Susceptibility and Resistance of Soybeans to Peanut Stripe Virus. Dulce Warwick, Former Graduate Student, Department of Plant Pathology, Georgia Experiment Station, Experiment 30212. J. W. Demski, Professor, Department of Plant Pathology, Georgia Experiment Station, Experiment 30212.. Plant Dis. 72:19-21. Accepted for publication 17 September 1987. Copyright 1988 The American Phytopathological Society. DOI: 10.1094/PD-72-0019.

One hundred twenty-one soybean genotypes from the International Soybean Program collection were evaluated for their reactions to three symptom variants (isolates) of peanut stripe virus (PStV): stripe, blotch, and mild mottle. Symptoms on soybeans ranged from systemic necrosis, mosaic, and mild mottle to no reaction. About 35% of the genotypes are resistant to all isolates. Enzyme-linked immunosorbent assay (ELISA) readings were positive from susceptible genotypes showing symptoms but not from resistant genotypes without symptoms. PStV was transmitted efficiently (16%) from peanut to soybean by the aphid Myzus persicae but inefficiently (1%) by Aphis craccivora. None of the three virus isolates were transmitted in the 15,000 soybean seeds from infected plants harvested from all susceptible cultivars. Infective particles could be recovered from seed coats of immature seeds by bioassay on Chenopodium amaranticolor. Although low ELISA values were obtained from the seed coats of mature seed, infective particles could not be recovered by bioassay. Neither infective virus nor serologically detectable PStV was recovered from cotyledons or embryo axes of mature seeds.

Keyword(s):