Abstract
A new strain of Chlorella sp. (Chlorella-Arc), isolated from Arctic glacier melt water, was found to have high specific growth rates (μ) between 3 and 27 °C, with a maximum specific growth rate of 0.85 day−1 at 15 °C, indicating that this strain was a eurythermal strain with a broad temperature tolerance range. To understand its acclimation strategies to low and high temperatures, the physiological and biochemical responses of the Chlorella-Arc to temperature were studied and compared with those of a temperate Chlorella pyrenoidosa strain (Chlorella-Temp). As indicated by declining F v/F m, photoinhibition occurred in Chlorella-Arc at low temperature. However, Chlorella-Arc reduced the size of the light-harvesting complex (LHC) to alleviate photoinhibition, as indicated by an increasing Chl a/b ratio with decreasing temperatures. Interestingly, Chlorella-Arc tended to secrete soluble sugar into the culture medium with increasing temperature, while its intracellular soluble sugar content did not vary with temperature changes, indicating that the algal cells might suffer from osmotic stress at high temperature, which could be adjusted by excretion of soluble sugar. Chlorella-Arc accumulated protein and lipids under lower temperatures (<15 °C), and its metabolism switched to synthesis of soluble sugar as temperatures rose. This reflects a flexible ability of Chlorella-Arc to regulate carbon and energy distribution when exposed to wide temperature shifts. More saturated fatty acids (SFA) in Chlorella-Arc than Chlorella-Temp also might serve as the energy source for growth in the cold and contribute to its cold tolerance.
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Acknowledgments
The financial support from Hi-Tech Research and Development Program of China (No. 2012AA021706) and China Postdoctoral Science Foundation Funded Project (Nos. 2013M531370, 2014T70532, and 2014M561661) for this research is gratefully acknowledged.
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Kewei Cao and Meilin He contributed equally to this work.
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Cao, K., He, M., Yang, W. et al. The eurythermal adaptivity and temperature tolerance of a newly isolated psychrotolerant Arctic Chlorella sp.. J Appl Phycol 28, 877–888 (2016). https://doi.org/10.1007/s10811-015-0627-0
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DOI: https://doi.org/10.1007/s10811-015-0627-0