关键词：
铜锤草;酢浆草;水分胁迫;叶绿素荧光;生理指标
摘 要：
分别采用单一与混合种植方式和不同梯度的水分胁迫处理,对外来种铜锤草和本地种酢浆草的生长、生理指标、叶绿素荧光参数进行了比较研究。结果表明,随水分胁迫的增强,2个物种叶片的相对含水量,叶绿素a、b和蛋白质含量下降,电导率、MDA含量和O2-.产生速率呈上升趋势。保护酶SOD、POD活性在SD胁迫时达到峰值,然后下降,且POD比SOD对干旱更敏感;在相同水分胁迫条件下,酢浆草比铜锤草的变化幅度大,且混合种植下的酢浆草比单一种植下的变化幅度大;F0呈上升趋势;Fv、Fm、Fv/Fm、Fm/F0呈下降趋势,T、HT和C在SD胁迫时具有统计学意义(P<0.05),HC在MD时就开始显著下降(P<0.05)。总之,2个物种的叶绿素荧光参数与生理指标变化规律相似,说明外来种铜锤草比本地种酢浆草有更强的耐旱能力,而且在混合种植下具有较强的夺水和光合竞争能力。
译 名：
A comparative study on the physiological properties of the exotic species Oxalis corymbosa and the native species Oxalis corniculata under water stress
作 者：
CHEN Ming-lin,WANG You-bao(College of Life Sciences,Anhui Normal University,Wuhu 241000,China)
关键词：
Oxalis corymbosa;O.corniculata;water stress;chlorophyll;fluorescence physiological properties
摘 要：
A comparative study of the growth,physiological properties and chlorophyll fluorescence parameters of the exotic species Oxalis corymbosa and the native species O.corniculata was done using single and mixed plantings and four levels of water stress.The relative water content,chlorophyll a,b and protein contents in leaves of the two species decreased with intensified water stress,and they were opposite to the electrical conductivity,MDA and O2-·.The activities of POD and SOD reached a peak under SD stress,then decreased under VD stress: the former was more sensitive to drought than the latter.At the same water stress,the physiological properties of O.corymbosa changed with more amplitude than that of O.corniculata,and they changed more in O.corniculata in mixed plantings than in single species planting.The F0 value increased while Fv,Fm,Fv/Fm and Fm/F0 values of the two species all decreased with intensified water stress.Compared to the CK,values of Fv,Fm,Fv/Fm of T,HT,C were significantly different(P<0.05) under SD stress,while those of HC were significantly different(P<0.05) under MD stress.In essence,the changes of chlorophyll fluorescence parameters were similar to those of physiological properties.All parameters showed that exotic O.corymbosa has a stronger drought-resistance ability than native O.corniculata,and also has a stronger competitive ability and photosynthetic competitive ability.
