不同玉米自交系光合特性的研究

通过对20个玉米自交系单叶光合速率的研究表明：(1)玉米自交系间单叶光合速率存在极显著的差异。(2)玉米自交系的光合速率随生育时期的推延而呈单峰曲线变化，以抽雄吐丝期为最大。自交系间的差异则随着生育时期的推延而逐渐增大。(3)在生态条件差异较大的海南和北京，不同自交系光合速率值高低的稳定性变差。(4)聚光分析的结果表明，自交系在光合性能两个主要性状—净光合速率和叶面积方面表现出多种类型。

Studies on Photosynthetic Properties of Different Maize Inbred Lines

Studies on the single leaf's photosynthetic rate (Pn)in 20 inbred maize varieties indicated: (1)The disparities of the single leaf's Pn were significant among these inbred maize. (2)The changing patterns of Pn, which were highest within silking period, reflected single-peak during the developmentphrase of inbred maize. The disparities of Pn among inbred maize, as mentioned above, were grad uallystrengthened along with the growing of maize. (3)In Beijing and Hainan,which are strikingly different ecological regions, the value of Pn among 20 inbred maize varieties became less stable. (4) Results basedon the cluster analysis, considering the two major photosyntic parameters, i e NAN and leaf area, suggestedthat the 20 inbred maize varieties should be assorted into a few types.