高浓度LaCl_3抑制黄瓜(Cucumis sativus Linn)光系统Ⅱ(PSⅡ)活性  

Inhibitory Effect of High Concentration LaCl_3 on Photosystem Ⅱ Activity of Cucumber(Cucumis sativus Linn)

作　　者：王立丰[1] 李良璧[1] 白克智[1] 匡廷云[1] 

机构地区：[1]中国科学院植物所光合作用与环境分子生理学重点实验室

出　　处：《中国稀土学报》2005年第6期770-774,共5页Journal of the Chinese Society of Rare Earths

基　　金：国家重点基础发展计划(97.3)(G1998010100);国家自然科学基金(39890390)资助项目

摘　　要：研究了高浓度LaCl3对黄瓜(Cucumis sativus Linn.)的光系统Ⅱ(PSⅡ)光诱导荧光动力学参数、低温荧光光谱和放氧活性的影响。结果表明,随着黄瓜体内LaCl3浓度的升高、其荧光量子产率、PSⅡ最大光化学效率、放氧活性和电子传递速率都明显降低。低温荧光分析表明,低浓度LaCl3引起激发能更多的分配给PSⅡ。高浓度LaCl3对黄瓜幼苗的抑制作用表现在对类囊体膜结构的破坏,进而导致PSⅡ光合活性下降,并最终抑制黄瓜生长。The effects of LaCl3 on PS Ⅱ light-induced fluorescence kinetics, low temperature fluorescence spectrum combining with oxygen evolution of cucumber （Cucumis sativus Linn. ） were studied. Results show that the fluorescence yield, maximal efficiency of PS Ⅱ photochemistry, oxygen evolution and electron transport rate are decreased when LaCl3 concentrations in cucumber are increased. Low LaCl3 concentration causes redistribution of energy more in favor of photosystem Ⅱ than PS Ⅰ. The toxicity effects of LaCl3 on cucumber seedling are mainly due to the damage of chloroplast membrane and photosynthesis organelle resulted in the decrease of PS Ⅱ photochemistry activity and growth retardation.

关 键 词：LACL3 黄瓜 抑制 PSⅡ活性 能量分配 稀土 

分 类 号：Q945.12[生物学—植物学] O614.33[理学—无机化学]