农业环境科学学报2011，Vol.30Issue(5)：830-835,6.
镧浸种处理对玉米光合特性的影响
Effects of Lanthanum with Which Soaked Seeds on Photosynthetic Characteristics in Maize
摘要
Abstract
Effects of lanthanum on photosynthetic characteristics in maize were studed which seeds soaked with LaCl3 solution of 60 nag. L-1 and 120 mg· L-1 concentrations and sowed in pots, the experiment in the open air, based on measurements of photosynthetic gas exchange parameters, diurnal variations of photo synthesis, light intensity-photosynthetic rate response curves, CO2 concentrations-photosynthetic rate response curves and PEPCase activities at spike formation stage by using CIRAS- Ⅱ portable photosyntometer and spectrophotometer-meter,fitted the curve by the modified model of rectangular hyperbola, extraction of feature parameters. The results showed that the net photosynthetic rate(Pn ) at midday were increased significantly and "midday depress" attributed mainly to stoma factor were relieved by treated seeds with 60 mg· L-1 solution. Under treatments of the seeds soaked with LaCl3 solution, the apparent quantum yield(AQY), light saturation point (LSP) and the light compensation point(LCP) were improved significantly, but PEPCase activities, CO2 saturation point(CSP), and carboxylation efficiency(CE) were decreased. It was suggested that effects of lanthanum with which soaked the seodes could increase photosynthetic efficiency in maize leaves which mainly attributed to improving the use of light energy, but the use of external CO2 were prejudiced,widespread use of rare earth in agriculture still has well prospects for development.关键词
玉米(Zea mays L.)/La3+/表观量子效率/羧化效率/PEP羧化酶Key words
maize(Zea mays L. )/ La3+/ apparent quantum yield/ carboxylafion efficiency/ PEPCase分类
资源环境引用本文复制引用
张舜,廖颖,陶宗娅,罗学刚,吴国..镧浸种处理对玉米光合特性的影响[J].农业环境科学学报,2011,30(5):830-835,6.基金项目
国家科技支撑计划项目(2007BAB18B08-01) （2007BAB18B08-01）
四川省教育厅重点项目(07ZA089) （07ZA089）
