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Virus-like Particles in Tomato Plants Affected by the Yellow Leaf Curl Disease

Istituto di Patologia vegetale, Università degli Studi, 70126 Bari, Italy
¹ Agricultural Research Organization, The Volcani Center, Bet Dagan, Israel

The ultrastructural changes of phloem parenchyma cells of tomato plants affected by yellow leaf curl disease are described. The nuclei were severely altered, the chromatin was reduced to a few peripheral clumps and the nucleoplasm contained ring-like electron opaque structures and massive aggregates of virus-like particles. These particles were rounded, measured 15 to 17 nm in diam. and occasionally appeared to occur in pairs. Based on these findings, the presence of a geminivirus in the tomato tissues examined is inferred.

Received 16 November 1979; accepted 15 January 1980.