草业学报2016，Vol.25Issue(6)：42-50,9.
荒漠灌木蒙古岩黄芪对干旱胁迫的生理响应
Physiological responses of the desert shrub Hedysarum mongolicum to drought stress
摘要
Abstract
A pot experiment was conducted to determine the effects of drought stress on the photosynthetic characteristics,antioxidant properties and osmotic adjustment substances of the desert shrub Hedysarum mon-golicum .The experiment used four different water treatments of 70%,50%,30% and 15% field moisture ca-pacity,representing serious (SED),moderate (MOD)and mild (MID)stresses and the control (CK),respec-tively.The photosynthetic characteristics (except intercellular CO2 concentration)under MOD and SED were significantly lower than those under CK.Compared to CK,the net photosynthetic rate and PSⅡ potential ac-tivity under MID increased 20.7% and 5.7% respectively.The malondialdehyde content,relative plasma per-meability,and the activities of superoxide dismutase,catalase and peroxidase were significantly higher under the MOD and SED treatments than CK,while there was no significant difference between MID and CK.The contents of proline,soluble sugar and K+ in leaves showed significant increase trends with the degree of drought stress.Compared to CK,Na+ contents in leaves,roots and stems showed significant decline trends.These results show that in response to stress H .mongolocum increases the activities of SOD (superoxide dis-mutase),CAT (catalase)and POD (peroxidase),increases relative plasma permeability in leaves,improves the contents of proline and soluble sugar,and enhances the selective absorption of K+ ,thereby reducing the damage of drought to the plant.Our findings provide the theoretical basis for understanding H .mongolocum adaptation to drought stress.The study also provides references for the protection and utilization of this plant and for vegetation restoration in arid and semiarid areas.关键词
蒙古岩黄芪/干旱胁迫/光合特性/抗氧化特性/渗透调节物质Key words
Hedysarum mongolocum/drought stress/photosynthetic characteristics/antioxidant properties/osmotic adjustment substances引用本文复制引用
吕娥娥,周向睿,周志宇,赵桂琴..荒漠灌木蒙古岩黄芪对干旱胁迫的生理响应[J].草业学报,2016,25(6):42-50,9.基金项目
国家自然基金资助项目（31201849）和农业部牧草种质资源保护项目（2013014）资助。 （）
