关键词: 超级稻, 光响应曲线, 模型, 气孔导度, 水分利用率

Abstract: The typical varieties （Liangyoupeijiu, Y Liangyou 1, Y Liangyou 2, Y Liangyou 900, Chaoyouqianhao） of the super hybrid rice program in different phase were used in this study. Four typical models of photosynthesis light response curve（rectangular hyperbolic model, non-rectangular hyperbolic model, modified rectangular hyperbolic model, and exponential function）were adopted to fit the photosynthesis light response curve of five rice varieties. The results showed that, all the four models could well fit the photosynthesis light response curves of the five rice varieties（R2>0.99）; modified rectangular hyperbolic model had better fitting results in terms of conformity with measured values; the light use efficiency of Y Liangyou 900 and Chaoyouqianhao were highest, Y Liangyou 900 had the highest net photosynthesis rate, the light saturation point of Y Liangyou 900 and Y Liangyou 1 were highest, the dark respiration rate of Y Liangyou 900 and Liangyoupeijiu were highest, and the photosynthetic products were the most consumed. Except Y Liangyou 2, the stomatal conductance of other four varieties were grown faster, and not found stomatal; the water use efficiency of the tested varieties showed a straight line increasement with the increasement of light intensity when the light intensity was less than 800 mmol/（m2·s）. When the light intensity continued to increase, the WUE grew slowly and gradually became stable, but Y Liangyou 900 showed still growth. Therefore, in the bright light intensity and long sunshine hours planting areas, there is still a greater yield potential for Y Liangyou 900.

Key words: super rice, light response curve, model, stomatal conductance, water utilization efficiency