Linkage analysis of genes for resistance to downy mildew (Bremia lactucae) in lettuce (Lactuca sativa)

S. H. Hulbert; Richard W Michelmore

doi:10.1007/BF00305985

Linkage analysis of genes for resistance to downy mildew (Bremia lactucae) in lettuce (Lactuca sativa)

S. H. Hulbert, Richard W Michelmore

Medical Microbiology and Immunology

Research output: Contribution to journal › Article › peer-review

56 Scopus citations

Abstract

The genetics of specific resistance was studied in F₂ populations which segregated for either one or two resistance genes. The resistance factors 1, 11 and 14 which had not previously been characterized genetically segregated as single dominant genes (Dm). Resistance was determined by three linkage groups; R 1/14, 2, 3, and 6 in the first, R 5/8, and 10 in the second and R 4, 7 and 11 in the third. Cultivars of lettuce commonly used in the differential series to detect virulence to R3 and R10, were demonstrated to carry two tightly linked resistance genes. Implications of this linkage arrangement to the manipulation and characterization of these resistance genes are discussed.

Original language	English (US)
Pages (from-to)	520-528
Number of pages	9
Journal	Theoretical And Applied Genetics
Volume	70
Issue number	5
DOIs	https://doi.org/10.1007/BF00305985
State	Published - Aug 1985

Keywords

Host/parasite interaction
Specific resistance

ASJC Scopus subject areas

Genetics(clinical)
Genetics
Plant Science
Horticulture
Agronomy and Crop Science

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abstract = "The genetics of specific resistance was studied in F2 populations which segregated for either one or two resistance genes. The resistance factors 1, 11 and 14 which had not previously been characterized genetically segregated as single dominant genes (Dm). Resistance was determined by three linkage groups; R 1/14, 2, 3, and 6 in the first, R 5/8, and 10 in the second and R 4, 7 and 11 in the third. Cultivars of lettuce commonly used in the differential series to detect virulence to R3 and R10, were demonstrated to carry two tightly linked resistance genes. Implications of this linkage arrangement to the manipulation and characterization of these resistance genes are discussed.",

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AB - The genetics of specific resistance was studied in F2 populations which segregated for either one or two resistance genes. The resistance factors 1, 11 and 14 which had not previously been characterized genetically segregated as single dominant genes (Dm). Resistance was determined by three linkage groups; R 1/14, 2, 3, and 6 in the first, R 5/8, and 10 in the second and R 4, 7 and 11 in the third. Cultivars of lettuce commonly used in the differential series to detect virulence to R3 and R10, were demonstrated to carry two tightly linked resistance genes. Implications of this linkage arrangement to the manipulation and characterization of these resistance genes are discussed.

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