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.
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Claims 9
Claim · model-written summary
Increasing external NaCl suppressed mung bean root elongation.
- Taxon
- mung bean
.jpg?width=60)
Vigna radiatae0 - Organ / stage
- rootse0
- Treatment
- increasing external concentrations of NaCle0
- Outcome
- elongatione0
- Direction
- suppressione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“With increasing external concentrations of NaCl, mung bean roots showed suppression of elongation and a decrease in the intracellular concentration of K+”
Claim · model-written summary
Increasing external NaCl decreased intracellular K+ concentration in mung bean roots.
- Taxon
- mung beanVigna radiatae0
- Organ / stage
- rootse0
- Treatment
- increasing external concentrations of NaCle0
- Outcome
- intracellular concentration of K+e0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With increasing external concentrations of NaCl, mung bean roots showed suppression of elongation and a decrease in the intracellular concentration of K+”
Claim · model-written summary
External Ca2+ alleviated inhibition of mung bean root elongation under high NaCl stress.
- Taxon
- Mung BeanVigna radiatat0
- Treatment
- Addition of Ca2+ to the external mediume0
- Outcome
- root elongatione0
- Direction
- alleviatede0
- Qualifier
- under the high NaCl stresse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Addition of Ca2+ to the external medium alleviated the inhibition of root elongation under the high NaCl stress”
t0“Intact Mung Bean Roots”
Claim · model-written summary
External Ca2+ maintained high intracellular K+ in the elongating root region.
- Taxon
- Mung BeanVigna radiatat0
- Organ / stage
- elongating region of the rootse0
- Treatment
- Addition of Ca2+ to the external mediume0
- Outcome
- intracellular concentration of K+e0
- Direction
- maintained a highe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“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”
t0“Intact Mung Bean Roots”
Claim · model-written summary
The calcium countereffect against NaCl stress correlated with external [Ca2+]/[Na+]2 ratio.
- Taxon
- Mung BeanVigna radiatat0
- Treatment
- ratio of [Ca2+]/[Na+]2 in the external mediume0
- Outcome
- counter effect of Ca2+ against the NaCl stress on rootse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This counter effect of Ca2+ against the NaCl stress on roots was correlated with the ratio of [Ca2+]/[Na+]2 in the external medium”
t0“Intact Mung Bean Roots”
Claim · model-written summary
An external [Ca2+]/[Na+]2 ratio above 5.0 × 10−4 mM−1 gave almost complete recovery of root elongation under high NaCl.
- Taxon
- Mung BeanVigna radiatat0
- Outcome
- root elongatione0
- Direction
- recoverye0
- Value
- 5.0 × 10−4 mM−1e0
- Qualifier
- under various high concentrations of NaCle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A value above 5.0 × 10−4 mM−1 resulted in almost complete recovery of root elongation under various high concentrations of NaCl”
t0“Intact Mung Bean Roots”
Claim · model-written summary
Root elongation during 24 hours of NaCl stress correlated with intracellular K+ above 10 mM.
- Taxon
- Mung BeanVigna radiatat0
- Treatment
- NaCl stresse0
- Outcome
- Root elongatione0
- Value
- 10 mMe0
- Qualifier
- intracellular concentration of K+ was in excess of 10 mMe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“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”
t0“Intact Mung Bean Roots”
Claim · model-written summary
The authors interpret adequate root-cell K+ as essential for elongation under salt stress.
- Taxon
- Mung BeanVigna radiatat0
- Compound
- K+e0
- Outcome
- root elongatione0
- Qualifier
- under salt stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maintenance of an adequate concentration of K+ in root cells is essential for root elongation under salt stress”
t0“Intact Mung Bean Roots”
Claim · model-written summary
The authors infer that external Ca2+ prevents intracellular K+ leakage and thereby supports root elongation.
- Taxon
- Mung BeanVigna radiatat0
- Compound
- Ca2+e0
- Outcome
- elongation of rootse0
- Qualifier
- prevents the leakage of intracellular K+e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ca2+ prevents the leakage of intracellular K+ and thereby supports the elongation of roots under salt stress”
t0“Intact Mung Bean Roots”
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