Réserves en glucides de la vigne (cv.Chasselas): influence du rapport feuille-fruit | Carbohydrate reserves in grapevine (cv.Chasselas): influence of leaf-fruit ratio
2012
Zufferey, V. | Murisier, F. | Belcher, S. | Lorenzini, F. | Spring, J.-L. | Viret, O., Station de recherche Agroscope Changins-Waedenswil ACW, Nyon (Switzerland) | Vivin, P.
The storage of carbohydrates (sugars) in different parts of the grapevine (canes, trunk and roots) was studied from 1998 to 2002 on Chasselas cultivar by Agroscope Changins- Wädenswil ACW at the Pully experimental vineyard. The vine primarily stores its carbohydrates, mainly as starch, in roots and trunk. During the winter, starch is partially converted into soluble sugars (sucrose, glucose and fructose) in trunk and canes, to provide protection against dropping temperatures and risk of tissues frost. A significant mobilisation of starch was observed in roots and trunks from budbreak to flowering, resulting in their lower starch reserves. The starch level increased in roots and trunks from flowering stage until harvest and sometimes until leaf fall. The leaf-fruit ratio, expressed by the “light-exposed leaf area (SFE)/kg fruit”, largely influenced starch and total carbohydrate contents in the roots and trunks at the harvest. In our experimental conditions, starch and total carbohydrates contents in the roots were at peak levels when the leaf-fruit ratio reached 1.5 m2 of SFE/kg.
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