Document Detail

Plastid terminal oxidase (PTOX) has the potential to act as a safety valve for excess excitation energy in the alpine plant species Ranunculus glacialis L.
MedLine Citation:
PMID:  23301628     Owner:  NLM     Status:  Publisher    
R. glacialis leaves were tested for their PTOX content and electron flow to photorespiration and to alternative acceptors. In shade-leaves, the PTOX and NDH content were markedly lower than in sun-leaves. Carbon assimilation/light and C(i) response curves were not different in sun- and shade-leaves but photosynthetic capacity was the highest in sun-leaves. Based on calculation of the apparent specificity factor of Rubisco, the magnitude of alternative electron flow unrelated to carboxylation and oxygenation of Rubisco correlated to the PTOX content in sun- shade- and growth-chamber-leaves. Similarly, fluorescence induction kinetics indicated more complete and more rapid reoxidation of the plastoquinone pool in sun- than in shade-leaves. Blocking electron flow to assimilation, photorespiration and the Mehler reaction with appropriate inhibitors showed that sun-leaves were able to maintain higher electron flow and plastoquinone oxidation. The results suggest that PTOX can act as a safety valve in R. glacialis leaves under conditions where incident PFD exceeds the growth PFD and under conditions where the plastoquinone pool is highly reduced. Such conditions can occur frequently in alpine climates due to rapid light and temperature changes.
Constance Laureau; Rosine De Paepe; Gwendal Latouche; Maria Moreno-Chacón; Giovanni Finazzi; Marcel Kuntz; Gabriel Cornic; Peter Streb
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-10
Journal Detail:
Title:  Plant, cell & environment     Volume:  -     ISSN:  1365-3040     ISO Abbreviation:  Plant Cell Environ.     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-1-10     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9309004     Medline TA:  Plant Cell Environ     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
© 2013 Blackwell Publishing Ltd.
Université Paris-Sud 11, Ecologie, Systématique et Evolution, UMR-CNRS 8079, Bâtiment 362, 91405, Orsay cedex, France.
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