Document Detail

Effect of the respiratory activity on photoinhibition of the cyanobacterium Synechocystis sp.
MedLine Citation:
PMID:  16228329     Owner:  NLM     Status:  Publisher    
The influence of respiratory activity on photosynthesis in Synechocystis cells that had been exposed to high light intensity was studied using distinct conditions of nitrogen supply. The photoinhibitory rate of N-sufficient cells was not influenced by the presence of different nitrogen sources. In contrast, when N-starved cells were resupplied with ammonium, they were protected from photoinhibition. Although N-starved cells presented a higher rate of dark O(2) uptake than N-sufficient ones, the photoinhibitory rate increased in both cases after addition of sodium azide or sodium azide plus salicylhydroxamic acid in the photoinhibitory treatment. In the absence of the D(1) protein repair mechanism, photodamage to Photosystem II was faster in N-sufficient cells than in N-starved ones. Mitigation of photodamage disappeared when the respiratory activity of N-starved cells was partially suppressed by the addition of sodium azide or sodium azide and salicylhydroxamic acid. Our results suggest that electron flow through cyanobacterial terminal oxidases can assist Photosystem I in removing electrons from the reduced plastoquinone pool, thus contributing to both reopening of Photosystem II reaction centers and avoiding photogeneration of reactive oxygen species under photoinhibitory conditions.
L M Silva; C P Dos Santos; R M Chaloub
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Photosynthesis research     Volume:  68     ISSN:  1573-5079     ISO Abbreviation:  Photosyn. Res.     Publication Date:  2001  
Date Detail:
Created Date:  2005-10-17     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100954728     Medline TA:  Photosynth Res     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  61-9     Citation Subset:  -    
Departamento de Bioquímica, Instituto de Química, Universidade Federal do Rio de Janeiro, 21910-240, Rio de Janeiro, RJ, Brazil,
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