【摘要】 苜蓿(Medicago sativa)是我国乃至全世界最优质的豆科牧草之一,具有较高的经济价值、营养价值和生态价值。然而我国的苜蓿种植大多集中在干旱半干旱的西北、东北一带,水分是影响其产量的主要因素。本文通过对比光合呼吸系统、活性氧防御系统、渗透调节系统、脱落酸等在干旱胁迫下的变化分析了苜蓿抵御干旱胁迫的生理机制,同时对转录因子、蛋白酶基因和抗旱基因在苜蓿干旱胁迫下的应答过程进行了阐述,并对未来苜蓿应答干旱胁迫的研究重点进行了展望。更多还原

【Abstract】 Alfalfa(Medicago sativa) is a major forage crops throughout the world,and of great nutritional,economic,and ecological value. It is mainly cultivated in the northwestern and northeastern regions of China,where water is the main limiting factor influencing plant yield. In this study,we quantified changes in photosynthesis,respiration,antioxidant activity,osmoregulation,and abscisic acid levels under drought stress,and proposed the mechanisms of physiological response to drought stress in alfalfa. The response process involving transcription factors,protease genes,and drought-resistance genes under drought stress was investigated as well. In conclusion,our study emphasized the importance of response to drought stress in alfalfa from a new perspective.更多还原