【摘要】 马铃薯Y病毒(PVY)侵染导致马铃薯叶片叶绿体个体变小,部分叶绿体的结构遭到破坏,淀粉粒的体积变小而粒数 密度提高。随着病毒侵染,叶片中的叶绿素含量逐步减少,光合系统电子传递速率和净光合速率显著下降,而光系统Ⅱ的 最大光化学效率则没有显著变化。PVY导致叶绿体结构破坏和碳同化酶活性下降,可能是造成光合作用下降的主要原因。更多还原

【Abstract】 The effects of Potato virus Y (PVY) infection on chloroplast ultrastructure and photosynthesis were investigated in potato. Electron microscopy showed that PVY infection disrupted the development of chloroplast and cell structure, resulted in the decreased size and irregular shape of chloroplast and starch particles. As the disease progressed, chlorophyll content, electron transfer rate and net pho-tosynthetic rate significantly decreased. The maximal photochemical efficiency, however, was not influenced by viral infection. It seems likely that the disrupted chloroplast together with the inactivation of enzymes in Calvin cycle are responsible for the suppressed photosynthesis by PVY.更多还原