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).
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Kumar, J., Kumar, A., Roy, J.K. et al. Identification and molecular characterization of begomovirus and associated satellite DNA molecules infecting Cyamopsis tetragonoloba . Virus Genes 41, 118–125 (2010). https://doi.org/10.1007/s11262-010-0482-7
- Cyamopsis tetragonoloba leaf curl virus
- Coat protein gene