Transmission Characteristics and Cytopathology of a White fly-Transmitted Virus Isolated from Sweet Potato Leaf Curl Disease

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Abstract

A leaf curl disease of sweet potato was found occasionally in field sweet potato crop in Osaka. Symptoms of this disease, including upward leaf curl and stunting, occurred in young plants in the spring which remained almost symptomless at other times of the growing season. The virus, which had an apparently narrow host range within the family Convolvulaceae, had several characteristics in common with sweet potato leaf curl virus (SPLCV) previously described by Shinkai (1983). The virus was transmitted by a whitefly (Bemisia tabaci), but not by aphids or mechanically. In virus-vector relationships, the minimum acqusition-access period and inoculation-access period were 1h and 30 minutes, respectively. A latent period of 21-24h was demonstrated. The virus was retained by its white fly vector for 10 days. Electron microscopic observations of thin sections from infected sweet potato, Ipomoea setosa and Pharbitis nil leaves indicated that geminivirus like particles, approximately 16nm in diameter, were located in the nuclei of phloem parenchymal cells. The cytopathic effects typically observed in geminivirus infected dicotyledonous plants were noted in nuclei in phloem associated cells of SPLCV infected plants. These data suggest that SPLCV may belong to the subgroup B in geminivirus group.

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