Differential proton secretion in the apical elongation zone caused by gravistimulation is induced by a signal from the root cap

Gabriele Brigitte Monshausen, H. E. Zieschang, A. Sievers

Research output: Contribution to journalArticle

35 Scopus citations

Abstract

The extracellular proton activity along primary roots of Phleum pratense L. was measured using proton-selective microelectrodes. Removal of the rout cap caused a reduction of the proton influx in the transitional region between the meristem and the apical elongation zone of the vertical root and inhibited the development of pH differences between the physically upper and lower flanks of the gravistimulated root. Disruption of the actin filament system of the root with 5 mmol m-3 cytochalasin D did not result in an altered proton flux and pH pattern compared with untreated vertical control roots, but inhibited the gravity-induced development of pH differences between the physically upper and lower root flanks as well as gravitropic curvature. These results provide evidence that pH changes following gravistimulation are induced by a signal transmitted from the root cap and that the actin filament system is involved in the gravity perception/transduction mechanism.

Original languageEnglish (US)
Pages (from-to)1408-1414
Number of pages7
JournalPlant, Cell and Environment
Volume19
Issue number12
DOIs
StatePublished - Jan 1 1996

All Science Journal Classification (ASJC) codes

  • Physiology
  • Plant Science

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