论文部分内容阅读
The whole-plant morphology,leaf ultrastructure,photosynthesis as well as enzyme activities of two tomato cultivars (Meifen-2 and Hongsheng) to differential light availabilities (450-500 μmol m-2 s-1,75-100 μtmol m-2 s-1) were examined in controlled environment.The results showed that the plant biomass and root/shoot ratio decreased and the specific leaf area increased significantly under the low light condition.There was a significant increase in malondialdehyde (MDA) concentration,superoxide dismutase (SOD) and peroxidase (POD) activities and decrease in soluble sugar and protein contents in LL-grown plants.For both cultivars,downregulation of photosynthesis and electron transport components were observed in LL-grown plants,the inhibition of the photosynthesis under the LL condition could be partially explained by the decrease of stomata density and by the changes of chloroplast.