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EMBO Rep. 2002 Mar;3(3):280-5. Epub 2002 Feb 15.

Involvement of state transitions in the switch between linear and cyclic electron flow in Chlamydomonas reinhardtii.

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1
Centro di Studio del C.N.R. sulla Biologia Cellulare e Molecolare delle Piante, Università degli Studi di Milano, 20161 Milano, Italy. giovanni.finazzi@unimi.it

Abstract

The energetic metabolism of photosynthetic organisms is profoundly influenced by state transitions and cyclic electron flow around photosystem I. The former involve a reversible redistribution of the light-harvesting antenna between photosystem I and photosystem II and optimize light energy utilization in photosynthesis whereas the latter process modulates the photosynthetic yield. We have used the wild-type and three mutant strains of the green alga Chlamydomonas reinhardtii--locked in state I (stt7), lacking the photosystem II outer antennae (bf4) or accumulating low amounts of cytochrome b6f complex (A-AUU)--and measured electron flow though the cytochrome b6f complex, oxygen evolution rates and fluorescence emission during state transitions. The results demonstrate that the transition from state 1 to state 2 induces a switch from linear to cyclic electron flow in this alga and reveal a strict cause-effect relationship between the redistribution of antenna complexes during state transitions and the onset of cyclic electron flow.

PMID:
11850400
PMCID:
PMC1084013
DOI:
10.1093/embo-reports/kvf047
[Indexed for MEDLINE]
Free PMC Article
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