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

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Spaceflight Microgravity Reduced Photosynthetical Electron Transport and Altered Energy Distribution in Euglena gracilis
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Affiliation: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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Fund Project: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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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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LI Xiao-Yan, LI Gen-Bao, LI Dun-Hai, HAO Zong-Jie, WANG Gao-Hong, RICHTER R. Peter, SCHUSTER Martin, LEBERT Michael, LIU Yong-Ding. Spaceflight Microgravity Reduced Photosynthetical Electron Transport and Altered Energy Distribution in Euglena gracilis[J]. Progress in Biochemistry and Biophysics,2016,43(9):887-894

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Received:June 15,2016
Revised:August 25,2016
Adopted:August 29,2016
Online: September 18,2016
Published: September 20,2016

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