朱砂叶螨危害对木薯幼苗光合作用及叶绿素荧光参数的影响

Effects of Tetranychus cinnabarinus stress on photosynthesis and chlorophyll fluorescence properties of cassava seedling

摘要: 研究了朱砂叶螨（Tetranychus cinnabarinus）危害对不同木薯品种光合作用及叶绿素荧光参数的影响。结果表明：与健康植株相比，随着危害时间的延长，4 个木薯品种净光合速率（Pn）、蒸腾速率（Tr）、气孔导度（Gs）、最大荧光（Fm）和PSII 最大光化学效率（Fv/Fm）均降低，其中Pn 降低2.57～7.62 umol/m2·s，Tr 降低0.13～1.28 mmol/m2·s，Gs 降低0.020～0.176 umol/m2·s，Fm 降低0.031～0.241，Fv/Fm 降低0.037～0.11，而胞间CO2 浓度（Ci）和初始荧光（Fo）升高，其中Ci 升高3.51～158.5 μmol/mol，Fo 升高0.023～0.09。4 个木薯品种光合特性及叶绿素荧光参数不存在差异。

Abstract: The paper studied the photosynthesis and chlorophyll fluorescence parameters of cassava seedling after Tetranychus cinnabarinus harm. The results showed that: compared with control，the Pn，Tr，Gs，Fm， Fv/Fm of cassava declined，Pn decreased to 2.57-7.62 umol/m2·s，Tr decreased to 0.13-1.28 mmol/m2·s ，Gs decreased to 0.020-0.176 umol.m2·s，Fm decreased to 0.031-0.241，Fv/Fm decreased to 0.037-0.11，while Ci and Fo increased，Ci increased to 3.51-158.5 μmol/mol，Fo increased to 0.023-0.09. There was no difference in the photosynthetic traits and parameters of chlorophyll fluorescence of four cassave varieties.