Photoregulation of Proton Extrusion by Cucumber Hypocotyls and the Role of ATPase Activity

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

The photoregulation of H+ extrusion by hypocotyl segments of Cucumis sativus L. was studied. Irradiation with red light (to give Pfr) enhanced H+ efflux in the presence of Mg2+ and K+. This effect of red light was decreased by far red irradiation (to give Pr). The acidification was inhibited by sodium orthovanadate. These results imply that H+ extrusion is coupled to plasma membrane ATPase activity. In vivo pretreatment with filipin, which interferes with phytochrome association with membranes, reduced both photoregulation of ATPase activity and H+ extrusion. A similar effect was found after preirradiation with red light before a prolonged dark period at 4 °C, a treatment which is assumed to lower phytochrome levels.

Original languageEnglish
Pages (from-to)329-336
Number of pages8
JournalJournal of Plant Physiology
Volume122
Issue number4
DOIs
StatePublished - 1 Jan 1986
Externally publishedYes

Keywords

  • ATP-ase
  • Acidification
  • Cucumis sativus
  • phytochrome
  • vanadate

Fingerprint

Dive into the research topics of 'Photoregulation of Proton Extrusion by Cucumber Hypocotyls and the Role of ATPase Activity'. Together they form a unique fingerprint.

Cite this