外来杂草小花山桃草对干旱胁迫的生理响应  

Physiological responses of exotic weeds Gaura parviflora to drought stress

作　　者：黄萍[1] 贾东坡[1] 袁志良[2] 梅世秀[2] 叶永忠[2] 

机构地区：[1]河南农业职业学院,河南中牟451450 [2]河南农业大学生命科学学院,郑州450002

出　　处：《东北农业大学学报》2011年第4期102-106,共5页Journal of Northeast Agricultural University

基　　金：国家重点基础研究发展规划项目(G200048603-4)

摘　　要：通过人工控制水分模拟干旱,研究了外来杂草小花山桃草在干旱胁迫条件下及复水后丙二醛(MDA)、脯氨酸和叶绿素含量及超氧化物歧化酶(SOD)活性的变化,旨在探讨其耐旱性的生理基础。结果表明,小花山桃草在干旱胁迫下可维持较高的SOD活性,较低的MDA积累速率,游离脯氨酸大量积累,总叶绿素含量小幅上升,叶绿素a/b比值先升后降,说明细胞膜系统受害较轻。复水后各指标接近正常水平,补偿效应显著,表明小花山桃草有较强的抗旱性和回复生长的能力。Gaura parviflora was treated with drought stress,the content of free proline,malon-dialdehyde（MDA）,chlorophyll and the activity of superoxide dismutase（SOD） were investigated.The results showed that Gaura parviflora could maintain high SOD activity,large proline gain,low rate of MDA accumulation,chlorophyll content increased slightly,the ratio of chlorophyll a and b was raised at the beginning and then decreased.It could be confirmed that its cell membrane system was harmed lightly.In addition,the recovery speed of physiological function was fast after rewater treatments,which indicated that Gaura parviflora had stronger drought resistance and recovery than field crops.

关 键 词：小花山桃草 干旱胁迫 复水 生理响应 

分 类 号：S451[农业科学—植物保护] Q948[生物学—植物学]