Abstract: Alfalfa(Medicago sativa L.) and Guyana stylosanthes(Stylosanthes guianensis(Aubl.) Sw.) are two important forage legumes with high feeding quality.Alfalfa is cold-tolerant,but heat-sensitive,while Guyana stylosanthes is heat-tolerant,but cold-sensitive.In order to explore the adaptation mechanisms to temperature stress,the physiological responses of sugars metabolism,photosynthesis,and nitrogen reduction of these two forage legumes under low and high temperature stresses were comparatively studied by this paper.

Key words: Alfalfa, Guyana stylosanthes, Nitrate reductase, Photosynthesis, ATP synthase, Sucrose synthase

摘要： 苜蓿(Medicago sativa L.)和柱花草(Stylosant hesgui anensis(Aubl.)Sw.)均为优质豆科牧草,前者耐寒但不耐热,主要种植在北方地区,而后者耐热不耐寒,主要种植在热带亚热带地区。为探讨这两种牧草对温度胁迫的适应机制,本文从温度胁迫对其伤害、渗透调节物质含量的变化光合作用、N还原等方面开展了研究。

关键词: 苜蓿, 柱花草, 硝酸还原酶, 光合作用, ATP合酶, 蔗糖合酶