Effects of saline-sodic stress on the photosynthesis rate, transpiration rate and water use efficiency of Leymus chinensis

Abstract

Abstract: Changes of photosynthetic rate (Pn), transpiration rate (Tr) and water use efficiency (WUE) of L. chinensis were investigated under different saline-sodic stress conditions by culturing in soils of five pH values. Pn, Tr, Gs and VpdL increased and Ci decreased with increased simulated photosynthetic radiation, while the WUE first increased, then decreased. Under the same simulated photosynthetic radiation, Pn and Tr decreased and WUE increased as saline-sodic stress increased. For example, when the simulated photosynthetic radiation was 1 500 μmol/m²·s, Pn and Tr of L. chinensis growing at pH 9.78 saline-sodic stress were reduced 43.8% and 51.3% respectively compared with those of the CK (pH 7.15). Under saline-sodic stress, L. chinensis has a higher water use efficiency (WUE) since Tr is reduced more than Pn. This could be an important physiological mechanism of saline-sodic tolerance of L. chinensis.

CLC Number:

HUANG Li-hua, LIANG Zheng-wei, MA Hong-yuan. Effects of saline-sodic stress on the photosynthesis rate, transpiration rate and water use efficiency of Leymus chinensis[J]. Acta Prataculturae Sinica, 2009, 18(5): 25-30.

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