Protective effect of external Ca+ on elongation and the intracellular concentration of K+ in intact mung bean roots under high NaCl stress

Yoshiyuki Nakamura, Karo Tanaka, Eiji Ohta, Makoto Sakata

Research output: Contribution to journal › Article

50 Citations (Scopus)

Abstract

The effects of Ca2+ in the external medium on intact mung bean roots under high NaCl stress were investigated. With increasing external concentrations of NaCl, mung bean roots showed suppression of elongation and a decrease in the intracellular concentration of K+. Addition of Ca2+ to the external medium alleviated the inhibition of root elongation under the high NaCl stress and maintained a high intracellular concentration of K+ in the elongating region of the roots. This counter effect of Ca2+ against the NaCl stress on roots was correlated with the ratio of [Ca2+]/[Na+]2 in the external medium. A value above 5.0 × 10-4 mM-1 resulted in almost complete recovery of root elongation under various high concentrations of NaCl. Root elongation for 24 h under NaCl stress was correlated with the extent to which the intracellular concentration of K+ was in excess of 10 mM. Maintenance of an adequate concentration of K+ in root cells is essential for root elongation under salt stress. These findings indicate that Ca2+ prevents the leakage of intracellular K+ and thereby supports the elongation of roots under salt stress.

Original languageEnglish
Pages (from-to)815-821
Number of pages7
JournalPlant and Cell Physiology
Volume31
Issue number6
Publication statusPublished - 1990

Fingerprint

Mung Bean
Elongation
mung beans
protective effect
root growth
Salts
Roots
calcium
salt stress
Salt Stress
Vigna
effect
Bean
salt
Recovery
Leakage
leakage
Excess
Maintenance
cells

Keywords

  • Ca2+
  • Intracellular concentration of K+
  • Mung bean (Vigna mungo)
  • NaCl
  • Root elongation
  • Salt stress

ASJC Scopus subject areas

  • Statistics, Probability and Uncertainty
  • Applied Mathematics
  • Ecology
  • Cell Biology
  • Physiology
  • Plant Science

Cite this

Protective effect of external Ca+ on elongation and the intracellular concentration of K+ in intact mung bean roots under high NaCl stress. / Nakamura, Yoshiyuki; Tanaka, Karo; Ohta, Eiji; Sakata, Makoto.

In: Plant and Cell Physiology, Vol. 31, No. 6, 1990, p. 815-821.

Research output: Contribution to journal › Article

Nakamura, Y, Tanaka, K, Ohta, E & Sakata, M 1990, 'Protective effect of external Ca+ on elongation and the intracellular concentration of K+ in intact mung bean roots under high NaCl stress', Plant and Cell Physiology, vol. 31, no. 6, pp. 815-821.
Nakamura Y, Tanaka K, Ohta E, Sakata M. Protective effect of external Ca+ on elongation and the intracellular concentration of K+ in intact mung bean roots under high NaCl stress. Plant and Cell Physiology. 1990;31(6):815-821.
Nakamura, Yoshiyuki ; Tanaka, Karo ; Ohta, Eiji ; Sakata, Makoto. / Protective effect of external Ca+ on elongation and the intracellular concentration of K+ in intact mung bean roots under high NaCl stress. In: Plant and Cell Physiology. 1990 ; Vol. 31, No. 6. pp. 815-821.
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N2 - The effects of Ca2+ in the external medium on intact mung bean roots under high NaCl stress were investigated. With increasing external concentrations of NaCl, mung bean roots showed suppression of elongation and a decrease in the intracellular concentration of K+. Addition of Ca2+ to the external medium alleviated the inhibition of root elongation under the high NaCl stress and maintained a high intracellular concentration of K+ in the elongating region of the roots. This counter effect of Ca2+ against the NaCl stress on roots was correlated with the ratio of [Ca2+]/[Na+]2 in the external medium. A value above 5.0 × 10-4 mM-1 resulted in almost complete recovery of root elongation under various high concentrations of NaCl. Root elongation for 24 h under NaCl stress was correlated with the extent to which the intracellular concentration of K+ was in excess of 10 mM. Maintenance of an adequate concentration of K+ in root cells is essential for root elongation under salt stress. These findings indicate that Ca2+ prevents the leakage of intracellular K+ and thereby supports the elongation of roots under salt stress.

AB - The effects of Ca2+ in the external medium on intact mung bean roots under high NaCl stress were investigated. With increasing external concentrations of NaCl, mung bean roots showed suppression of elongation and a decrease in the intracellular concentration of K+. Addition of Ca2+ to the external medium alleviated the inhibition of root elongation under the high NaCl stress and maintained a high intracellular concentration of K+ in the elongating region of the roots. This counter effect of Ca2+ against the NaCl stress on roots was correlated with the ratio of [Ca2+]/[Na+]2 in the external medium. A value above 5.0 × 10-4 mM-1 resulted in almost complete recovery of root elongation under various high concentrations of NaCl. Root elongation for 24 h under NaCl stress was correlated with the extent to which the intracellular concentration of K+ was in excess of 10 mM. Maintenance of an adequate concentration of K+ in root cells is essential for root elongation under salt stress. These findings indicate that Ca2+ prevents the leakage of intracellular K+ and thereby supports the elongation of roots under salt stress.

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