论文部分内容阅读
研究分析了玉米17个自交系和11个杂交种单叶光合速率(PH)、蒸腾速率(TR)和叶片水分利用效率(WUE)。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呈极显著正相关关系,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之间回归直线的斜率随生育期的推延而增大,但几乎不受源库比率改变、种植密度的影响。玉米单交种中单14较其父母本有PH提高而TR下降的趋势,因此,WUE显著增加。本文认为,提高WUE应从提高单叶PH入手,选配叶片光合能力强的玉米基因型或制定提高净光合速率、延长功能期等的栽培措施是提高玉米WUE的关键。
The leaf photosynthetic rate (PH), transpiration rate (TR) and leaf water use efficiency (WUE) of 17 inbred and 11 hybrid maize cultivars were studied. The results showed that there was a significant difference in single leaf PH, TR and WUE among maize inbred lines or hybrids. WUE and PH showed a significant positive correlation, and the relationship between WUE and TR was closer. The leaf WUE, PH, TR values of corn will vary with leaf position, growth period, light radiation intensity and planting density, and will also change due to the change of source-sink ratio and plant individual. The slope of the regression line between WUE and PH increases with the growth period, but it is hardly influenced by the change of source and sink ratio and planting density. Single corn crosses single 14 than their parents PH increased TR decreased, therefore, WUE increased significantly. This paper argues that it is the key to improve the WUE that WUE should be improved by increasing the single leaf PH, selecting the maize genotype with strong photosynthetic ability or setting up the net photosynthetic rate and prolonging the functional period.