Analyses of 3' half genome of citrus tristeza virus reveal existence of distinct virus genotypes in citrus growing regions of India

Virusdisease
K K BiswasManjunath L Keremane

Abstract

Citrus tristeza virus (CTV, genus Closterovirus) is one of the most serious pathogens responsible for huge loss of citrus trees worldwide. Four Indian CTV isolates, Kat1 (C. reticulata/Central India), D1 (C. sinensis/North India), B5 (Citrus limettoides/South India) and G28 (C. lemon/Northeast India) collected from different regions of India were characterized based on sequencing of 3' half genome (~ 8.4 kb) comprising 10 open reading frames (ORFs2-11) and 3' UTR and the sequences were submitted to NCBI database as Acc. No KJ914662, HQ912022, HQ912023 and KJ914661, respectively. The present and previously reported Indian isolates Kpg3 and B165 were analyzed and compared with other Asian and international CTV isolates. The Indian CTV isolates had 92-99% nt identities among them. The phylogenetic analysis generated overall ten genogroups/lineages. Of them, all the Asian isolates fell into seven genogroups, whereas the Indian isolates into four. Indian isolates Kat1, D1 and Kpg3 grouped together, termed "Kpg3Gr", along with Florida severe isolate T3. The Indian isolates B5, and G28 were found to be two distinct and separate lineages, indicating that these isolates are two new CTV entities. Based on phylogenetic analysis, Kpg3Gr wa...Continue Reading

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Datasets Mentioned

BETA
EU076703
Other

Methods Mentioned

BETA
PCR

Software Mentioned

Geneconv
RDP4 )
MEGA
BootScan
ORF finder
DNA STAR
SeqMan
Sequence Demarcation Tool ( SDT )
Chimera
MEGA6

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