132975 (SEQ ID NO;
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2. An elite lettuce plant comprising an introgression from Lactuca virosa on chromosome 7, wherein said introgression comprises a Lactuca virosa allele at locus NLSAT009419770 (SEQ ID NO:
- 6) and a Lactuca sativa allele at locus NLSAT005132975 (SEQ ID NO;
1), wherein the Lactuca virosa allele confers improved resistance to Bremia lactucae relative to a plant lacking said introgression, and wherein said introgression lacks an allele genetically linked to said Lactuca virosa allele conferring stunted growth. - View Dependent Claims (3, 8, 9, 10, 11, 12, 13, 14, 15, 16)
- 6) and a Lactuca sativa allele at locus NLSAT005132975 (SEQ ID NO;
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17. A method for obtaining an elite lettuce plant exhibiting improved resistance to Bremia lactucae, comprising:
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a) obtaining an elite lettuce plant heterozygous for a first allele from Lactuca virosa that confers quantitative resistance to Bremia lactucae and that is genetically linked in the plant to a second allele from Lactuca virosa that confers stunted growth, wherein the plant is heterozygous relative to a corresponding locus in said elite plant; (b) obtaining progeny of the plant; and (c) selecting at least a first progeny plant in which recombination has occurred such that the progeny plant comprises said allele from Lactuca virosa at locus NLSAT009419770 (SEQ ID NO;
6) and a Lactuca sativa allele at locus NLSAT005132975 (SEQ ID NO;
1), wherein the Lactuca virosa allele confers said resistance to Bremia lactucae and wherein said progeny plant lacks said second allele from Lactuca virosa that confers stunted growth. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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- 24. A lettuce plant comprising an introgression from Lactuca virosa on chromosome 7, wherein said introgression comprises a single gene conferring improved resistance to Bremia lactucae relative to a plant lacking said introgression and wherein a sample of seed comprising said introgression was deposited under ATCC Accession Number PTA-121598.
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