Tomato Yellow Leaf Curl Virus DNA Forms in the Viral Capside, in Infected Plants and in the Insect Vector

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Abstract
Tomato yellow leaf curl virus (TYLCV) DNA was used as a probe to identify and analyze virus‐related DNAs in the viral capside, in infected tomato plants and in the virus vector, the whitefly. In addition to the single‐stranded viral genomic DNA, double‐stranded virus‐related DNA molecules were detected in infected plants. Not all of the virus‐related DNA forms are present simultaneously in the infected plant. The double‐stranded molecules, which are probably the replicative form of the viral genome, have been purified from an infected tomato plant. In the viruliferous whitefly, only the single‐stranded unit‐size viral genome was detected.