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Title: Molecular phylogenetic analysis of Indian strains of Helicoverpa armigera nucleopolyhedrovirus (HearNPV)
Authors: Kaur, Baljeet
Gupta, V K
Jindal, Vikas
Keywords: Gene sequences;Indian HearNPV;lef-8;Phylogenetic analysis;Polh
Issue Date: Apr-2014
Publisher: NISCAIR-CSIR, India
Abstract: In order to determine the phylogenetic relation amongst four Helicoverpa armigera nucleopolyhedrovirus (HearNPV) strains, isolated from North Indian states along with standard Bangalore strain, a molecular analysis was performed based on conserved polh (polhedrin) and lef-8 (late expression factor-8) gene sequences of these strains. PCR amplification of polh region only with HearSNPV and not with HearMNPV specific primers established that all strains were single nucleopolyhedrovirus (SNPV) and none were multiple nucleopolyhedrovirus (MNPV). Multiple alignments of polh and lef-8 sequences with similar sequences available for HearSNPV strains from other countries identified several nucleotide mutations (addition and substitution) amongst these strains, some of which were equally reflected into variability in amino acid sequences. The phylogenetic analysis based on both individual (polh and lef-8) as well as concatenated (polh-lef-8) sequences established a phylogenetically distinct identity of Indian HearSNPV strains, which were different from HearSNPV strains reported from other countries. Moreover, Indian HearSNPV strains possessed a low to high genetic variability amongst themselves suggesting that these strains have evolved through a common ancestor due to geographical separation. Though the Indian strains constituted a distinct cluster in HearSNPV phylogeny, the observed genotypic variability requires investigations on these genotypic differences in the biology of baculoviruses. The results hold significance in molecular fingerprinting of Indian HearNPV strains, and the same will help in understanding the ecology and evolution of these strains in the Indian subcontinent.
Page(s): 186-194
ISSN: 0975-0967 (Online); 0972-5849 (Print)
Appears in Collections:IJBT Vol.13(2) [April 2014]

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