肇东苜蓿对高温的生理响应  

Physiological Responses of Medicago sativa L. cv. Zhaodong to High Temperature Stress

作　　者：姜义宝[1] 王成章[1] 崔国文[2] 

机构地区：[1]河南农业大学牧医工程学院,河南郑州450002 [2]东北农业大学动物科学技术学院,黑龙江哈尔滨150030

出　　处：《草地学报》2009年第6期803-806,共4页Acta Agrestia Sinica

基　　金：国家科技支撑计划项目(2006BAD0409);河南省教育厅项目(2009A230004)

摘　　要：高温对紫花苜蓿(Medicagosativa L.)产生伤害,使其生长缓慢,易生病害,以肇东苜蓿(Medicago sativaL.cv.zhaodong)为材料,研究在40℃高温胁迫条件下叶片细胞膜相对透性、叶绿素含量、抗氧化系统和叶绿素荧光特性等生理指标的变化情况。结果表明:随高温时间的延长,肇东苜蓿叶片的细胞膜相对透性和丙二醛(MDA)含量增高,叶绿素含量、过氧化物酶(POD)、超氧化物歧化酶(SOD)、过氧化氢酶(CAT)等抗氧化系统以及叶绿素荧光Fv/Fm、Fv/Fo呈降低的变化趋势。高温下生理指标的改变,可为高温地区肇东苜蓿栽培管理和抗热苜蓿品种选育提供理论依据。High temperature is harmful to alfalfa and induces slow growth and incidence of disease.In this paper,leaf cell membrane permeability,chlorophyll content,anti-oxidative system,and the chlorophyll fluorescence characteristics of Medicago sativa L.cv.Zhaodong were analyzed under high temperature stress（40℃）.The results show that with the increasing exposure time to high temperature,leaf cell membrane permeability and MDA content were increased,while leaf chlorophyll content,activities of POD,SOD and CAT,chlorophyll fluorescence Fv/Fm and Fv/Fo had a decreasing tendency.This study offers the theoretical guidance for alfalfa planting and management in high temperature region and the breeding and selection of high temperature resistant variety.

关 键 词：肇东苜蓿 高温 叶绿素荧光 抗氧化酶 

分 类 号：Q945.7[生物学—植物学] Q949.747.9