VIEW ARTICLE

Inheritance of Resistance to Watermelon Mosaic Virus 2 in Phaseolus vulgaris. R. Provvidenti, Department of Plant Pathology, New York State Agricultural Experiment Station, Cornell University, Geneva, New York 14456; Phytopathology 64:1448-1450. Accepted for publication 5 June 1974. DOI: 10.1094/Phyto-64-1448.

Resistance to watermelon mosaic virus 2 (WMV-2) was found to be widespread in Phaseolus vulgaris. Of 280 bean accessions tested, 229 were resistant, 22 developed a local reaction, 21 were systemically infected (susceptible), and 8 were heterogeneous populations. Among resistant lines, a few responded with a severe necrotic hypersensitive reaction when graft-inoculated, or when mechanically inoculated and incubated at 35 C. In F₁, F₂, and reciprocal F₁ backcross progenies of resistant × susceptible and hypersensitive-resistant × susceptible lines, resistance was monogenically dominant. On susceptible genotypes, foliar and pod symptoms incited by WMV-2 were similar to those caused by some strains of bean yellow mosaic virus.