河南农业科学2011，Vol.40Issue(5)：37-41,5.
低氮胁迫下玉米地方品种形态特征和光合特性的变化
The Effects of Low-N Stress on Plant Morphology and Photosynthesis of Maize Landraces at Seedling Stage
摘要
Abstract
Using pot culture with 5 maize landraces dp10, dp12, dp23, dp31 and dp40, their plant morphology and photosynthetical efficiency at seedling stage were investigated under low-N stress condition. The results showed that low-N stress had a negative influence on seedling morphology and photosynthetical efficiency to a degree. There existed differences among maize landraces tolerant to lowN stress. The dp40 had a higher tolerance to low-N stress since its indexes tolerant to low-N stress of plant height. The number of visible leaves, leaf area, the number of roots,root volume, above-ground dry weight, root dry weight, root top ratio and photosynthetical efficiency were 0.95, 0.84, 0.43, 0.86, 0.74, 0.55, 0.87, 0.91 and 0.49, respectively. There were differences in tolerance to low-N stress, both among the same traits of different maize landraces and different traits of a maize landrace. Based on the ranges of their indexes tolerant to lowN stress, leaf area(0.19-0.43), above-ground dry weight(0.26-0.62), root volume(0.22-0.87) ,and photosynthetical efficiency(0.16-0.49) were found to be reliable indexes for identifying the germplasm tolerant to low-N stress. In addition, there is rich germplasm of maize landraces in China, which could be used to genetically improve corn hybrids tolerant to low-N stress.关键词
玉米地方品种/低氮胁迫/形态特征/光合强度Key words
Maize landraces/ Low-N stress/ Plant morphology/ Photosynthetical efficiency分类
农业科技引用本文复制引用
姚启伦,胡芳,许江..低氮胁迫下玉米地方品种形态特征和光合特性的变化[J].河南农业科学,2011,40(5):37-41,5.基金项目
国家"863"计划(2009AA10AA030) （2009AA10AA030）
教育部科学技术重点项目(KJ091316) （KJ091316）
重庆市教委科研项目(KJ091308) （KJ091308）
