Extreme-phenotype genome-wide association study (XP-GWAS) of powdery mildew race 2 W tolerance in the USDA Citrullus germplasm collection.

ABSTRACT: Powdery mildew outbreaks, caused by Podosphaera xanthii, cause reduced watermelon yields as the plants produce fewer and smaller fruits due to premature leaf senescence. The reduced leaf canopy can decrease fruit quality due to sun scalding. Sources of powdery mildew tolerance were previously identified by screening the USDA Citrullus germplasm collection with P. xanthii races 1 W and 2 W. However, not all gene loci associated with tolerance to race 2 W have been identified and markers tightly linked to such loci have not been developed. We employed a bulked segregant analysis approach using historical data from the USDA Germplasm Resource Information Network for an extreme-phenotype genome-wide association study (XP-GWAS) of tolerance to P. xanthii race 2 W in Citrullus accessions (N = 1,

SUBMITTER: Branham SE 

PROVIDER: S-EPMC11807107 | biostudies-literature | 2025 Feb

REPOSITORIES: biostudies-literature