Journal Article

PreJuSER-22170

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Acclimation of Chlamydomonas reinhardtii to different growth irradiances

Bonente, G. ; Pippa, S. ; Castellano, S. ; Bassi, R.FZJ* ; Ballottari, M.

2012
Soc. Bethesda, Md.

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Please use a persistent id in citations: doi:10.1074/jbc.M111.304279

Abstract: 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 compared with low and control light conditions. However, cells acclimated to low light intensity are indeed able to produce more biomass per photon available as compared with high light-acclimated cells, which dissipate as heat a large part of light absorbed, thus reducing their photosynthetic efficiency. This dissipative state is strictly dependent on the accumulation of LhcSR3, a protein related to light-harvesting complexes, responsible for nonphotochemical quenching in microalgae. Other changes induced in the composition of the photosynthetic apparatus upon high light acclimation consist of an increase of carotenoid 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 is not modulated by acclimation; rather, the regulation affects the PSI/PSII ratio. Major effects of the acclimation to low light consist of increased activity of state 1 and 2 transitions and increased contributions of cyclic electron flow.

Keyword(s): Adaptation, Physiological: radiation effects (MeSH) ; Chlamydomonas reinhardtii: growth & development (MeSH) ; Chlamydomonas reinhardtii: metabolism (MeSH) ; Chlamydomonas reinhardtii: physiology (MeSH) ; Chlamydomonas reinhardtii: radiation effects (MeSH) ; Darkness (MeSH) ; Dose-Response Relationship, Radiation (MeSH) ; Electron Transport: radiation effects (MeSH) ; Light (MeSH) ; Light-Harvesting Protein Complexes: metabolism (MeSH) ; Photosynthesis: radiation effects (MeSH) ; Photosystem I Protein Complex: metabolism (MeSH) ; Photosystem II Protein Complex: metabolism (MeSH) ; Pigments, Biological: metabolism (MeSH) ; Light-Harvesting Protein Complexes ; Photosystem I Protein Complex ; Photosystem II Protein Complex ; Pigments, Biological ; J

Note: This work was supported by European Union Project 245070 FP7-KBBE-2009-3 SUNBIOPATH.

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Contributing Institute(s):

1. Pflanzenwissenschaften (IBG-2)

Research Program(s):

1. Terrestrische Umwelt (P24)
2. SUNBIOPATH - Towards a better sunlight to biomass conversion efficiency in microalgae (245070) (245070)

Appears in the scientific report 2012

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Database coverage:
; BIOSIS Previews ; Current Contents - Life Sciences ; JCR ; NCBI Molecular Biology Database ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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