Phytochrome effects on K+ fluxes in guard cells of Commelina communis

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The effect of phytochrome on K+ transport in guard cells of Commelina communis L. was studied following stomatal movement and using the K+−channel blockers tetraethylammonium (TEA), Cs+ and quinidine. TEA and quinidine prevented stomatal opening and closure in red light, but not when it was supplemented with far‐red. This indicates that channels that can be blocked by TEA and quinidine are regulated by phytochrome. Evidence for a phytochrome effect on K+ leakage through other membranal compartments was also found. These phytochrome effects are modified by temperature. Elevated temperature decreases the involvement of channels and increases K+ transport through other membrane compartments, while low temperature causes channel opening and diminishes K+ leakage. The interaction between phytochrome effects and those of temperature is discussed.

Original languageEnglish
Pages (from-to)345-351
Number of pages7
JournalPhysiologia Plantarum
Issue number3
StatePublished - 1 Jan 1987


  • Commelina communis
  • TEA
  • guard cells
  • phytochrome
  • potassium channels
  • quinidine
  • stomatal movement


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