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Ecophysiological comportment of the tropical C3/CAM-intermediate tree Clusia rosea in the field as assessed by analyses of stable carbon- and hydrogen-isotope ratios

Lüttge, Ulrich ; Ziegler, Hubert ; Ting, Irwin P.

Journal of Plant Physiology, 10/1993, Vol.142(4), pp.497-501 [Periódico revisado por pares]

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  • Título:
    Ecophysiological comportment of the tropical C3/CAM-intermediate tree Clusia rosea in the field as assessed by analyses of stable carbon- and hydrogen-isotope ratios
  • Autor: Lüttge, Ulrich ; Ziegler, Hubert ; Ting, Irwin P.
  • Assuntos: Clusia Rosea ; Ecophysiology ; Isotopes ; Other Angiosperms ; Carbon ; Hydrogen ; Carbon ; Hydrogen
  • É parte de: Journal of Plant Physiology, 10/1993, Vol.142(4), pp.497-501
  • Descrição: Grown-up trees of C. rosea (girths larger than 7 cm, heights taller than 2 m) in the Virgin Islands have a strong component of nocturnal CAM-type CO sub(2) fixation as indicated by their delta super(13)C values of ) 18 ppt reaching up to the low end of the range typical for CAM (-9 to -18ppt). Seedlings (girths up to 3.5 cm and heights up to 1.2 m) have a smaller but still notable CO sub(2)-dark fixation as suggested by delta super(13)C values of ) 21 to ) 26 ppt and only very small seedlings appear to be exclusively C sub(3) ( delta super(13)C = -29ppt). The larger variation of delta super(13)C-values among seedlings suggests that seedlings make more flexible use of the options of CO sub(2) dark- and light-fixation than adult trees, while the larger variation of delta D-values among trees supports the conclusion, that overall the trees are more flexible in their use of water in transpiration. More negative values of delta super(13)C and delta D in terrestrial plants as compared to their epiphytic sympatriotes suggest that the ratio of dark fixation to light fixation of CO sub(2) is smaller in terrestrial plants and that epiphytic plants transpire more of the water available to them. Leaf-N levels support the assumption of a better supply of the terrestrial plants. The analyses of stable isotopes and leaf-N levels, which are very suitable for screening in the field, corroborate the high ecophysiological flexibility of C. rosea as shown by more elaborate experimental approaches in the laboratory and in the field.
  • Idioma: Inglês

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