Regulation of Mg, K-ATPase activity in guard cells of Commelina communis by phytochrome and ABA

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7 Scopus citations

Abstract

The microsomal fraction obtained from guard cell protoplasts was assayed for ATPase activity at pH 6.5. Triton X-100 did not affect this stimulation of activity of ATPase by K+ up to 5 mM, but the detergent abolished the stimulatory effect of K+ at higher concentrations. The ATPase activity was inhibited by N,N-dicyclohexylcarbodiimide and ABA. Irradiation with red light enhanced the ATPase activity more than did irradiation with far-red light. ABA and irradiation with red or far-red light were effective only in the presence of K+. These results suggest the possibility that the ATPase activity is modulated only indirectly by light and ABA.

Original languageEnglish
Pages (from-to)945-949
Number of pages5
JournalPlant and Cell Physiology
Volume30
Issue number7
DOIs
StatePublished - Oct 1989

Keywords

  • ABA
  • DCCD
  • K,Mg-ATPase
  • Phytochrome

ASJC Scopus subject areas

  • Physiology
  • Plant Science
  • Cell Biology

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