Impaired respiration discloses the physiological significance of state transitions in Chlamydomonas.

ABSTRACT: State transitions correspond to a major regulation process for photosynthesis, whereby chlorophyll protein complexes responsible for light harvesting migrate between photosystem II and photosystem I in response to changes in the redox poise of the intersystem electron carriers. Here we disclose their physiological significance in Chlamydomonas reinhardtii using a genetic approach. Using single and double mutants defective for state transitions and/or mitochondrial respiration, we show that photosynthetic growth, and therefore biomass production, critically depends on state transitions in respiratory-defective conditions. When extra ATP cannot be provided by respiration, enhanced photosystem I turnover elicited by transition to state 2 is required for photosynthetic activity. Concomitant im

SUBMITTER: Cardol P 

PROVIDER: S-EPMC2747229 | biostudies-literature | 2009 Sep

REPOSITORIES: biostudies-literature