Identification and molecular characterization of begomovirus and associated satellite DNA molecules infecting Cyamopsis tetragonoloba

J. Kumar, A. Kumar, J. K. Roy, R. Tuli, J. A. Khan

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

Monopartite begomoviruses comprise DNA-A as the main genome and associated satellite DNAs. Viral DNA extracted from guar (Cyamopsis tetragonoloba) showing leaf curl symptoms exhibited positive amplification of coat protein (CP) gene of DNA-A component, suggesting the presence of begomovirus. Full length DNA-A was amplified by primer pair re-designed from CP gene nucleotide sequence. The associated alphasatellite and betasatellite DNA molecules were amplified and sequenced, confirming the presence of monopartite begomovirus. Sequence comparisons showed 89% identity with other begomoviruses. The Neighbor-Joining tree based on full length DNA-A nucleotide sequence showed that the guar infecting begomovirus clustered separately from other known begomoviruses. The betasatellite shared a high (96%) nucleotide identity to Cotton leaf curl Multan betasatellites. The alphasatellite showed 91% nucleotide identity to alphasatellite associated with begomovirus infecting Okra. Recombination analyses showed three recombinant fragments in DNA-A, two in betasatellite, and four in alphasatellite. The results suggest that the begomovirus identified in this study was a new recombinant virus. Its name was proposed as Cyamopsis tetragonoloba leaf curl virus (CyTLCuV).

Original languageEnglish (US)
Pages (from-to)118-125
Number of pages8
JournalVirus Genes
Volume41
Issue number1
DOIs
StatePublished - Aug 1 2010

Keywords

  • Alphasatellite
  • Begomovirus
  • Betasatellite
  • Coat protein gene
  • Cyamopsis tetragonoloba leaf curl virus
  • DNA-A

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