Genome-wide association study for morphological traits and resistance to Peryonella pinodes in the USDA pea single-plant plus collection.
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Abstract Peas (Pisum sativum) are the second most cultivated pulse crop in the world. They can serve as human food, fodder, and cover crop. The most serious foliar disease of pea cultivars worldwide is Ascochyta blight, which can be caused by several pathogens. Of these, Peyronella pinodes is the most aggressive and prevalent worldwide. Several traits, including resistance to Peyronella pinodes, stem diameter, internode length between nodes 2-3 and 5-6, and area of 7th leaf were measured in 269 entries of the Pea Single Plant Plus Collection (SPPC). The heritability (H2) of the morphological traits was relatively high, while disease resistance had low heritability. Using 53,196 single nucleotide polymorphism (SNPs) markers to perform a genome-wide association study to identify genomic loci associated with variation in all the traits measured, we identified 27 trait-locus associations, 5 of which were associated with more than one trait. Features
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