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ASSOCIATION OF A POSSIBLE CLOSTEROVIRUS WITH GRAPEVINE LEAFROLL IN NORTHERN ITALY

F. FAORO, R. TORNAGHI, A. FORTUSINI and G. BELLI
Rivista di Patologia Vegetale
Serie IV, Vol. 17, No. 3/4 (Luglio-Dicembre 1981), pp. 183-189
Stable URL: http://www.jstor.org/stable/42556815
Page Count: 7
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
ASSOCIATION OF A POSSIBLE CLOSTEROVIRUS WITH GRAPEVINE LEAFROLL IN NORTHERN ITALY
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Abstract

In ultrathin sections of leafroll infected grapevines cv. Barbera, growing in Northern Italy, aggregates of very elongated, flexuous particles were observed. They had a diameter of about 10 nm and were localized in the phloem, sometimes associated with vesicles containing a fibrillar network; no other inclusion was found in the cells. Because of shape, diameter, type of aggregation and location of the particles, and the presence of vesicles, we have considered them to be virions belonging to the closterovirus group. The results are in agreement with a similar study previously carried out in Japan and confirm the association of a possible closterovirus with grapevine leafroll disease. In sezioni ultrasottili di nervature di foglie di viti cv. Barbera con accartocciamento fogliare prelevate nell'Oltrepo Pavese (PV) sono stati osservati aggregati di particelle virali flessuose e molto allungate. Le particelle avevano un diametro di circa 10 nm ed erano localizzate nel floema, talvolta associate a vescicole contenenti fibrille; nelle cellule non erano presenti altre inclusioni. La forma, dimensione, tipo di aggregazione e localizzazione delle particelle, nonché la presenza di vescicole contenenti fibrille, fanno ritenere che si tratti di un closterovirus. I risultati sono in accordo con quelli di un precedente simile studio effettuato in Giappone e confermano l'associazione di un possihile closterovirus con la malattia dell'accartocciamento fogliare della vite.

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