草业科学2011，Vol.28Issue(11)：1950-1956,7.
过量铁胁迫对豌豆幼苗光合特性和叶绿体膜的影响
Effects of excess iron stress on photosynthetic characteristics and chloroplast membranes in pea seedling leaves
摘要
Abstract
A hydroponic experiment was employed to study the effects of excess iron on the photosynthetic characteristics and on the compositions and fluidity of chloroplast membrane in pea （Pisum sat[rum） seed- ling leaves. The results indicated that with the iron concentration increased, net photosynthetic rate （Pn）, stomatal conductance （G,）, transpiration rate （Tr）, intercellular CO2 concentration （Ci）, water use effi- ciency （WUE） and carboxylation efficiency （CE） showed various degree of downward trends. Chlorophyll content and maximal fluorescence （Fro）, the PS I] maximal photochemical efficiency （Fv/Fm）, PS II poten- tial photochemical efficiency （Fv/Fo）, photosynthetic electron transport rate （ETR）, maximum quantum yield （Yield） and photochemical quenching coefficient （qP） also declined. However, primary fluorescence （Fo） and non-photochemical quenching coefficient （qN） increased. At the same time, content of unsaturated fatty acids and membrane fluidity of chloroplast increased, while the saturated fatty acids decreased. These results suggested that the iron stress not only caused stomata[ inhibition but also destroyed the photosynthetic structure directly. Furthermore, the iron stress also resulted in inactivation of photosynthesis center, decreases of both primary capture capacity and assimilation efficiency of light energy, and increasing leaf chloroplast membrane unsaturation degree, which caused a decline in photosynthetic capacity of pea seedlings finally.关键词
叶绿体膜/铁过量/豌豆/光合特性/脂肪酸/膜流动性Key words
chloroplast membrane/iron stress/Pisum sativum/photosynthetic characteristics/fattyacids/membrane fluidity分类
农业科技引用本文复制引用
蔺冬梅,徐世健,张新芳,安黎哲,杨晓明,刘慧艳..过量铁胁迫对豌豆幼苗光合特性和叶绿体膜的影响[J].草业科学,2011,28(11):1950-1956,7.基金项目
国家自然科学基金项目 （）
甘肃平台项目 （）
