The presence of rugose-wood-associated viruses of the genera Foveavirus and Vitivirus in the family Betaflexiviridae was investigated in various clones of own-rooted and grafted Vitis vinifera cv. Shiraz that were affected, or not, by Shiraz decline, and in rootstocks. RT nested-PCR amplification of double-stranded RNA using degenerate primers for the simultaneous detection of foveaviruses and vitiviruses (Dovas CI, Katis NI in J Virol Meth 170:99–106, 2003), cloning of DNA amplicons, SSCP analysis of clones, sequencing and computer-assisted analysis of sequences was used to characterize viral genetic variability. A total of 1,137 clones were analysed by SSCP, and, of those, 371 clones were sequenced. The results revealed that variants of five molecular groups belonging to the species Grapevine rupestris stem pitting - associated virus (GRSPaV), including highly divergent variants related to strain SY (Lima MF et al. in Arch Virol 151:1889–1894, 2006) were present in plants of various clones of Shiraz regardless of their Shiraz decline status, and in rootstocks. Grapevine virus A (GVA) and grapevine virus B (GVB) were detected in a relatively small number of plants. This study suggested no involvement of GRSPaV, GVA or GVB in Shiraz decline.
Archives of Virology – Springer Journals
Published: Sep 1, 2010
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