【摘要】 对经空间飞行搭载而获得的通罗鱼腥藻突变株的分析发现，与对照相比，它在生长率和光合效率方面明显较高．进一步分析其光合色素的组成，叶绿素荧光及PSII／PSI比值，发现突变株的PC／Chl比值明显低于对照藻株，而叶绿素荧光高于对照，PSII／PSI比值是对照藻株的1.7倍，在其它光合色素的比例上也有差异．分析这些结果表明，突变株与对照株在光合特征上有差异可能是突变株在色素系统的改变引起光能捕捉和光能利用上更为高效的原因．更多还原

【Abstract】 It was found that the mutant of Anabaena siamensis which was obtained from　monoclonal culture of spaceflight Anabaena is of higher growth rate and photosynthetic efficiency than the ground control. To explain the differences between the mutant and the control, The composition of pigments, chlorophyll fluorescence and the ratio of PSII/PSI was　investigated. Results showed that the ratio of PC/Chl in mutant was lower than that in the　control, but the chlorophyll fluorescence and the ratio of PSII/PSI were higher than those in　the control. The results suggested that the higher efficiency in energy harvesting and in energy utilization of the mutant than those of the control is due to the photosynthetic characteristic discrepancy.更多还原