| Acclimation of Chlamydomonas reinhardtii to different growth irradiances. | |
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MedLine Citation:
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PMID: 22205699 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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We report on the changes the photosynthetic apparatus of Chlamydomonas reinhardtii undergoes upon acclimation to different light intensity. When grown in high light, cells had a faster growth rate and higher biomass production with respect to low and control light conditions. However,cells acclimated to low light intensity are indeed able to produce more biomass per photon available as compared to high light acclimated cells, which, indeed, dissipate as heat a large part of light absorbed, reducing their photosynthetic efficiency. This dissipative state is strictly dependent on the accumulation of LhcSR3, a protein related to Light Harvesting Complexes (Lhc), responsible for non-photochemical quenching in microalgae. Other changes induced in the composition of the photosynthetic apparatus upon high light acclimation, consist into an increase of carotenoids content on a chlorophyll basis, particularly zeaxanthin, and a major down-regulation of light absorption capacity by decreasing the chlorophyll content per cell. Surprisingly, the antenna size of both Photosystem I and II are not modulated by acclimation; rather, the regulation affects PSI/PSII ratio. Major effects of the acclimation to low light consist into increased activity of state1-stete 2 transitions and increased contribution of cyclic electron flow. |
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Authors:
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Giulia Bonente; Sara Pippa; Stefania Castellano; Roberto Bassi; Matteo Ballottari |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-12-28 |
Journal Detail:
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Title: The Journal of biological chemistry Volume: - ISSN: 1083-351X ISO Abbreviation: - Publication Date: 2011 Dec |
Date Detail:
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Created Date: 2011-12-29 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 2985121R Medline TA: J Biol Chem Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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University of Verona, Italy. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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