干热胁迫对紫花苜蓿叶片生理特性的影响

本研究以6份紫花苜蓿（Medicago sativa）种质为试验材料，对干热胁迫和复水条件下紫花苜蓿叶片的叶绿素含量、相对电导率、水分饱和亏缺的变化进行分析。结果表明，在干热胁迫下，随着胁迫时间的延长，紫花苜蓿叶片水分饱和亏缺逐渐升高；相对电导率除16和15号种质在胁迫第8天降低外，其他种质都呈上升趋势；叶绿素含量除了16号种质在胁迫第8天升高外，其他种质都呈下降趋势；试验初步判断26号种质的耐干热性较差，28号种质的耐干热性较好。相关性分析表明，叶绿素含量与水分饱和亏缺呈显著负相关，与相对电导率呈负相关，相对电导率与水分饱和亏缺呈正相关，说明水分亏缺和高温胁迫对细胞膜造成伤害，严重影响苜蓿叶绿素的合成。

Effects of drought and heat stress on physiological characteristics in alfalfa leaves

Leaf chlorophyll content,relative conductivity and water saturation deficit were determined in six gernplasms of alfalfa when subjected to heat stress and rehydrated condition.The results showed that as heat stress prolonged: 1) the water saturation deficit increased in all gernplasms;2) the relative conductivity increased except accession 16 and 15 decreased in the eighth day;3) leaf chlorophyll content decreased except accession 15 increased in the eighth day.Based on the results,present study suggested t...