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Issue Agron. Sustain. Dev.
Volume 23, Number 4, May-June 2003
Page(s) 293 - 296
DOI 10.1051/agro:2003002

Agronomie 23 (2003) 293-296
DOI: 10.1051/agro:2003002

Relationship between CO 2 assimilation and leaf anatomical characteristics of two grapevine cultivars

Angelos Patakasa, Dimitrios Stavrakasa and Ioannis Fisarakisb

a  Laboratory of Viticulture, Aristotle University of Thessaloniki, PO Box 236, 54006 Thessaloniki, Greece
b  Dept. of Agriculture, Technological Institution of Crete, Estavromenos, 71500 Heraklion, Greece

(Received 18 October 2001; revised 25 July 2002; accepted 27 August 2002)

Abstract
The possible implication of leaf anatomical characteristics on the photosynthetic rate was studied in two grapevine cultivars, Ribier (Vitis vinifera L.) and Isabella (Vitis labrusca), grown under field conditions. Ribier exhibited higher photosynthetic rates than Isabella, although there were no significant differences in the Rubisco activity and the stomatal conductance. The fraction of mesophyll volume represented by the intercellular spaces as well as the surface area of mesophyll cells exposed to intercellular air spaces were significantly lower in Isabella. Both gaseous CO 2 conductance through intercellular airspaces and liquid phase conductance were significantly higher in Ribier than in Isabella, contributing to a higher photosynthetic rate in this cultivar.

Résumé
Relation entre l'assimilation de CO 2 et les caractéristiques anatomiques des feuilles de deux espèces de vigne. L'influence possible des caractéristiques anatomiques des feuilles sur le taux de photosynthèse a été étudiée pour deux espèces de vigne : Vitis Labrusca (Isabella) and Vitis vinifera L. (Ribier), cultivées en culture au champ. Ribier a présenté un taux photosynthétique plus élevé que Isabella, bien qu'il n'y ait pas de différences significatives de l'activité de la Rubisco et de la conductance stomatique. La fraction du volume de mésophylle représentée par l'espace intercellulaire, ainsi que la surface des cellules du mésophylle exposée à l'air dans l'espace intercellulaire, étaient significativement plus faibles chez Isabella. Les conductances gazeuses pour le CO 2 à travers l'espace intercellulaire et en phase liquide étaient significativement plus fortes pour Ribier que pour Isabella, contribuant à des taux photosynthétiques plus importants pour cette espèce.


Key words: leaf anatomy / mesophyll conductance / photosynthetic rate / Vitis vinifera / Vitis labrusca

Mots clés : anatomie des feuilles / conductance interne / taux photosynthétique / Vitis vinifera / Vitis labrusca

Correspondence and reprints: Angelos Patakas
    e-mail: patak@agro.auth.gr

Communicated by Gérard Guyot (Avignon, France)



© INRA, EDP Sciences 2003


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