Abstract
Potyvirus isolates were obtained in Taiwan from soybean showing crinkle, mottle, mosaic or blistering. They were identified as peanut stripe virus (PStV) on the basis of host range, serology, molecular weight of the capsid proteins and morphology of cytoplasmic cylindrical inclusions. PStV was found to be closely related serologically to adzuki bean mosaic virus (AzMV), blackeye cowpea mosaic virus (BICMV), and the bean common mosaic virus (BCMV) strain NY 15. A clear differentiation of PStV from these related viruses was possible on the basis of the cylindrical inclusion morphology. Only the peanut isolate of PStV from the USA and the three soybean isolates of PStV from Taiwan produced pinwheels, scrolls and curved laminated aggregates whereas the other serologically related viruses produced scrolls only. Whilst the peanut isolate of PStV infected all nine peanut cvs tested, the soybean isolate PN of PStV infected two peanut cvs only. AzMV, BICMV and two strains of soybean mosaic virus did not infect any of the peanut cultivars tested. On the other hand, nineteen and three of the 27 soybean cvs were susceptible to the soybean isolate PN and the peanut isolate of PStV, respectively. The capsid proteins of the peanut and the three soybean isolates of PStV and of AzMV appeared to be proteolytically undegraded and to have nearly identical molecular weights of 35 kD. Based upon results of virus surveys in soybean plantings in Taiwan, the incidence of soybean isolates of PStV in soybean is similar to that of soybean mosaic virus, suggesting that these PStV strains might be economically significant to soybean production m Taiwan.
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