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Poster: Biology & Disease Mgmt: Genetics of Resistance


Resistance in pea to the Bean leaf roll virus
L. PORTER (1), L. Porter (2) (1) USDA ARS, U.S.A.; (2) USDA-ARS, U.S.A.

Bean leaf roll virus (BLRV) is a major luteovirus impacting dry pea production on an annual basis in Idaho and Washington. Symptomatic plants are often chlorotic, stunted and distorted. The virus is transmitted by aphids in a persistent manner and cannot be mechanically transmitted. Host resistance is an important economic and environmentally favorable means to manage this pathogen. Pea aphids were used to phenotype the genetic resistance of 36 pea genotypes, mostly consisting of dry pea cultivars, under controlled greenhouse conditions. Two pea genotypes, Journey and Stirling, were determined to have complete resistance to BLRV. Journey is a commercial forage green dry pea and Stirling is a formerly grown commercial green dry pea. Three commercial pea cultivars, Majoret, Granger and Spector were determined to be highly susceptible to BLRV with a 100% incidence of infection across three tests. Mapping populations will be established between the resistant and susceptible pea genotypes to identify molecular markers that can be used in marker-assisted selection of pea germplasm for genetic resistance to BLRV.