Relative importance of osmotic-stress and ion-specific effects on ABA-mediated inhibition of leaf expansion growth in Phaseolus vulgaris

E. Montero, C. Cabot, C. H. Poschenrieder, J. Barcelo

Research output: Contribution to journalArticleResearchpeer-review

46 Citations (Scopus)

Abstract

The osmotic and ion-specific components of salt-induced inhibition of leaf expansion growth were investigated in beans grown from 12 h to several days in either NaCl-containing solution cultures, an isosmotic concentrated macronutrient solution, or a vermiculite-compost mixture with low Na+ but high Cl- availability. Inhibition of leaf expansion and leaf ABA increase was more intense in the NaCl than in the isosmotic macronutrient treatment. Root Na+ was highly correlated to inhibition of leaf expansion and leaf or xylem sap ABA. When Na+ was sequestered in soil, salinized plants showed no reduction in leaf expansion or ABA increase, regardless of the presence of high leaf Cl- concentrations. Stomatal conductance exhibited an exponential relationship with the reciprocal value of xylem sap ABA. Our results indicate that an ion-specific effect caused by Na+ in roots may account for an ABA-mediated reponse of both stomatal closure and leaf expansion inhibition.
Original languageEnglish
Pages (from-to)54-62
JournalPlant, Cell and Environment
Volume21
DOIs
Publication statusPublished - 1 Jan 1998

Keywords

  • ABA
  • Beans
  • Leaf expansion
  • Phaseolus vulgaris L.
  • Salt stress
  • Stomatal conductance

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