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Int. J. Mol. Sci. 2017, 18(1), 33; doi:10.3390/ijms18010033

Changes of Photosynthetic Behaviors and Photoprotection during Cell Transformation and Astaxanthin Accumulation in Haematococcus pluvialis Grown Outdoors in Tubular Photobioreactors

1,2,3
,
1,4
,
1,4
,
1,4
and
1,2,3,*
1
Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
2
National-Local Joint Engineering Research Center for Haematococcus pluvialis and Astaxanthin, Yunnan Alphy Biotech Co., Ltd., Chuxiong 675012, China
3
Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China
4
Institute of Oceanology, University of Chinese Academy of Sciences, Beijing 100049, China
*
Author to whom correspondence should be addressed.
Academic Editor: Yongsheng Chen
Received: 23 October 2016 / Revised: 8 December 2016 / Accepted: 20 December 2016 / Published: 26 December 2016
(This article belongs to the Special Issue Algae Based Bio-Renewable Energy for Sustainability)
View Full-Text   |   Download PDF [8663 KB, uploaded 26 December 2016]   |  

Abstract

The cell transformation from green motile cells to non-motile cells and astaxanthin accumulation can be induced in the green alga Haematococcus pluvialis cultured outdoors. In the initial 3 d of incubation (cell transformation phase), light absorption and photosynthetic electron transport became more efficient. After five days of incubation (astaxanthin accumulation phase), the light absorption per active reaction center (ABS/RC) increased, but the efficiency of electron transport (ψo) and the quantum yield of electron transport (φEo) decreased with increased time, indicating that the capacity of photosynthetic energy utilization decreased significantly during astaxanthin accumulation, leading to an imbalance between photosynthetic light absorption and energy utilization. It would inevitably aggravate photoinhibition under high light, e.g., at midday. However, the level of photoinhibition in H. pluvialis decreased as the incubation time increased, which is reflected by the fact that Fv/Fm determined at midday decreased significantly in the initial 3 d of incubation, but was affected very little after seven days of incubation, compared with that determined at predawn. This might be because the non-photochemical quenching, plastid terminal oxidase, photosystem I cyclic electron transport, defensive enzymes and the accumulated astaxanthin can protect cells against photoinhibition. View Full-Text
Keywords: astaxanthin; chlorophyll a fluorescence transient; Haematococcus pluvialis; photoinhibtion; photosynthetic behavior astaxanthin; chlorophyll a fluorescence transient; Haematococcus pluvialis; photoinhibtion; photosynthetic behavior
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Zhang, L.; Su, F.; Zhang, C.; Gong, F.; Liu, J. Changes of Photosynthetic Behaviors and Photoprotection during Cell Transformation and Astaxanthin Accumulation in Haematococcus pluvialis Grown Outdoors in Tubular Photobioreactors. Int. J. Mol. Sci. 2017, 18, 33.

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