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Water relations of the epidermal bladder cells of the halophytic species Mesembryanthemum crystallinum : Direct measurements of hydrostatic pressure and hydraulic conductivity

Steudle, Ernst ; Lüttge, Ulrich ; Zimmermann, Ulrich

Planta, 1975, Vol.126(3), pp.229-246 [Periódico revisado por pares]

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  • Título:
    Water relations of the epidermal bladder cells of the halophytic species Mesembryanthemum crystallinum : Direct measurements of hydrostatic pressure and hydraulic conductivity
  • Autor: Steudle, Ernst ; Lüttge, Ulrich ; Zimmermann, Ulrich
  • Assuntos: Botany
  • É parte de: Planta, 1975, Vol.126(3), pp.229-246
  • Descrição: Water exchange between the bladder cells of stems of the halophytic species Mesembryanthemum crystallinum and the subepidermal cortical cell layers was determined by direct cell turgor pressure measurements using a pressure probe. Treating the system bladder cell/subepidermal cortex as two homogeneous elastic compartments the hydraulic conductivity, L p , of the barrier separating both compartments was found to be L p =2·10 -6 cm ·s -1 ·bar -1 . As discussed, this value essentially reflects the hydraulic conductivity of the bladder cell membrane, which is unusually high compared with the values expected for higher plant cells. The L p -values did not show a dependence on cell turgor pressure over a large pressure range (0.1 to 6 bar) nor on the salinity of the bladder sap (osmolarity range: 500 to 1700 mOsmol). Furthermore, the stationary pressure-values obtained in the pressure-flow experiments point to unusually high permeabilities of the bladder membrane to electrolytes (KCl and NaCl). The unique transport properties of the bladder cell membrane for salt and water suggest a special physiological function of the bladders in the water economy of the plant. It is assumed that the bladders form a reservoir for salts and water in the plant which upon osmotic stress acts as a buffering system to protect the photosynthetic tissue from osmotic injury.
  • Idioma: Inglês

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