Effect of Ca2+ on Na+ and Cl- uptake and transport in soybean [Glycine max] root under high NaCl stress
2000
Hanayama, S. (Yamagata univ., Tsuruoka (Japan). Faculty of Agriculture) | Kasubuchi, T. | Nakano, M.
Two experiments were conducted. Firstly, the quantity of Na(+) and Cl(-) contents in 5-day-old soybean roots were measured during the initial 9h when the roots were immersed in 50 mmol/l NaCl solution and 50 mmol/l NaCl solution with small amount of CaCl2 (0.5, 1.0 and 2.0 mmol/l). Secondly, suction (20kPa) was applied to the cross section of detopped soybean roots and the exudation collected for 9h and the volume was measured. The resulting, Na(+) content in the roots immersed in 50 mmol/l NaCl and 50 mmol/l NaCl + 0.5 mmol/1 CaCl2 solution for 9h was about 58 mu molg(-1)F.W. and 20 mu molg(-1)F.W., respectively. This implies that Ca(2+) controls the K channel of cell membranes in the roots. On the other hand, Ca(2+) did not effect Cl(-1) content in the roots. In addition, exudation volume was controlled osmotic pressure gradient between solution contained in the roots and the outside solution. if Ca(2+) could maintain the ion permeability of cell membrane under 50 mmol/l NaCl so
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