银叶病对西葫芦叶片光合特性和叶绿体超微结构的影响

以西葫芦杂交种‘硕丰早玉’为材料, 烟粉虱诱导西葫芦银叶病, 研究了其对叶片净光合速率、气孔导度、胞间CO2浓度和叶绿体超微结构的影响。结果表明, 西葫芦发生银叶病后, 叶片光合速率降低, 气孔导度降低, 胞间CO2浓度增加。与健康叶片相比, 发病叶片叶绿体膜受损, 叶绿体数量和体积均减少, 基粒数和片层数减少, 淀粉粒数量和大小减少。西葫芦发生银叶病后, 叶绿体超微结构的变化可能是导致发病叶片叶绿素含量降低和光合速率下降的重要原因。

Effects of Squash Silverleaf on Photosynthetic Characteristics and Chloroplast Ultra-structure of the Summer Squash Leaves

Using shuofeng,one cultivar of summer squash(Cucurbita pepo L.),as material,silverleaf whitefly induced the silvering symptoms.The effect of squash silverleaf on photosynthetic rates(Pn),stomatal conductance(Gs),intercellular CO2 concentration(Ci)and chloroplast ultra-structure were studied.The Pn of silvered leaves was lower than that in the healthy leaves.The Gs of silvered leaves decreased but the Ci of silvered leaves increased.Chloroplast membrane was impaired,the size and number of chloroplasts decrea...