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A Sap-transmissible, Defective Form of Tomato Spotted Wilt Virus

Department of Virology, Agricultural University, P.O. Box 8045, 6700 EM Wageningen, The Netherlands

After multiple sap transmissions two isolates of tomato spotted wilt virus (TSWV) lost the characteristic particles, and amorphous, more or less diffuse masses were observed in the cytoplasm of cells. The amorphous material, which had previously been described associated with normal virus particles, could also be found in pellets from extracts of infected plants. Isolates of the ‘amorphous’ type had the same thermal inactivation point as those of the normal ‘particulate’ type. It is suggested that the ‘amorphous’ type is a defective form of TSWV.

Keywords: TSWV, ultrastructure, defective form, sap transmissibility

Received 3 August 1981; accepted 3 December 1981.