Inheritance of resistance to peanut mottle virus in Phaseolus vulgaris

Abstract

Abstract One-hundred-and-eleven bean (Phaseolus vulgaris) cultivars of domestic and foreign origin reacted identically to the N and the M strains of peanut mottle virus (PMV). Seventy-eight cultivars (70 percent) developed chlorotic or necrotlc local lesions, without systemic infection (resistant). Thirty cultivars (27 percent) were infected with local chlorotic or necrotic lesions followed by systemic necrosis and death (susceptible). Three cultivars (3 percent) yielded resistant and susceptible plants (heterogeneous populations). In F1, F2, and reciprocal backcross populations derived from crosses between PMV-resistant and -susceptible selections of the cultivar Royalty Purple Pod, resistance to the N strain was conferred by a single, but incompletely dominant gene, designated Pmv. No seed transmission of PMV could be demonstrated in progenies of susceptible cultivars because of premature death. The virus was not transmitted in seed of F2 Intermediate resistant plants.