title: Biological and molecular characterization of a begomovirus associated with yellow mosaic vein mosaic disease of pumpkin from Northern India.
abstract: The biological and molecular properties of Squash leaf curl China virus from Varanasi, India (SLCCNV-IN[IN:Var:Pum]) were characterized. SLCCNV-IN[IN:Var:Pum] could be transmitted by grafting and through whitefly transmission. The complete DNA-A and DNA-B components were amplified through PCR using specific DNA-A and DNA-B primers. The DNA-A of the isolate was comprised of 2,738 nucleotides, encoding typical six open reading frames, and DNA-B of 2,704 nucleotides, encoding two ORFs. Genome organization of the isolate was typical of an old world bipartite begomovirus. Comparisons showed that DNA-A and its intergenic region have the highest sequence identity (97.6 and 97.4%, respectively) with the SLCCNV-IN[IN:Luc:Pum]; (DQ026296). This data suggested that the isolate is a same begomovirus species for which the name Squash leaf curl China virus-India[India:Varanasi:Pumpkin] is proposed. DNA-B showed maximum sequence identity (89.2%) with SLCCNV-IN[IN:Coi:Pum] (AY184488). Phylogenetic analysis of the present isolate showed close relationship to other cucurbit-infecting geminiviruses. This is the first evidence of occurrence of the bipartite Squash leaf curl China virus associated with severe yellow mosaic disease of pumpkin in northern India.
authors.affiliation: Molecular Virology Laboratory, School of Life Sciences, Jawaharlal Nehru University, New Delhi, India.
authors.forename: A K
authors.initials: AK
authors.lastname: Singh
authors.forename: K K
authors.initials: KK
authors.lastname: Mishra
authors.forename: B
authors.initials: B
authors.lastname: Chattopadhyay
authors.forename: S
authors.initials: S
authors.lastname: Chakraborty
mesh_terms: D001483:Base Sequence; D053839:Begomovirus / Q000235:genetics* / Q000302:isolation & purification / Q000472:pathogenicity*; D028464:Cucurbita / Q000821:virology*; D004279:DNA, Viral / Q000737:chemistry / Q000235:genetics; D023061:Gene Order; D016679:Genome, Viral; D007194:India; D008969:Molecular Sequence Data; D016366:Open Reading Frames; D010802:Phylogeny; D010935:Plant Diseases / Q000821:virology*; D016133:Polymerase Chain Reaction; D017422:Sequence Analysis, DNA; D017385:Sequence Homology; D026801:Synteny
chemical_list: D004279:DNA, Viral
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