不同产量水平大豆叶片气体交换特性的比较

目的]探讨不同产量水平大豆叶片气体交换特性,为大豆高产新品种选育和高产栽培提供参考。方法]选择3个产量水平的9个栽培大豆品种,在相同环境条件下种植,于V4期（苗期）、R2期（盛花期）、R4期（结荚盛期）、R6期（鼓粒盛期）和R7期（成熟期）用Li-6400型光合作用测定系统,测定不同生育时期大豆叶片的净光合速率、气孔导度、蒸腾速率。结果]在全生育期内,高产品种大豆叶片净光合速率和气孔导度均显著高于低产品种。在V4期、R2期和R4期,高产品种叶片蒸腾速率显著高于低产大豆品种;在R6期和R7期不同产量水平大豆品种蒸腾速率差异不显著。V4期和R2期水分利用效率表现为低产品种﹥中产品种﹥高产品种,而在R4期、R6期和R7期则表现为高产品种﹥中产品种﹥低产品种。结论]高产大豆品种叶片的气体交换能力显著高于低产大豆品种,为其获得高产奠定了生理基础。净光合速率可作为选择高产大豆品种的一个有效指标。

Comparison of Gases Exchange Characteristic in Leaves of Soybean Cultivars at Different Yield Levels

Objective] The aim was to explore the gases exchange characteristic in leaves of soybean cultivars at different yield levels to provide a certain theories basis for high yield breeding and cultivation of soybean cultivars. Method] Nine soybean cultivars divided into three yield levels were planted under the same environmental condition. At V4(seedling) ,R2(blooming) ,R4(pod-bearing) ,R6(pod-filling) and R7(maturing) growth stages,the net photosynthetic rate(Pn) ,stomatal conductance(Gs) and transpiration ...