Abstract
Begomovirus associated tomato leaf curl disease (ToLCD) is one of the major limiting factors in production of tomato worldwide, including India. In contrast to extensive diversity of ToLCD associated begomovirus species in the mainland India, information on begomovirus species circulating in the Northeastern part of India (NE India) is extremely scanty. This study, for the first time, demonstrate a novel begomovirus disease complex comprising of tobacco curly shoot virus (TbCSV) along with non-cognate betasatellite (tomato leaf curl virus associated betasatellite, ToLCB) to cause severe ToLCD in this region of NE India. Phylogenetically, the TbCSV sequences showed close relatedness to TbCSV sequences from Bangladesh and West Bengal, India, as compared to sequences from China. Furthermore, this begomovirus disease complex was found to be markedly distinct from another disease complex (comprising of tomato leaf curl Bangladesh virus, ToLCBV and a cognate betasatellite) infecting Gomphostemma plants growing in adjacent plots. Thus, besides providing important information on distinctive molecular epidemiology of ToLCD associated Begomovirus in NE India, this study also reveal and discuss some interesting facets of begomovirus ecology.
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