ibclogo XVI International Botanical Congess

Abstract Number: 3833
Session = 4.15.6


Characterization of Mutants of Chlamydomonas Deficient in State Transition


J.-D. Rochaix, M. Fleischmann, S. Ravanel, R. Delosme*, J. Olive*, F. Zito* and F.-A. Wollman* Departments of Molecular Biology and Plant Biology, University of Geneva, Geneva, Switzerland, IBPC, Paris, France


In photosynthetic cells of higher plants and algae, the distribution of light energy between photosystem I and photosystem II is controlled by light quality through a process called state transition. It involves a reorganization of the light-harvesting complex of photosystem II (LHCII) within the thylakoid membrane whereby light energy captured preferentially by photosystem II is redirected towards photosystem I or vice versa. State transition is correlated with the phosphorylation of several LHCII-proteins and requires the presence of functional cytochrome b6/f complex.We have isolated and characterized mutants of the unicellular alga Chlamydomonas reinhardtii which are deficient in state transition.

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