Stem CO2 release under illumination: corticular photosynthesis, photorespiration or inhibition of mitochondrial respiration? (Articolo in rivista)

Type
Label
  • Stem CO2 release under illumination: corticular photosynthesis, photorespiration or inhibition of mitochondrial respiration? (Articolo in rivista) (literal)
Anno
  • 2006-01-01T00:00:00+01:00 (literal)
Alternative label
  • Wittmann C1; Pfanz H1; Loreto F2; Centritto M3; Pietrini F2; Alessio G2. (2006)
    Stem CO2 release under illumination: corticular photosynthesis, photorespiration or inhibition of mitochondrial respiration?
    in Plant, cell and environment (Print)
    (literal)
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  • Wittmann C1; Pfanz H1; Loreto F2; Centritto M3; Pietrini F2; Alessio G2. (literal)
Pagina inizio
  • 1149 (literal)
Pagina fine
  • 1158 (literal)
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  • Impact factor 2010: 5.145 (literal)
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  • 29 (literal)
Rivista
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  • 6 (literal)
Note
  • ISI Web of Science (WOS) (literal)
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  • 1Institute of Applied Botany, University of Duisburg-Essen, 45117 Essen, Germany, 2CNR - Istituto di Biologia Agroambientale e Forestale 3CNR - Atmospheric Pollution Institute, 00016 Monterotondo Scalo, Italy (literal)
Titolo
  • Stem CO2 release under illumination: corticular photosynthesis, photorespiration or inhibition of mitochondrial respiration? (literal)
Abstract
  • In illuminated stems and branches, CO2 release is often reduced. Many light-triggered processes are thought to contribute to this reduction, namely photorespiration, corticular photosynthesis or even an inhibition of mitochondrial respiration. In this study, we investigated these processes with the objective to discriminate their influence to the overall reduction of branch CO2 release in the light. CO2 gas-exchange measurements of young birch (Betula pendula Roth.) branches (< 1.5 cm) performed under photorespiratory (20% O-2) and non-photorespiratory (< 2%) conditions revealed that photorespiration does not play a pre-dominant role in carbon exchange. This suppression of photorespiration was attributed to the high CO2 concentrations (C-i) within the bark tissues (1544 +/- 227 and 618 +/- 43 mu mol CO2 mol(-1) in the dark and in the light, respectively). Changes in xylem CO2 were not likely to explain the observed decrease in stem CO2 release as gas-exchange measurements before and after cutting of the branches did not effect CO2 efflux to the atmosphere. Combined fluorescence and gas-exchange measurements provided evidence that the light-dependent reduction in CO2 release can pre-dominantly be attributed to corticular refixation, whereas an inhibition of mitochondrial respiration in the light is unlikely to occur. Corticular photosynthesis was able to refix up to 97% of the CO2 produced by branch respiration, although it rarely led to a positive net photosynthetic rate. (literal)
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