| 高浓度LaCl3抑制黄瓜(Cucumis sativus Linn)光系统Ⅱ(PS Ⅱ)活性 |
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| 引用本文： | 王立丰,李良璧,白克智,匡廷云. 高浓度LaCl3抑制黄瓜(Cucumis sativus Linn)光系统Ⅱ(PS Ⅱ)活性[J]. 中国稀土学报, 2005, 23(6): 770-774 |
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| 作者姓名： | 王立丰 李良璧 白克智 匡廷云 |
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| 作者单位： | 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 北京 100093;中国科学院研究生院 北京 100047
2. 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 北京 100093 |
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| 基金项目： | 国家重点基础发展计划（97.3）（G1998010100）和国家自然科学基金（39890390）资助项目 |
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| 摘 要： | 研究了高浓度LaCl3对黄瓜（Cucumis sativus Linn）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对黄瓜幼茁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。
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| 关 键 词： | LaCl3 黄瓜 抑制 PSⅡ活性 能量分配 稀土 |
| 文章编号： | 1000-4343（2005）06-0770-05 |
| 收稿时间： | 2005-03-02 |
| 修稿时间： | 2005-03-022005-04-25 |
Inhibitory Effect of High Concentration LaCl3 on Photosystem Ⅱ Activity of Cucumber (Cucumis sativus Linn) |
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| Wang Lifeng,Li Liangbi,Bai Kezhi,Kuang Tingyun. Inhibitory Effect of High Concentration LaCl3 on Photosystem Ⅱ Activity of Cucumber (Cucumis sativus Linn)[J]. Journal of the Chinese Society of Rare Earths, 2005, 23(6): 770-774 |
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| Authors: | Wang Lifeng Li Liangbi Bai Kezhi Kuang Tingyun |
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| Affiliation: | 1. Key Laboratory of Photosynthesis and Environmental Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China ; 2. Graduate School of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | The effects of LaCl_3 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 LaCl_3 concentrations in cucumber are increased.Low LaCl_3 concentration causes redistribution of energy more in favor of photosystem II than PS I.The toxicity effects of LaCl_3 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. |
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| Keywords: | LaCl_3 cucumber inhibition PS II photochemistry energy distribution rare earths |
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