Abstract
Geminiviruses are transmitted by whiteflies, leafhoppers, or treehoppers. The whitefly speciesBemisia tabaci(Gennadius) is the most efficient vector of Subgroup III geminiviruses. An isolate of Abutilon mosaic virus (AbMV), a bipartite geminivirus, was not detectable in the DNA extract from insects by Southern blot analysis, nor was the isolate transmissible by the B-biotype ofB. tabaci,although the virus DNA was amplified (by PCR) from some insects. In contrast, Sida golden mosaic virus (SiGMV-Co), a closely related geminivirus, was acquired and transmitted byB. tabacito various host plants. The coat protein of AbMV was replaced with that of SiGMV-Co. The resulting chimeric AbMV was acquired and transmitted to various host plants byB. tabaci, indicating that the coat protein plays an essential role in the transmission process byB. tabaci.
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