Possible involvement of calmodulin in the regulation of ATPase activity in guard cells

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Abstract

Calcium ions play an important role in the regulation of stomatal movement and the mechanism underlying this action is yet to be determined. It is suggested that guard cell plasma membrane ATPase is a target for calcium action and that this effect is mediated by calmodulin. In this study, the effects of calcium and two calmodulin antagonists on ATPase activity in a crude homogenate of Commelina communis L. guard cell protoplasts were examined. The homogenate contained Mg2+‐dependent, K+‐simulated ATPase activity, which was inhibited by CaCl2 while stimulated by the calmodulin antagonists, compound 48/80 and chlorpromazine. The calmodulin antagonists partially reversed the inhibitory effect of calcium ions. The results support the possibility of calmodulin involvement in the regulation of guard cell ATPase activity by calcium ions.

Original languageEnglish
Pages (from-to)411-414
Number of pages4
JournalPhysiologia Plantarum
Volume94
Issue number3
DOIs
StatePublished - 1 Jan 1995

Keywords

  • ATPase
  • Commelina communis
  • calcium
  • calmodulin
  • chlorpromazine
  • compound 48/80
  • stomata

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