Abstract
Water use efficiency (WUE) of higher plants is of vital importance in the dry-land agricultural ecosystem in terms of the development of water-saving agriculture. Of all the approaches used to improve WUE, the intrinsic water use efficiency (WUE T, the ratio of CO 2 assimilation rate to transpiration rate) can be a right index, as the variation of WUE T is correlated with the physiological and biochemical processes of higher plants. The measurements of leaf gas exchange and carbon isotope discrimination (D 13C) are the two ways to detect the variation in WUE T. This article reviewed some physiological processes related to WUE T, including the relationship between CO 2 assimilation and stomatal conductance and WUE T and water absorption. The relationship between WUE and aquaporin and the yield are discussed as well.
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