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以 6个典型的不同穗重类型水稻品种为材料 ,对其部分光合生理特性进行了研究。从光合日变化上看 ,重穗型品种冈优 5 2 7一天中不同时间的净光合速率均显著高于中穗型品种汕优 6 3和轻穗型品种密阳 46 ,特别是中午光合“午睡”现象较轻 ;从光—光合曲线看 ,其量子效率差异较小 ,饱和光强下冈优 5 2 7的净光合速率比汕优 6 3和密阳 46分别高 9.6 %和 17.8%;在 10 0～ 30 0 μL/ L CO2 浓度下 ,冈优 5 2 7净光合速率上升最快 ,汕优 6 3次之 ,密阳 46最低 ;冈优 5 2 7和密阳 46的光合最适温度均在 35℃左右 ,较汕优 6 3(30℃左右 )高。气孔开度总量 (单位面积叶片上的气孔密度乘以其气孔开度 )大是净光合速率高的重要生理基础之一。
Six typical varieties with different panicle types were used as materials to study some photosynthetic characteristics. From photosynthetic diurnal variation, the net photosynthetic rate of heavy-ear cultivars Gangyou 527 during different days was significantly higher than that of middle-ear cultivars Shanyou 63 and light-ear cultivars Moya 46, especially at noon photosynthesis. Nap lightness ". The difference of quantum efficiency from light-photosynthesis curve was small. Net photosynthetic rate of Gangyou 5 2 7 was 9.6% and 17.8% higher than that of Shanyou 63 and Minyang 46 respectively under saturated light intensity. At 10 0 ~ 30 0 μL / L CO2 concentration, the net photosynthetic rate of Gangyou 5 27 was the fastest, the Shanyou 6 3 times and the Miryang 46 the lowest, and the photosynthesis of Gangyou 52 7 and Miyang 46 was the best Temperature is about 35 ℃, Shantou 6 3 (30 ℃ or so) high. The total stomatal opening (stomatal density per unit area of leaves multiplied by the stomatal opening) is one of the important physiological basis of high net photosynthetic rate.