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PhotosyntheticaVolume 45, Issue 2, June 2007, Pages 202-207

Gas exchange and water relations of three Vitis vinifera L. cultivars growing under Mediterranean climate(Article)

  • aCETAV, University of Trás-os-Montes e Alto Douro, Apartado 1013, 5001-801 Vila Real, Portugal
  • bCECEA, University of Trás-os-Montes e Alto Douro, Apartado 1013, 5001-801 Vila Real, Portugal

Abstract

Optical characteristics, contents of photosynthetic pigments, total soluble sugars, and starch, rates of gas exchange, chlorophyll (Chl) a fluorescence, and leaf water relations were analysed in three Vitis vinifera L. cultivars, Tinto Cão (TC), Touriga Nacional (TN), and Tinta Roriz (TR), grown in Mediterranean climate. Chl content was significantly lower in TC than in TN and TR leaves, while the Chl a/b ratio was higher. TR had the lowest net photosynthetic rate, stomatal conductance, and contents of soluble sugars and starch than TN and TC. In spite of low Chl content, TC showed the lowest photon absorbance and the highest photochemical efficiency of photosystem 2. TC had the lowest predawn and midday leaf water potential. The capability for osmotic adjustment was similar among cultivars and the calculated modulus of elasticity was higher in TC leaves. The typical lighter green leaves of TC seemed to be an adaptive strategy to high irradiance and air temperature associated to water stress. © 2007 Institute of Experimental Botany, ASCR.

Author keywords

CarotenoidsChlorophyllInternal CO2 concentrationLeaf water potentialNet photosynthetic rateOptical characteristicsStarch and sugarsStomatal conductanceTranspiration rateWater use efficiency

Indexed keywords

Species Index:VitaceaeVitis vinifera

Funding details

Funding sponsor Funding number Acronym
Ministry of Agriculture - Saskatchewan

  • 1

    ***Master in Crop Sciences/Viticulture. +Corresponding author; fax: +351-259-350266, e-mail: [email protected] Abbreviations: Car – carotenoids; Chl – chlorophyll; Ci – internal CO2 concentration; DM/TM – dry mass/saturated mass; E – transpiration rate; F0, Fv, Fm – minimum, variable, and maximum fluorescence, respectively; Fv/Fm – photochemical efficiency of photosystem 2 of dark-adapted leaves; gs – stomatal conductance; PN – net photosynthetic rate; PN/gs – intrinsic water use efficiency; PPFD – photosynthetic photon flux density; PS – photosystem; R:FR – red/far-red ratio (660/730 nm); RWC0 – relative water content at zero turgor; SS – soluble sugars; εmax – maximum bulk modulus of elasticity; Ψπ – osmotic potential at full turgor; ΨPD, ΨMD – leaf water potential at predawn and midday, respectively. Acknowledgements: This research was partially financed by AGRO-INIA program (No 170) of Ministry of Agriculture (Portugal). We also thank to Centro de Estudos Vitivinícolas do Douro (DRATM), Dr Freitas, and Mr Lamas for the management of the experimental vineyard. Special thanks to the anonymous reviewers for their valuable suggestions and comments.

  • ISSN: 03003604
  • CODEN: PHSYB
  • Source Type: Journal
  • Original language: English
  • DOI: 10.1007/s11099-007-0033-1
  • Document Type: Article

  Moutinho-Pereira, J.; CETAV, University of Trás-os-Montes e Alto Douro, Apartado 1013, Portugal;
© Copyright 2008 Elsevier B.V., All rights reserved.

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