Description

Abstract: One hundred twenty-one soybean genotypes from the International Soybean Program coElection sere 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 imrnunosorbent 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 Myzuspersicae but inefficiently [I%) by Aphis craccivorn. None of the three virus isolates were transmitted in the 15.000 soybean seeds from infected plants harvested fromall susceptiblecultivars, Infective particles could be recovered from seed coats of immature seeds by bioassay on Chenopodium urnarunticolor. Although low ELISA values were obtained from the seed coats of mature seed, infective particles could not be recovered by biaassay. Neither infective virus nor serologically detectable PStV was recovered from cotyledons or embryo axes of mature seeds.