CMS and maintainer line of Dian-type Ⅰ is one of the most important technological systems used for japonica hybrid rice in China. Using Li-6400 portable photosynthesis system, seven photosynthetic parameters, including net photosynthetic rate (Pn), stomatal conductance (Gs), intercellular CO2 concentration (Ci), transpiration rate (Tr), water use efficiency (WUE), stomatal limitation (Ls), and chlorophyll content (SPAD), were measured on the top three leaves of 79 pairs of isonuclear alloplasmic CMS and mai...