A natural serological variant of Grapevine fanleaf virus.

Abstract

Summary. A virus isolated by mechanical inoculation from a Tunisian vine with fanleaf symptoms was compared serologically and ultrastructurally with ordinary isolates of Grapevine fanleaf (GFV) and Arabis mosaic (ArMV) viruses. The Tunisian virus was serologically related to but distinguishable from both viruses. However, since it was more closely related to GFV and showed an intracellular behaviour akin that of GFV, it was identified as a strain of the latter virus. This appears to be the first record of a clear-cut serological variant of GFV. Riassunto. Una variante sierologicia naturale del virus dell'arricciamento della vite. Un virus isolato meccanicamente da una Vite tunisina con sintomi di arricciamento e stato paragonato sierologicamente ed ultrastrutturalmente con isolati comuni del virus dell'arricciamento della Vite (GFV) e del mosaico dell'Arabis (ArMV). Il virus tunisino e risultato essere sierologicamente correlato ma distinguibile da entrambi i virus in questione. Tuttavia, poiche esso e apparso piu prossimo a GFV e ha mostrato comportamento intracellulare identico a quello riportato per lo stesso virus, e stato identificato come un ceppo di GFV. Questa sembra la prima segnalazione di una variante sierologica naturale di GFV. During a survey of virus diseases of Grapevine in Tunisia a strain of Grapevine fanleaf virus (GFV) was isolated from a symptomatic vine grown at Raf Raf, in the northern part of the country. This virus, as shown in the present paper, proved to be serologically distinguishable from ordinary GFV strains.