TY  - JOUR
AU  - Bonente, G.
AU  - Pippa, S.
AU  - Castellano, S.
AU  - Bassi, R.
AU  - Ballottari, M.
TI  - Acclimation of Chlamydomonas reinhardtii to different growth irradiances
JO  - The journal of biological chemistry
VL  - 287
SN  - 0021-9258
CY  - Bethesda, Md.
PB  - Soc.
M1  - PreJuSER-22170
SP  - 5833 - 5847
PY  - 2012
N1  - This work was supported by European Union Project 245070 FP7-KBBE-2009-3 SUNBIOPATH.
AB  - 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.
KW  - Adaptation, Physiological: radiation effects
KW  - Chlamydomonas reinhardtii: growth & development
KW  - Chlamydomonas reinhardtii: metabolism
KW  - Chlamydomonas reinhardtii: physiology
KW  - Chlamydomonas reinhardtii: radiation effects
KW  - Darkness
KW  - Dose-Response Relationship, Radiation
KW  - Electron Transport: radiation effects
KW  - Light
KW  - Light-Harvesting Protein Complexes: metabolism
KW  - Photosynthesis: radiation effects
KW  - Photosystem I Protein Complex: metabolism
KW  - Photosystem II Protein Complex: metabolism
KW  - Pigments, Biological: metabolism
KW  - Light-Harvesting Protein Complexes (NLM Chemicals)
KW  - Photosystem I Protein Complex (NLM Chemicals)
KW  - Photosystem II Protein Complex (NLM Chemicals)
KW  - Pigments, Biological (NLM Chemicals)
KW  - J (WoSType)
LB  - PUB:(DE-HGF)16
C6  - pmid:22205699
C2  - pmc:PMC3285353
UR  - <Go to ISI:>//WOS:000300638000058
DO  - DOI:10.1074/jbc.M111.304279
UR  - https://juser.fz-juelich.de/record/22170
ER  -