Journal ArticleDOI
Analyse de la croissance des feuilles du sarment de vigne : estimation de sa surface foliaire par échantillonnage
Alain Carbonneau,G. Lecatre +1 more
TLDR
The analysis of the external structure of the vine shoot showed a subdivision of the shoot into three zones in which the growth speed of the leaves is variable, and confirmed the existence of three foliar screws.Abstract:
L'analyse de la structure externe du sarment de vigne a permis d'etablir : l'evolution de sa surface foliaire totale au cours du temps ; les courbes de croissance des feuilles de rang different, faisant apparaitre la subdivision du rameau en trois zones ou la vitesse de croissance des feuilles est variable ; la confirmation de l'existence de trois helices foliaires dont les effets se manifestent sur les aires des feuilles, en particulier pour les plus âgees.Ces observations d'interet general ont conduit a une application pratique interessante : l'elaboration d'une technique d'echantillonnage pour mesurer la surface foliaire totale d'un sarment, puis d'une plante. La precision se situe aux alentours de 95 p. 100 si l'en mesure environ 30 p. 100 des feuilles du rameau reparties egalement dans les trois tiers et sur chacune des trois helices foliaires.+++The analysis of the external structure of the vine shoot has allowed us to establish : the evolution of whole leaf area throughout the season and the growth curves concerning the leaves of different levels. This analysis showed a subdivision of the shoot into three zones in which the growth speed of the leaves is variable, and confirmed the existence of three foliar screws ; this is particulary evident in the oldest leaf areas.These general observations has led us to an useful and interesting application : the elaboration of a sampling technique measuring the whole leaf area of a shoot, then of a plant. The precision is approximately 95 p. 100, if we measure 30 p. 100 of the leaves of a shoot, equally distributed in the three zones and on each of the three foliar screws.read more
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TL;DR: The flowering of Vitis vinifera spreads over two seasons and the flowers are hermaphroditic and most are self-pollinated but cross-pollination also occurs.
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Journal ArticleDOI
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