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The Effect of Temperature and Light on Gas Exchange and Acid Accumulation in the C3-CAM Plant Clusia minor L

HAAG-KERWER, ANGELA ; FRANCO, AUGUSTO C. ; LUTTGE, ULRICH

Journal of experimental botany, 1992-03, Vol.43 (3), p.345-352 [Periódico revisado por pares]

OXFORD: Oxford University Press

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  • Título:
    The Effect of Temperature and Light on Gas Exchange and Acid Accumulation in the C3-CAM Plant Clusia minor L
  • Autor: HAAG-KERWER, ANGELA ; FRANCO, AUGUSTO C. ; LUTTGE, ULRICH
  • Assuntos: Biological and medical sciences ; C. minor ; CAM ; Citrates ; citric acid ; Crassulacean acid metabolism ; Fundamental and applied biological sciences. Psychology ; Gas temperature ; Life Sciences & Biomedicine ; light intensity ; Metabolism ; Mitochondria ; Organic acids ; Photons ; Photosynthesis, respiration. Anabolism, catabolism ; Plant physiology and development ; Plant Sciences ; Plants ; Science & Technology ; Temperature gradients ; Water temperature ; Water vapor
  • É parte de: Journal of experimental botany, 1992-03, Vol.43 (3), p.345-352
  • Notas: ark:/67375/HXZ-GM0H66PP-M
    1 To whom correspondence should be addressed
    ArticleID:43.3.345
    istex:DBE4ABD53B9834D230BA64069759EA936854071A
  • Descrição: Gas exchange and organic acid accumulation of the C3-CAM intermediate Clusia minor L. were investigated in response to various day/night temperatures and two light regimes (low and high PAR). For both light levels equal day/night temperatures between 20°C and 30°C caused a typical C3 gas exchange pattern with all CO2 uptake occurring during daylight hours. A day/ night temperature of 15°C caused a negative CO2 balance over a 24 h period for low-PAR-grown plants while high-PAR-grown plants showed a CAM gas exchange pattern with most CO2 uptake taking place during the dark period. However, there was always a considerable night-time accumulation of malic acid which increased when the night-time temperature was lowered and had its maximum (54 mmol m−2) at day/night temperature of 30/15°C. A significant amount of malic acid accumulation (23 mmol m−2) in low-PAR-grown plants was observed only at 30/15°C. Recycling of respiratory CO2 in terms of malic acid accumulation reached between 2·0 and 21·5 mmol m−2 for high-PAR-grown plants while there was no significant recycling for low-PAR-grown plants. Both low and high-PAR-grown plants showed considerable night-time accumulation of citric acid. Indeed under several temperature regimes low-PAR-grown plants showed day/night changes in citric acid levels whereas malic acid levels remained approximately constant or slightly decreased. It is hypothesized that low and high-PAR-grown plants have different requirements for citrate. In high-PAR-grown plants, the breakdown of citrate prevents photoinhibition by increasing internal CO2 levels, whereas in low-PAR-grown plants the night-time accumulation of citric acid may function as an energy and carbon saving mechanism.
  • Editor: OXFORD: Oxford University Press
  • Idioma: Inglês
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