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Inheritance of resistance to sunflower downy mildew races 1, 2 and 3 in cultivated sunflower
Author(s) -
Rahim M.,
Jan C. C.,
Gulya T. J.
Publication year - 2002
Publication title -
plant breeding
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.583
H-Index - 71
eISSN - 1439-0523
pISSN - 0179-9541
DOI - 10.1046/j.1439-0523.2002.00680.x
Subject(s) - downy mildew , biology , genetics , sunflower , gene , race (biology) , allele , botany , horticulture
Sunflower downy mildew (SDM) caused by Plasmopara halstedii , is a major disease of sunflower. Eleven resistance genes have been identified, but allelic relationships among these genes are not clear. This study examined the inheritance and allelic relationships of genes conferring resistance to SDM races 1, 2 and 3 (virulence phenotypes 100, 300 and 700, respectively) and confirmed a twelfth resistance gene. Three USDA Plant Introductions, AMES 3235, PI 497250, and PI 497938, and three released lines, RHA 266, RHA 274 and DM‐2 were studied. RHA 266 has only the Pl 1 gene for race 1 resistance. Digenic inheritance of resistance was found in AMES 3235, PI 497250, and RHA 274. These lines have the Pl 1 and Pl 12 genes, conferring resistance to race 1, and the Pl 2 and Pl 11 genes, conferring resistance to race 2. DM‐2 and PI 497938 have Pl 12 (but not Pl 1 for resistance to race 1, the Pl 12 gene (but not the Pl 2 ) for resistance to race 2, and Pl 5 for resistance to race 3. These resistance genes will serve as a foundation for future gene designations and genetic diversity studies of resistance to SDM.