温度胁迫对草莓叶绿素荧光参数的影响

Effects of Temperature Stress on Chlorophyll Fluorescence Parameters of Fragaria×ananassa Duch cv.Toyonoka

采用日本丰香草莓品种进行实验,研究低温(-10℃和-5℃)和高温(35℃和40℃)胁迫对其叶片叶绿素荧光特性的影响。结果发现,温度胁迫后,草莓叶片的最大荧光(Fm)、PSⅡ原初光能转化效率(Fv/Fm)、PSⅡ光化学效率(Y ield)、光化学猝灭系数(qP)均明显下降。可见,温度胁迫后,草莓叶片的光合作用能力明显低于对照(25℃),并且随着胁迫时间的延长,光合作用能力进一步降低。相对于对照温度(25℃),胁迫温度越高或越低,对草莓叶片的影响越大。

The experiments were made with Fragaria×ananassa Duch.cv.Toyonoka as test material.The effects of low temperature stress（-10℃ and-5℃） and high temperature stress（35℃ and 40℃）on chlorophyll fluorescence were investigated.Compared to control temperature（25℃）,the maximal fluorescence（Fm）,the primary conversion of PSⅡ（Fv/Fm）,actual photochemical efficiency of PSⅡ in the light（Yield）,and photochemical quenching coefficient（qP） all declined.After temperature stress,the capable of photosynthesis of leaves of Fragaria×ananassa Duch.cv.Toyonokawith was obviously lower than control temperature（25℃）,and the capable of photosynthesis was further decreased along with extending time of temperature stress.Compared to control temperature（25℃）,effect of leaves of Fragaria×ananassa Duch.cv.Toyonoka was bigger with higher or lower temperature stress.