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Flexibility of Crassulacean Acid Metabolism in Kalanchoe pinnata (Lam.) Pers. II. Light-use Characteristics of Plants Grown in Low or High Light

Lüttge, Ulrich ; Ball, Erika ; Fetene, Masresha

Journal of Plant Physiology, 1/1991, Vol.137(3), pp.268-272 [Periódico revisado por pares]

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  • Título:
    Flexibility of Crassulacean Acid Metabolism in Kalanchoe pinnata (Lam.) Pers. II. Light-use Characteristics of Plants Grown in Low or High Light
  • Autor: Lüttge, Ulrich ; Ball, Erika ; Fetene, Masresha
  • Assuntos: CO 2 -Recycling ; Crassulacean Acid Metabolism (Cam) ; Kalanchoe Pinnata ; Light-Use Characteristics ; Photoinhibition ; Cam ; Gh 2 O ; J ; L ; Δmal ; N ; Ppfd ; PS ; S ; Wue
  • É parte de: Journal of Plant Physiology, 1/1991, Vol.137(3), pp.268-272
  • Descrição: Plants of Kalanchoe pinnata (Lam.) Pers. were grown at high and low light intensity, i.e. at 26 and 2 mol photons m -2 day -1 respectively, and at two different regimes of nitrogen nutrition. Polarographic measurements of Orevolution in leaf disks of shade plants in comparison to high-light plants showed lower light-compensation points of photosynthesis (10 µmo1 photons m -2s -1 as compared to 22 µmol photons m -2 s -1), lower half-saturation points of photosynthesis, and high apparent photonyield of photosynthesis (0.111 mol O 2/mol photons as compared to 0.059 mol/mol for high-light plants when both were well supplied with H 2O and N). However, absolute rates of photosynthetic O 2-evolution near light-saturation were not very different in high-light and shade plants. If well-watered and N-supplied shade-grown plants were transferred to high-light conditions, total daynight net CO 2 uptake was much increased, particularly by stimulated CO 2-fixation during the light period, which continued even for 5 consecutive days in high light. Internal respiratory CO 2 recycling in the dark period, i.e. an indicator of stress in CAM plants, did not change during this time. This indicates that shade-grown plants were not photoinhibited in high-light.
  • Idioma: Inglês

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