Photosynthetica 2007, 45(2):202 | DOI: 10.1007/s11099-007-0033-1

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

J. Moutinho-Pereira1,*, N. Magalhães2, B. Gonçalves1, E. Bacelar1, M. Brito, C. Correia1
1 CETAV, University of Trás-os-Montes e Alto Douro, Vila Real, Portugal
2 CECEA, University of Trás-os-Montes e Alto Douro, Vila Real, Portugal

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.

Additional key words: carotenoids; chlorophyll; internal CO2 concentration; leaf water potential; net photosynthetic rate; optical characteristics; stomatal conductance; starch and sugars; transpiration rate; water use efficiency

Received: July 17, 2006; Accepted: August 15, 2006; Published: June 1, 2007  Show citation

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Moutinho-Pereira, J., Magalhães, N., Gonçalves, B., Bacelar, E., Brito, M., & Correia, C. (2007). Gas exchange and water relations of three Vitis vinifera L. cultivars growing under Mediterranean climate. Photosynthetica, 45(2), 202. doi: 10.1007/s11099-007-0033-1
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