Abstract
This paper studies the relative importance of endogenous ABA and ion toxicity in the leaf growth inhibition caused by NaCl in salt‐adapted and unadapted bush beans. Adaptation to salt‐stress was achieved by germination of seeds in 75 m M NaCl, while unadapted plants were germinated in tap water. The adaptation process caused a transitory increase in leaf ABA, Na + and Cl − concentrations, while leaf expansion was inhibited. However, when grown for 8 or 13 days in 75 m M NaCl‐containing nutrient solution, primary and first trifoliolate leaves of salt‐adapted plants had greater areas than those of unadapted plants. Concentrations of ABA, Na + and Cl − in these leaves were lower in adapted plants, and a strong negative correlation between leaf expansion growth and either leaf Na + , Cl − or ABA concentrations could be established. However, in the second trifoliolate leaves only the ABA, but not the Na + or Cl − , concentrations were significantly correlated with leaf expansion. Our results suggest that salt‐induced inhibition of leaf expansion growth in bush beans is mediated by ABA rather than Na + or Cl − toxicity. Moreover, the increase of ABA, induced by the salt‐pretreatment, seems to play an important role in limiting the accumulation of Na + and Cl − in the leaves, leading to adaptation of bush beans to salt‐stress.
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Claims 9
Claim · model-written summary
Salt adaptation transiently increased leaf ABA, sodium and chloride concentrations.
- Taxon
- bush beant0
- Treatment
- adaptation processe0
- Outcome
- leaf ABA, Na + and Cl − concentrationse0
- Direction
- increaseinferrede0
Not reportedComparator
Verbatim
e0“The adaptation process caused a transitory increase in leaf ABA, Na + and Cl − concentrations”
t0“Endogenous abscisic acid levels are linked to decreased growth of bush bean plants treated with NaCl”
Claim · model-written summary
Salt adaptation inhibited leaf expansion transiently.
Not reportedComparator
Verbatim
e0“while leaf expansion was inhibited”
t0“Endogenous abscisic acid levels are linked to decreased growth of bush bean plants treated with NaCl”
Claim · model-written summary
Adapted plants had larger primary and first trifoliolate leaves than unadapted plants after 8 or 13 days in saline nutrient solution.
Verbatim
e0“when grown for 8 or 13 days in 75 m M NaCl‐containing nutrient solution, primary and first trifoliolate leaves of salt‐adapted plants had greater areas than those of unadapted plants”
t0“Endogenous abscisic acid levels are linked to decreased growth of bush bean plants treated with NaCl”
Claim · model-written summary
Adapted leaves had lower ABA, sodium and chloride concentrations.
Verbatim
e0“Concentrations of ABA, Na + and Cl − in these leaves were lower in adapted plants”
t0“Endogenous abscisic acid levels are linked to decreased growth of bush bean plants treated with NaCl”
e1“those of unadapted plants”
Claim · model-written summary
Leaf expansion was negatively correlated with sodium, chloride and ABA concentrations.
Verbatim
e0“a strong negative correlation between leaf expansion growth and either leaf Na + , Cl − or ABA concentrations could be established”
t0“Endogenous abscisic acid levels are linked to decreased growth of bush bean plants treated with NaCl”
Claim · model-written summary
Only ABA concentration was significantly correlated with expansion of second trifoliolate leaves.
Not reportedDirection
Verbatim
e0“in the second trifoliolate leaves only the ABA, but not the Na + or Cl − , concentrations were significantly correlated with leaf expansion”
t0“Endogenous abscisic acid levels are linked to decreased growth of bush bean plants treated with NaCl”
Claim · model-written summary
Sodium and chloride concentrations were not significantly correlated with expansion of second trifoliolate leaves.
Not reportedDirection
Verbatim
e0“in the second trifoliolate leaves only the ABA, but not the Na + or Cl − , concentrations were significantly correlated with leaf expansion”
t0“Endogenous abscisic acid levels are linked to decreased growth of bush bean plants treated with NaCl”
Claim · model-written summary
The authors suggest ABA mediates salt induced inhibition of leaf expansion.
Verbatim
e0“salt‐induced inhibition of leaf expansion growth in bush beans is mediated by ABA rather than Na + or Cl − toxicity”
Claim · model-written summary
The authors suggest salt pretreatment induced ABA limits sodium and chloride accumulation in leaves.
Verbatim
e0“the increase of ABA, induced by the salt‐pretreatment, seems to play an important role in limiting the accumulation of Na + and Cl − in the leaves”
t0“Endogenous abscisic acid levels are linked to decreased growth of bush bean plants treated with NaCl”
The same questions in other papers
sodium chloride · growth · Phaseolus vulgaris (common bean)Results differ
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- positive
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