蓝藻类囊体膜色素蛋白的构象变化可引起快速的非光化学淬灭
查看参考文献41篇
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文摘
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铜绿微囊藻PCC7806经受短期的强光照射时,在类囊体膜相变温度以下可以测定到一个较高的非光化学淬灭(NPQ).这表明在强光照射下,光合系统Ⅱ(PSⅡ)复合体内有一种有别于状态转换淬灭和光抑制淬灭的NPQ产生机制,而且这种淬灭属于非光化学淬灭快组分(NPQ_f).膜蛋白构象的常用稳定剂戊二醛(GA)可以导致更多的能量传递到PSⅡ反应中心,主要影响藻胆体的能量吸收传递过程但不阻断能量传递途径.在用GA调节类囊体膜上色素蛋白(PPPTM)构象变化的对比实验中,快速光响应曲线和荧光诱导动力学快相表明,过量的激发能可以依赖于PPPTM的构象变化来耗散掉.基于NPQ暗弛豫动力学曲线的解卷积分析表明,这种NPQ_f与PPPTM的构象变化紧密相关,其占总NPQ的39.42%.因此,可以认为由PPPTM的构象变化所引起的NPQ是微囊藻水华应对夏秋季节强烈光照的一种重要的光保护适应机制. |
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来源
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中国科学. 生命科学
,2012,42(8):668-676 【核心库】
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关键词
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叶绿素荧光
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光保护
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铜绿微囊藻PCC7806
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非光化学淬灭
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类囊体膜蛋白
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地址
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中国科学院水生生物研究所, 武汉, 430072
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语种
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中文 |
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ISSN
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1674-7232 |
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学科
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植物学 |
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基金
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国家973计划
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国家水污染控制和修复重大项目
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文献收藏号
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CSCD:4716533
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