期刊
ENVIRONMENTAL AND EXPERIMENTAL BOTANY
卷 66, 期 2, 页码 265-269出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.envexpbot.2009.02.006
关键词
Arthrospira platensis; Buoyancy; Cyanobacterium; Floatation activity; PAR; Photosynthesis; UV irradiance
资金
- National Natural Science Foundation of China [90411018]
- Guangdong Natural Science Foundation [06105649]
- National Non-profit Institutes [2008M15]
- Hainan DIC Microalgae Co. Ltd
Buoyancy provided by gas vesicles has been suggested to play an important role in regulating vertical distribution and nutrient acquisition in cyanobacteria. However, little is known about how changes in UV radiation (UVR, 280-400 nm) would affect the buoyancy. We have shown here that the floatation activity of the economically important cyanobacterium Arthrospira platensis (D-0083) decreased with increased photosynthetic rates associated with increased photosynthetically active radiation (PAR), but it decreased less in the presence of UVR, which resulted in inhibitory effects. When the cells were grown under isoenergetic levels of solar PAR or UVR alone, they migrated downward under PAR but maintained buoyant under UVR. The buoyancy regulation of A. platensis depended on the exposed levels of PAR as well as UVR, which affected photosynthesis and growth in an antagonistic way. The buoyancy of A. platensis in water columns is likely to be dependant on diurnal photosynthetic performance regulated by solar radiation, and can hardly be considered as an active strategy to gain more energy during sunrise/sunset or to escape from harmful irradiation during the noon period. Crown Copyright (c) 2009 Published by Elsevier B.V. All rights reserved.
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