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Changes of water-relation characteristics and levels of organic cytoplasmic solutes during salinity induced transition of Mesembryanthemum crystallinum from C-photosynthesis to crassulacean acid metabolism

Heun, Anne-Marie ; Gorham, John ; Lüttge, Ulrich ; Wynjones, R Gareth

Oecologia, August 1981, Vol.50(1), pp.66-72 [Periódico revisado por pares]

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  • Título:
    Changes of water-relation characteristics and levels of organic cytoplasmic solutes during salinity induced transition of Mesembryanthemum crystallinum from C-photosynthesis to crassulacean acid metabolism
  • Autor: Heun, Anne-Marie ; Gorham, John ; Lüttge, Ulrich ; Wynjones, R Gareth
  • Assuntos: Biology ; Ecology
  • É parte de: Oecologia, August 1981, Vol.50(1), pp.66-72
  • Descrição: NaCl was added to the nutrient solution of 4-6-week old Mesembryanthemum crystallinum plants so that the concentration rose by 50 mM per day. Ten to fifteen days after a concentration of 400 mM was reached, pronounced diurnal oscillations of malate levels indicated that plants had changed from C-photosynthesis to crassulacean acid metabolism (CAM). Due to the NaCl-treatment the solute potential (Ψ) decreased from about -6 bar to -25 bar, and the water potential (Ψ) changed from about -5 bar to -23 bar on average. Ψ showed small diurnal oscillations both in controls and NaCl-treated plants, with an amplitude of 1 to 3 bar, the value at the end of the dark phase being less negative than that at the end of the light phase. Changes of ion levels due to the NaCl-treatment were average increases in Na and Cl from 10-20 to 370-470 mmol kg FW and from below 10 to 280-325 mmol kg FW, respectively, and a decrease in K from 70-80 to 25 mmol kg FW. These changes of ion levels corresponded very closely...
  • Idioma: Inglês

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