Document Detail


Respiratory metabolism of illuminated leaves depends on CO2 and O2 conditions.
MedLine Citation:
PMID:  18184808     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Day respiration is the process by which nonphotorespiratory CO2 is produced by illuminated leaves. The biological function of day respiratory metabolism is a major conundrum of plant photosynthesis research: because the rate of CO2 evolution is partly inhibited in the light, it is viewed as either detrimental to plant carbon balance or necessary for photosynthesis operation (e.g., in providing cytoplasmic ATP for sucrose synthesis). Systematic variations in the rate of day respiration under contrasting environmental conditions have been used to elucidate the metabolic rationale of respiration in the light. Using isotopic techniques, we show that both glycolysis and the tricarboxylic acid cycle activities are inversely related to the ambient CO2/O2 ratio: day respiratory metabolism is enhanced under high photorespiratory (low CO2) conditions. Such a relationship also correlates with the dihydroxyacetone phosphate/Glc-6-P ratio, suggesting that photosynthetic products exert a control on day respiration. Thus, day respiration is normally inhibited by phosphoryl (ATP/ADP) and reductive (NADH/NAD) poise but is up-regulated by photorespiration. Such an effect may be related to the need for NH2 transfers during the recovery of photorespiratory cycle intermediates.
Authors:
Guillaume Tcherkez; Richard Bligny; Elizabeth Gout; Aline Mahé; Michael Hodges; Gabriel Cornic
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-01-09
Journal Detail:
Title:  Proceedings of the National Academy of Sciences of the United States of America     Volume:  105     ISSN:  1091-6490     ISO Abbreviation:  Proc. Natl. Acad. Sci. U.S.A.     Publication Date:  2008 Jan 
Date Detail:
Created Date:  2008-01-16     Completed Date:  2008-02-06     Revised Date:  2010-09-22    
Medline Journal Info:
Nlm Unique ID:  7505876     Medline TA:  Proc Natl Acad Sci U S A     Country:  United States    
Other Details:
Languages:  eng     Pagination:  797-802     Citation Subset:  IM    
Affiliation:
Plateforme Métabolisme-Métabolome, Institut Fédératif de Recherche 87, Bâtiment 630, 91405 Orsay Cedex, France. guillaume.tcherkez@u-psud.fr
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MeSH Terms
Descriptor/Qualifier:
Adenosine Diphosphate / chemistry
Adenosine Triphosphate / chemistry
Carbon Dioxide / metabolism*
Carbon Isotopes / chemistry
Cluster Analysis
Gene Expression Regulation, Plant*
Glycolysis
Light
Magnetic Resonance Spectroscopy
Oxygen / metabolism*
Oxygen Consumption*
Phosphorylation
Photosynthesis
Plant Leaves / metabolism*
Plant Physiological Phenomena
Chemical
Reg. No./Substance:
0/Carbon Isotopes; 124-38-9/Carbon Dioxide; 56-65-5/Adenosine Triphosphate; 58-64-0/Adenosine Diphosphate; 7782-44-7/Oxygen
Comments/Corrections

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