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

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 Rep

journal_title

EMBO reports

authors

Finazzi G,Rappaport F,Furia A,Fleischmann M,Rochaix JD,Zito F,Forti G

doi

10.1093/embo-reports/kvf047

keywords:

subject

Has Abstract

pub_date

2002-03-01 00:00:00

pages

280-5

issue

3

eissn

1469-221X

issn

1469-3178

pii

kvf047

journal_volume

3

pub_type

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