Distribution of leaf photosynthesis and transpiration within grapevine canopies under different drought conditions

蒸腾作用 天蓬 光合作用 拦截 光合有效辐射 气孔导度 生物 栽培 农学 用水效率 光强度 叶面积指数 环境科学 植物 园艺 生态学 物理 光学
作者
José M. Escalona,Jaume Flexas,Josefina Bota,H. Medrano
出处
期刊:Vitis: Journal of Grapevine Research [Julius Kühn-Institut]
卷期号:42 (2): 57-64 被引量:97
标识
DOI:10.5073/vitis.2003.42.57-64
摘要

The effects of seasonal drought on the distribution of leaf area, photosynthesis and transpiration within the canopy were evaluated for two Spanish grapevine cultivars. Both varieties were cultivated according to their typical training system. At early stages of drought, reduction of photosynthesis and transpiration was only observed in sun-exposed leaves. As drought intensified, even less sun-exposed leaves were affected. Severe drought reduced photosynthesis and transpiration in all locations of the canopy except for most shaded leaves in the inner part. However, those leaves were almost unproductive, and seemed to be insensitive to variation of both light intensity and drought. Leaf area was also reduced by drought, but the distribution of these reductions within the canopy differed between cultivars, possibly reflecting differences in the training system. Leaves from all locations of the canopy except those in the central part showed a similar radiation use efficiency, suggesting that the observed variation in photosynthesis within the canopy was mostly related to different light interception, while other factors such as different leaf age should play only a minor role. Photosynthetic radiation use efficiency strongly depended on both, pre-dawn leaf water potential and light-saturated stomatal conductance. The interest of these results for modeling purposes is discussed.

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