Le Grapevine rupestris stem pitting-associated virus (GRSPaV) est un virus très répandu affectant Vitis spp. Bien que son interaction avec la Vitis vinifera puisse être considérée compatible, à cause de l'absence d'altérations phénotypiques notables, il peut arriver que des variantes puissent induire des symptômes différents sur des espèces de Vitis différentes. Cette recherche vise à étudier les modifications induites par le GRSPaV sur les caractéristiques physiologiques et agronomiques du cv Bosco (Vitis vinifera L.), cépage italien à raisin blanc. Nous avons comparé le comportement au vignoble de deux lignes d'un même clone de Bosco, greffé sur 1103 P , mais l'une avec et l'autre sans GRSPaV. Au cours de trois années consécutives (2010-12), nous avons déterminé les données biométriques de la grappe et du grain, le comportement agronomique et la composition du moût, à la vendange. De même les paramètres physiologiques principaux de la vigne, c'est-à-dire le taux de photosynthèse, le taux de transpiration, la conductance stomatique, la concentration de CO2 sous-stomatique et la teneur en chlorophylle des feuilles ont été mesurés en différentes périodes au cours de 2010 et 2011. La présence du virus a causé une diminution modérée de l'efficience physiologique et de la teneur en solides solubles ainsi qu'une plus forte acidité du moût. L'effet le plus évident de l'infection virale, quand même, était exercé sur les caractéristiques biométriques des baies, carrément réduites. Ces résultats suggèrent que même le GRSPaV, normalement considéré sans intérêt à cause de l'absence de symptômes sur Vitis vinifera, peut induire des modifications dans ses aptitudes
Grapevine rupestris stem pitting-associated virus (GRSPaV) is a widely spread virus affecting Vitis spp. Although it established a compatible viral interaction in Vitis vinifera L. without the development of phenotypic alterations, it can occur as distinct variants that showed different symptoms on diverse Vitis species. We investigated changes induced by GRSPaV on agronomic and physiological performances of V. vinifera cv. Bosco, an Italian white-grape variety. We compared the behaviour in the field of two lines, grafted onto 1103 P rootstock, of the same clone of Bosco, one GRSPaV-infected and one GRSPaV-free. In three consecutive years (2010-2012), bunch and berry biometric data, agronomic performances and juice composition were assessed at the harvest time. Likewise, the main physiological parameters, i.e. photosynthetic rate, transpiration rate, stomatal conductance, sub-stomatal CO2 concentration and leaf chlorophyll content of vines were measured in different dates during 2010 and 2011. The presence of the virus caused a moderate decrease of physiological efficiency and of juice soluble solids content as well as an increase of juice acidity. The most evident effect of the virus infection, however, was exerted on the biometric characteristics of berries which all resulted clearly reduced. The results suggest that also the GRSPaV, commonly reputed irrelevant for the absence of symptoms on Vitis vinifera, may induce changes on vine behaviour.
Effect of grapevine rupestris stem pitting-associated virus on the agronomical and physiological perforrmances of a clone of "Bosco" (Vitis vinifera L.)
Cuozzo D;Gambino G;Mannini F
2013
Abstract
Grapevine rupestris stem pitting-associated virus (GRSPaV) is a widely spread virus affecting Vitis spp. Although it established a compatible viral interaction in Vitis vinifera L. without the development of phenotypic alterations, it can occur as distinct variants that showed different symptoms on diverse Vitis species. We investigated changes induced by GRSPaV on agronomic and physiological performances of V. vinifera cv. Bosco, an Italian white-grape variety. We compared the behaviour in the field of two lines, grafted onto 1103 P rootstock, of the same clone of Bosco, one GRSPaV-infected and one GRSPaV-free. In three consecutive years (2010-2012), bunch and berry biometric data, agronomic performances and juice composition were assessed at the harvest time. Likewise, the main physiological parameters, i.e. photosynthetic rate, transpiration rate, stomatal conductance, sub-stomatal CO2 concentration and leaf chlorophyll content of vines were measured in different dates during 2010 and 2011. The presence of the virus caused a moderate decrease of physiological efficiency and of juice soluble solids content as well as an increase of juice acidity. The most evident effect of the virus infection, however, was exerted on the biometric characteristics of berries which all resulted clearly reduced. The results suggest that also the GRSPaV, commonly reputed irrelevant for the absence of symptoms on Vitis vinifera, may induce changes on vine behaviour.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.