Photoacoustic studies on the dependence of state transitions on grana stacking

Photoacoustic detection of oxygen evolution and Emerson enhancement in state 1 and state 2 were compared in a tobacco wild type and mutant (Su/su) deficient in chlorophyll. The mutant shows smaller changes in the distribution of excitation energy between the two photosystems than the wild type. Anal...

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Bibliographic Details
Published in:Photosynthesis research 1990-09, Vol.25 (3), p.225-232
Main Author: Canaani, O. (Weizmann Inst. of Science, Rehovot (Israel). Biochemistry Dept.)
Format: Article
Language:English
Subjects:
CHLOROPHYLLE
CHLOROPHYLLS
CLOROFILAS
FOTOSINTESIS
MUTANT
MUTANTES
MUTANTS
NICOTIANA TABACUM
PHOTOSYNTHESE
PHOTOSYNTHESIS
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Summary:Photoacoustic detection of oxygen evolution and Emerson enhancement in state 1 and state 2 were compared in a tobacco wild type and mutant (Su/su) deficient in chlorophyll. The mutant shows smaller changes in the distribution of excitation energy between the two photosystems than the wild type. Analysis of Emerson enhancement saturation curves indicates that in the mutant which is deficient in grana partitions and shows less stacking, state 1-state 2 transitions reflect changes in the yield of energy transfer from PS II to PS I (spillover). On the other hand, the wild type containing large grana shows changes in absorption cross-sections of the two photosystems upon state transitions. NaF, a specific phosphatase inhibitor, blocks the transition to state 1, indicating that LHC II phosphorylation has a role in excitation energy regulation in both the mutant as well as the wild type. It is demonstrated that N-ethylmaleimide, a specific sulfhydryl reagent, blocks the transition to state 2, suggesting that a disulfide-sulfhydryl redox couple activates the LHC II kinase in vivo.
ISSN:0166-8595
1573-5079
DOI:10.1007/BF00033163