Abscisic acid decreases leaf Na+ exclusion in salt-treated Phaseolus vulgaris L.

Catalina Cabot, John V. Sibole, Joan Barceló, Charlotte Poschenrieder

Research output: Contribution to journalArticleResearchpeer-review

47 Citations (Scopus)

Abstract

Previous results showed that in short-term NaCl-treated beans increased leaf abscisic acid (ABA) concentration was triggered by Na+ but not by Cl-. In this work, the specificity of ABA signaling for Na + homeostasis was studied by comparing the plant's responses to solutions that modified accumulation of ABA and/or Na+ uptake and distribution, such as supplemental Ca2+, increased nutrient strength, different isosmotic composition, application of exogenous ABA, fluridone (an ABA inhibitor) and aminooxiacetic acid (AOA, an ethylene inhibitor). After fluridone pretreatment, salt-treated beans had lower Na+ uptake and higher leaf Na+ exclusion capacity than non-pretreated plants. Moreover, Na+ uptake was increased and leaf Na+ exclusion was decreased by AOA and ABA. NaCl and KCl similarly increased leaf ABA and decreased transpiration rates, whereas supplemental Ca2+ and increased strength nutrient solution decreased leaf ABA and leaf Na+. These results show (1) a non-ion-specific increase in ABA that probably signaled the osmotic component of salt, and (2) increased ABA levels that resulted in higher leaf Na+ concentrations due to lower Na + exclusion or increased root-shoot Na+ translocation. © 2009 Springer Science+Business Media, LLC.
Original languageEnglish
Pages (from-to)187-192
JournalJournal of Plant Growth Regulation
Volume28
DOIs
Publication statusPublished - 1 Jun 2009

Keywords

  • Abscisic acid
  • Aminooxiacetic acid
  • Bean
  • Ethylene
  • Fluridone
  • Na exclusion +
  • Phaseolus
  • Salinity

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