关键词: 玉米, 细胞突变体, 光合作用 , 叶绿素荧光, 耐低磷

Abstract: The maize inbred lines SD-C and SD-D regenerated by cell engineering with low level phosphorus tolerance, and inbred line Qi-319 (as control) were used to study leaf photosynthetic characteristic under low level phosphorus conditions. The results show that under low phosphorus stress, phosphate content and photosynthetic rate of maize leaves were decreased, reductions of which were less in SD-C and SD-D than in Qi-319. The reduction of the photosynthetic rate might be controlled by non-stomatal limitation in SD-C and SD-D, while by stomatal limitation in 319. Efficiency of light energy conversion and utilization by maize leaves PSⅡ were decreased by low phosphorus stress, which were higher in SD-C and SD-D than in Qi-319. The effect of low phosphorus stress was less in SD-C and SD-D than in Qi-319. The different inorganic phosphorus content in leaves contributed to the variation of photosynthesis and chlorophyll fluorescence in the tolerant maize lines and the control line.

Key words: photosynthesis , chlorophyll fluorescence, low-level phosphorus tolerance, cell mutant, maize