高温胁迫下大苞景天的形态特征及生理响应  

Morphological characteristics and physiological response of Sedum amplibracteatum K. T. Fu under high temperature stress

作　　者：傅杨[1] 杨柳青[1] 吴红强 刘志昂 廖飞勇[1] 陈月华[1] 黄琛斐[1] FU Yang;YANG Liu—qing;ZHU Xiao—qing;WU Hong—qiang;LIU Zhi—ang;LIAO Fei—yong;CHEN Yue—hua;HUANG Chen—fei(School of Landscape Architecture,Central South University ofForestry and Technology,Changsha410004,Hunan,China;XiangtIdn Institute of Forestry Science,Xiangtan 411206,Hunan,China)

机构地区：[1]中南林业科技大学风景园林学院,湖南长沙410004 [2]湘潭市林业科学研究所,湖南湘潭411206

出　　处：《中南林业科技大学学报》2015年第4期56-59,共4页Journal of Central South University of Forestry & Technology

基　　金：湖南省教育厅重点项目(13A126)

摘　　要：为了研究大苞景天Sedum amplibracteatum K.T.Fu的耐热性及在不同高温胁迫下的生理特点,采用美国生产的Licor6400便携式光合仪对大苞景天的荧光参数进行了测定。结果表明:随着高温胁迫程度的慢慢增加,大苞景天叶片出现卷曲、萎蔫、变黄、干枯脱落等症状,部分植物茎基部变软腐烂,反映了其不耐高温的特点。在高温胁迫过程中,大苞景天叶片相对含水量和荧光参数呈下降趋势,电导率呈上升趋势。大苞景天的生理变化和形态特征,表明其不耐高温。To study the thermal stability of Sedum amplibracteatum K. T. Fu and physiological characteristics under different high temperature stress, the Licor 6400 portable photosynthetic apparatus produced by U.S.A. was used to determine fluorescence parameters of S. amplibracteatum. The results show that since the degrees of high temperature stress were slowly increased, S. amplibracteatum leaves appeared symptoms of curly, dry, yellow wilting, dried-up and drop, part of the plant stem base were soft and rot, the symptoms reflected that S. amplibracteatum had not temperature withstanding characteristics. In the process of the high temperature stress, the relative water content of leaves and fluorescence parameters of S.amplibracteatum had a descending trend; and the conductivity showed a upward trend. From the physiological change and morphological characteristics, S. amplibracteatum cannot resist high temperature.

关 键 词：高温胁迫 大苞景天 形态特征 生理变化 

分 类 号：S682.32[农业科学—观赏园艺]