We have investigated the ability of satellite DNA β to complement mutations in the CP, V2 and C4 genes of the monopartite begomovirus, tomato leaf curl virus, which are potentially involved in movement. A mutation in the coat protein was not complemented by DNA β. Mutations of the C4 and V2 genes attenuated and abolished symptoms, respectively. In the presence of the C4 mutant, but not the V2 mutant, DNA β induced typical symptoms, confirming that the satellite encodes a dominant symptom determinant. In contrast to the C4 mutant, DNA β did not enhance the viral DNA levels of the V2 mutant, suggesting that V2 is required for this phenomenon. The significance of these findings is discussed based on our present understanding of the functions of the viral genes and DNA β.
Archives of Virology – Springer Journals
Published: Jul 1, 2008
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