Begomoviruses impose serious constraints on agriculture throughout the temperate, tropical and subtropical regions. Previously, we characterised a sida golden yellow vein virus isolate, SiGYVV-(JM:Lig2:08) (HQ009519-20) from a symptomatic Sida jamaicensis plant. With the aim of establishing whether it was hosting a mixed infection that could facilitate recombination, PCR-RFLP was done on DNA extracted from this plant, and the results suggested the presence of two additional genetically distinct DNA-A molecules. Sequence analysis of these two DNA-A molecules (relying on BLAST searches and the CLUSTAL V algorithm within the DNASTAR MegAlign module) revealed that they belonged to novel species, and we have tentatively named these viruses sida golden mosaic Braco virus-(Jamaica:Liguanea:2008) and sida golden mosaic Liguanea virus-(Jamaica:1:2008). Using RDP4 (recombination detection program), we determined that all three viruses were recombinant, with bases ~10 to ~440 of both SiGMLigV-(JM:Lig:08) and SiGYVV-(JM:Lig2:08) having been derived from a relative of SiGMBV-(JM:Lig:08) (P < 2.070 × 10 −7 for all seven of the recombination detection methods). SiGMBV-(JM:Lig:08) was itself a product of recombination, deriving bases ~490–1195 from a virus that was ~92 % similar to malvastrum yellow mosaic Helshire virus. Phylogenetically, these DNA-A components are most closely related to those of malvaceous weed-infecting begomoviruses from Jamaica, Cuba, Florida and Mexico. The SiGMBV DNA-A was able to elicit symptomatic infection in N. benthamiana.
Archives of Virology – Springer Journals
Published: Sep 1, 2014
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