关于玉米光合作用与叶片水分利用效率关系的研究

研究分析了玉米１７个自交系和１１个杂交种单叶光合速率，蒸腾速率和叶片水分利用效率。结果表明，玉米自交系或杂交种间单叶ＰＨ、ＴＲ和ＷＵＥ存在着显著差异。ＷＵＥ与ＰＨ呈极正相关关系，且较ＷＵＥ与ＴＲ的关系更密切。玉米单叶的ＷＵＥ、ＰＨ、ＴＲ值会随着叶位、生育时期、光辐射强度、种植密度不同而不同，也会由于源库比改变、植株个体 间差异而变化。ＷＵＥ和ＰＨ之产是回归直线的斜率随生率的推延而增大，但几乎不受源

Relationship between Water Use Efficiency and Leaf Photosynthesis of Maize

Seventeen inbred lines and eleven hybrids were used to studing the relationship between the leaf photosynthesis rate(PH), transpiration rate(TR)and the water use efficiency (WUE)in maize(Zea mavys L. ). The results indicated that the single-leaf PH, TR and WUE of different genotypes were quite different from each other. The WUE was highly significantly correlated with the PH, whereas the relationship between the WUE and the TR was not as close. The single-leaf WUE, PH and TR in maize variety with differences in leaf position, growth stage, light intensity and plant density. They were also influenced by the ratio between the source and the sink, as well as differance among individual plants. The slope of the linear regression curve between WUE and PH increased with the progress of the growth stages, but it was hardly influenced by changes in the source and sink ratio, nor by plant density. Because of higher leaf PH and lower TR single-cross, hybrid Zhongdan 14 had higher WUE as compared with its parents. It was suggested, therefore, that PH could be a criteria in breeding or cultivation for the increase of the water use efficiency.