紫花苜蓿水分利用效率对水分胁迫的响应及其机理

草业学报 ›› 2009, Vol. 18 ›› Issue (3): 207-213.

紫花苜蓿水分利用效率对水分胁迫的响应及其机理

刘国利,何树斌,杨惠敏^*

兰州大学草地农业科技学院农业部草地农业生态系统学重点开放实验室,甘肃兰州730020

收稿日期:2008-07-15 出版日期:2009-06-20 发布日期:2009-06-20
作者简介:刘国利(1981-),男,河北唐山人,在读硕士。
基金资助:
973计划课题(2007CB108901),教育部高等学校博士学科点专项科研基金(20070730032)和兰州大学“萃英计划”引进人才专项基金资助。

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

LIU Guo-li, HE Shu-bin, YANG Hui-min

Key Laboratory of Grassland Agro-Ecosystems of Ministry of Agriculture, School of Pastoral
Agriculture Science and Technology, Lanzhou University, Lanzhou 730020, China

Received:2008-07-15 Online:2009-06-20 Published:2009-06-20

摘要/Abstract

摘要： 采用盆栽试验,测定了3种紫花苜蓿品种的光合(Pn)、蒸腾(Tr)、胞间CO₂浓度(Ci)、气孔密度和叶片碳同位素组成(δ¹³C)等,探讨不同紫花苜蓿品种在水分胁迫下的水分利用效率(WUE)的变化。结果显示,陇东苜蓿和新疆大叶苜蓿叶片WUE在50%田间持水量(FWC)水分胁迫下最高,在75%FWC下最低,而阿尔冈金苜蓿则相反;以日为尺度,各品种在25%FWC下WUE最高,在75%和50%FWC下WUE大小则因品种不同而表现不同;Pn/Ci随水分胁迫增加而下降,而气孔密度上升;δ¹³C值也随水分胁迫的增加而增加。上述结果表明,水分胁迫可提高紫花苜蓿水分利用效率,但品种间有差异;气孔因素和叶片羧化效率共同影响紫花苜蓿的水分利用。

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.

中图分类号:

刘国利,何树斌,杨惠敏. 紫花苜蓿水分利用效率对水分胁迫的响应及其机理[J]. 草业学报, 2009, 18(3): 207-213.

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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