空间飞行微重力降低裸藻光合电子传递并改变光合能量分配

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空间飞行微重力降低裸藻光合电子传递并改变光合能量分配
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作者单位:中国科学院水生生物研究所藻类生物学重点实验室,中国科学院水生生物研究所淡水生态和生物技术国家重点实验室,中国科学院水生生物研究所藻类生物学重点实验室,中国科学院水生生物研究所藻类生物学重点实验室,中国科学院水生生物研究所藻类生物学重点实验室,埃朗根大学,埃朗根大学,埃朗根大学,中国科学院水生生物研究所淡水生态和生物技术国家重点实验室
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基金项目:国家载人航天工程、国家自然科学基金(30970688)和淡水生态和生物技术国家重点实验室(2016FBZ07)资助项目

Spaceflight Microgravity Reduced Photosynthetical Electron Transport and Altered Energy Distribution in Euglena gracilis

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Key Laboratory of Algal Biology,Institute of Hydrobiology,Chinese Academy of Sciences,State Key Laboratory of Freshwater Ecology and Biotechnology,Institute of Hydrobiology,Chinese Academy of Sciences,Key Laboratory of Algal Biology,Institute of Hydrobiology,Chinese Academy of Sciences,Key Laboratory of Algal Biology,Institute of Hydrobiology,Chinese Academy of Sciences,Key Laboratory of Algal Biology,Institute of Hydrobiology,Chinese Academy of Sciences,Department of Biology,Cell Biology Division,Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen,Germany,Department of Biology,Cell Biology Division,Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen,Germany,Department of Biology,Cell Biology Division,Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen,Germany,State Key Laboratory of Freshwater Ecology and Biotechnology,Institute of Hydrobiology,Chinese Academy of Sciences

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This work was supported by grants from The Chinese Natural Science Foundation (30970688), State Key Laboratory of Freshwater Ecology and Biotechnology (2016FBZ07), and the Chinese Manned Spaceflight Project

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摘要:

利用神舟8号飞船的SIMBOX发射机会，对真实微重力影响裸藻光合作用活性进行了研究．我们发现，微重力降低了光合活性(Fv/Fm)，提高了细胞内叶绿素a和胡萝卜素含量．快速叶绿素荧光动力学研究显示微重力降低了叶绿素荧光强度，但快速叶绿素荧光动力学曲线的形状(O-J-I-P)没有改变．在微重力处理下裸藻的最大光化学效率(φPo)、用于电子传递的量子产额(φEo)和光合作用性能指数(PIABS and PICS)都明显降低，但单位反应中心吸收的光能(ABS/RC)和单位反应中心耗散的能量(DIo/RC)都明显升高．77K低温荧光光谱实现微重力改变了能量在PSⅠ和PSⅡ之间的分配并出现了红移现象．这些结果表明真实微重力降低光合作用的活性有可能通过两个途径，即抑制裸藻抑制光合电子传递中PSⅡ的受体端和改变PSⅠ的结构从而引起流向PSⅠ的能量传递减少．

Abstract:

The effects of 17-day spaceflight microgravity on the photosynthetic activity of Euglena gracilis were investigated during the SIMBOX mission on board the Chinese Shenzhou-8 spacecraft. We found that microgravity decreased Fv/Fm, while chlorophyll a and carotenoid contents were increased. The fluorescence yields were clearly reduced by microgravity, but the shape of fluorescence transients (O-J-I-P) was not changed. The quantum yield of primary photochemistry (φPo), the quantum yield of electron transport (φEo) and the performance index of PSⅡ(PI_ABS and PI_CS) in microgravity group were decreased, while ABS/RC and DIo/RC were increased. 77K fluorescence emission spectra indicated that microgravity altered energy distribution between PSⅡ and PSⅠ and there are redshifts under microgravity. These results suggested that microgravity may impair photosynthesis by inhibition of acceptor sides of PSⅡ in electron transfer pathway and alter PSⅠ structure to cause a reduction of energy transfer to PSⅠ in Euglena gracilis.

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李小燕,李根保,李敦海,郝宗杰,王高鸿,RICHTER R. Peter, SCHUSTER Martin, LEBERT Michael,刘永定.空间飞行微重力降低裸藻光合电子传递并改变光合能量分配[J].生物化学与生物物理进展,2016,43(9):887-894

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收稿日期:2016-06-15
最后修改日期:2016-08-25
接受日期:2016-08-29
在线发布日期: 2016-09-18
出版日期: 2016-09-20

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