水稻生育过程中，ＲｕＢＰ羧化酶活性与光合速率、ＲｕＢＰ加氧酶活性与光呼吸速率、ＲｕＢＰ羧化酶活性与加氢酶活性以及光合速率与光呼吸速率之间是相关的。籼型品种与粳型品种间酶活性的高低及光合、光呼吸速率的高低基本一致，籼型三系杂交稻（Ｆ１）无明显的光合优势。酶的羧化活性的高低只在一定范围内与光合速率的高低平行。在正常生育条件下，酶蛋白的数量不是水稻光合速率的限制因子。 The activities of RuBP carboxylase, photosynthetic rate, RuBP oxygenase activity and photorespiration rate, RuBP carboxylase activity and hydrogenase activity, and photosynthetic rate and photorespiration rate were correlated in the process of rice growth. There were basically the same enzymatic activities and the photosynthetic and photorespiration rates between indica and japonica cultivars. The indica three-line hybrid rice (F1) had no obvious photosynthetic advantages. The level of carboxylase activity of the enzyme only in parallel with the level of photosynthesis rate within a certain range. Under normal fertility conditions, the amount of enzyme protein is not a limiting factor for photosynthetic rate in rice.