Studies on photosynthetic rate of hybrid rice

本研究旨在探讨杂种优势对光合作用的作用机理和细胞质雄性不育对光合作用的影响。得到的结果如下：1。部分杂种在单叶光合速率上表现出杂种优势。光合速率与蒸腾的相关系数。可溶性蛋白含量。叶绿素含量、氮含量显著。特别是光合速率与蒸腾作用关系密切。F_2杂种在单叶光合作用中的频率分布。有两种类型。一种是双峰分布，另一种是双对称分布。从这些结果中。作者认为光合速率的遗传不仅受主基因的控制。还有polly genes。细胞质雄性不育系（WA）对光合速率无影响。蒸腾和叶绿素含量。

The present study was carried out in order to investigate mechanism of heterosis on photosynthesis and effect of cytoplasmic male sterility on photosynthesis. The results obtained are as follows:1. Some F_1 hybrids showed heterosis in the single leaf photosynthetic rate.2. Correlation coefficients between photosynthetic rate and transpiration. soluble protein content. chlorohyll content, nitrogen content were significant. Especially photosynthetic rate and transpiration showed close relationship.3. For frequency distribution of F_2 hybrids in the single leaf photosynthesis. there are two types. One is bimodal distribution and the other is bisymmetric distribution. From these results. the author considered that the inheritance of photosynthetic rate was controlled not only by major genes. but also polly genes.4. Cytoplasmic male sterile line(WA) had not affect on photosynthetic rate. transpiration and chlorophyll content.