The responses and mechanisms of water use efficiency to different water stresses of three alfalfa varieties

Abstract

Abstract: Water use efficiency (WUE) of alfalfa was investigated under water stress. The physiological changes in leaf net photosynthetic rate (Pn), transpiration rate (Tr), intercellular CO₂ concentration (Ci), stomatal density, and carbon isotope composition (δ¹³C) of three alfalfa varieties were measured at three soil water levels in a greenhouse pot experiment. WUE of Longdong and Xinjiangdaye varieties was the greatest at 50% field water capacity (FWC) and the least at 75%FWC but the opposite for Algonquin. At 25%FWC, WUE of all varieties was the best in the daytime, but for 75%FWC and 50%FWC, the results were not consistent. Pn/Ci declined as water stress became more severe, while both stomatal density and δ¹³C increased. This suggests that water stress could to some extent enhance WUE of alfalfa, but responses differed between varieties. In addition, stomatal regulation and leaf carboxylation efficiency could both play roles in modulating WUE of alfalfa.

CLC Number:

LIU Guo-li, HE Shu-bin, YANG Hui-min. The responses and mechanisms of water use efficiency to different water stresses of three alfalfa varieties[J]. Acta Prataculturae Sinica, 2009, 18(3): 207-213.

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