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.
journal_name
EMBO Repjournal_title
EMBO reportsauthors
Finazzi G,Rappaport F,Furia A,Fleischmann M,Rochaix JD,Zito F,Forti Gdoi
10.1093/embo-reports/kvf047keywords:
subject
Has Abstractpub_date
2002-03-01 00:00:00pages
280-5issue
3eissn
1469-221Xissn
1469-3178pii
kvf047journal_volume
3pub_type
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