The effect of abscisic acid on epidermal cells: protoplast swelling and ATPase activity

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5 Scopus citations

Abstract

Isolated epidermal protoplasts of Commelina communis L. increase in volume in the presence of KCl. Since this swelling is an osmotic phenomenon it reflects K+ influx. ATP slightly decreased the volume of the protoplasts, pointing towards the possibility that K+ uptake is passive. On the other hand abscisic acid (ABA) and sodium orthovanadate increased the swelling, and their effect was reversed by ATP. This may support the suggestion that ABA inhibits the active and ATPase‐mediated relase of K+ from epidermal cells. Mg2+‐dependent, K+‐stimulated ATPase activity was found in the microsomal fraction from epidermal cells. This activity was vandadate sensitive. ABA increased the basal activity in the presence of Mg2+ but inhibited the K+ stimulation.

Original languageEnglish
Pages (from-to)664-668
Number of pages5
JournalPhysiologia Plantarum
Volume66
Issue number4
DOIs
StatePublished - 1 Jan 1986

Keywords

  • Commelina communis
  • stomatal movement

ASJC Scopus subject areas

  • Physiology
  • Genetics
  • Plant Science
  • Cell Biology

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