文献类型：期刊文章

作　　者：莫亿伟[1] 郭振飞[1]

机构地区：[1]华南农业大学生命科学学院,草业生物技术实验室,广东广州510642

出　　处：《草地学报》

年　　份：2008

卷　　号：16

期　　号：1

起止页码：100-102

语　　种：中文

收录情况：CAB、CAS、CSCD、CSCD_E2011_2012、IC、JST、RCCSE、ZGKJHX、ZR、普通刊

摘　　要：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.The seedlings of alfalfa(M.sativa cv.Longdong) and Guyana stylosanthes(S.guianensis cv.CIANT 184) were grown in glasshouse with temperature 20 to 30℃ under natural light condition.Six to seven-week seedlings of these two legumes were divided into three groups and transferred to growth chambers with three temperature treatments,respectively.The first group was subjected to temperature at 5 to 6℃ as cold treatment,the second group at 35 to 36℃ as heat treatment,and the third group at 25℃ as control.After a given time of treatment, the physiological indices were measured and the experimental results were summarized in the following sections.1 Sugars metabolism in response to temperature stressCompared to seedlings under room temperature,significant decrease of relative water content and increase of MDA content and ion leakage in alfalfa leaves occurred after 2 days of heat stress,while no significant changes were detected for those under cold stress for 5 days.The results indicate that alfalfa was easily injured by heat stress but tolerant to cold stress.On the contrary,Guyana stylosanthes maintained relatively high relative water content,low ion leakage,and low MDA content after 5 days of heat stress,while the MDA content and ion leakage were significantly increased under cold stress,indicating that Guyana stylosanthes was tolerant to heat stress,but sensitive to cold stress.The contents of total soluble sugars and sucrose and the activities of sucrose phosphate synthase(SPS) and sucrose synthase(SS)

关 键 词：温度胁迫 光合作用 柱花草 还原  苜蓿 热带亚热带地区 豆科牧草 北方地区  

分 类 号：S688.4] Q945.11]