Abstract
NaCl (0 to 274 mM) was added to the culture media of normal and habituated (auxin and cytokinin independent) sugarbeet calli and its effect on growth (estimated by the increase of dry and organic matters), water content and osmotic potential was tested. Growth of normal callus was stimulated by 68 mM NaCl after a lag period of two weeks. This callus tolerated up to 137 mM NaCl without growth reduction and maintained its hydric status by readjustment of its osmotic potential in 24 h. NaCl quantities under 34 mM stimulated growth of the habituated callus from the 3rd day on; higher NaCl concentrations (68 to 274 mM) inhibited growth or were lethal. NaCl sensitivity of this habituated callus was not due to its inability to adjust its osmotic potential: this adjustment occurred from the 4th h of culture whatever the media. From the 3rd day on, however, this callus presented a water deficit which depended on NaCl concentration. It is suggested that the lowering of osmotic potential corresponds to an important water loss in relation to changes in membrane permeability. This study finally shows that mechanisms of salt tolerance may have developed at the cellular level. Lower growth and lower salt tolerance of the habituated callus need further investigation in relation to cell structure and hormone autonomy.
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le Dily, F., Hagege, D., Billard, J.P. et al. Effet du Chlorure de Sodium sur la Croissance et le Potentiel Osmotique de Cals Normaux et Habitués de Betterave Sucrière. Biol Plant 32, 256–265 (1990). https://doi.org/10.1007/BF02886945
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DOI: https://doi.org/10.1007/BF02886945