The naturally occurring Grapevine fanleaf virus (GFLV) recombinant isolate A17b was recovered from its grapevine host by sap inoculation and serial passages onto Gomphrena globosa , a pseudo local lesion herbaceous host, and Chenopodium quinoa , a systemic herbaceous host, to characterize some of its biological properties. Sequence analysis of the CP gene, in which a recombinational event was previously detected, demonstrated the genetic stability of recombinant isolate A17b over a 5-year period in its natural host as well as in C. quinoa . Also, recombinant isolate A17b was graft transmissible, as shown by an in vitro heterologous approach, and transmitted by the nematode Xiphinema index as readily as nonrecombinant GFLV isolates. Furthermore, despite a lower pathogenicity on Chenopodium amaranticolor , recombinant isolate A17b had a similar host range and induced similar symptoms in type and severity to nonrecombinant GFLV isolates. Interestingly, the use of infectious chimeric RNA2 transcripts in combination to RNA1 transcripts of GFLV strain F13 suggested no implication of the recombination event in the CP gene of isolate A17b in the reduced pathogenicity on C. amaranticolor . Altogether, recombinant isolate A17b had similar biological properties to GFLV nonrecombinant isolates.
Archives of Virology – Springer Journals
Published: Nov 1, 2005
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