Physiological Responses of Synechocystis sp. PCC 6803 under Clinorotation

Photosystem efficiency and the characteristic on oxidative stress were examined to elucidate the metabolic responses of Synechocystis sp. PCC 6803 to short-term clinorotation. Results compiled when using clinostat to simulate microgravity for 60 h, showed that clinorotation clearly prohibited the ph...

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Bibliographic Details
Published in:Microgravity science and technology 2012-09, Vol.24 (4), p.281-286
Main Authors: Zhang, Yu, Li, Xiao-yan, Wang, Gao-hong, Hu, Chun-xiang, Liu, Yong-ding
Format: Article
Language:English
Subjects:
Aerospace Technology and Astronautics
Classical and Continuum Physics
Engineering
Original Article
Oxidative stress
Photochemicals
Physiological responses
Physiology
Space Exploration and Astronautics
Space Sciences (including Extraterrestrial Physics
Synechocystis
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Summary:Photosystem efficiency and the characteristic on oxidative stress were examined to elucidate the metabolic responses of Synechocystis sp. PCC 6803 to short-term clinorotation. Results compiled when using clinostat to simulate microgravity for 60 h, showed that clinorotation clearly prohibited the photochemical quantum yield, but promoted the synthesis of chlorophyll and total protein. This may be a compensatory mechanism for the algal cell to maintain its normal metabolism. An increased malondialdehyde (MDA) content of algal cell upon clinorotation, together with an enhanced catalase (CAT) activity was observed during the whole period of clinorotation. One conclusion is that short-term clinorotation acts as a kind of stress, and that these physiological responses may be a special way for an algal cell to adapt itself to a different environment other than earth gravity.
ISSN:0938-0108
1875-0494
DOI:10.1007/s12217-012-9311-z