Auxin changes both the extensibility and the yield threshold of the cell wall of vigna hypocotyls

Kiyoshi Nakahori, Kiyoshi Katou, Hisashi Okamoto

Research output: Contribution to journalArticle

47 Citations (Scopus)

Abstract

Elongation of plant stem is governed by two simultaneous processes: irreversible yielding of the cell wall and uptake of water. Among many candidates for the parameters that regulate and/ or restrict growth, we focused on the mechanical properties of the cell wall and determined those parameters that govern the process of IAA-induced growth by means of the pressure-jump method combined with the pressure-probe technique.The elongation growth of segments excised from the elongation zone of Vigna hypocotyls was accelerated by xylem perfusion with 10-4 M IAA. During the promotion of growth, both the extensibility (Φ) of the cell wall and the effective turgor (Pi-Y) increased while only a little or no change in the intracellular pressure (Pi) occurred.These results indicate that IAA increases not only the extensibility of the cell wall but also the effective turgor, I.e., the driving force for yielding of the cell wall. However, the driving force is not increased by the increase in Pi but by the decrease in the yield threshold (Y). These results suggest that Y is adjustable during the regulation of growth.

Original languageEnglish
Pages (from-to)121-129
Number of pages9
JournalPlant and Cell Physiology
Volume32
Issue number1
Publication statusPublished - Jan 1 1991
Externally publishedYes

Keywords

  • Auxin (IAA)
  • Cell-wall yield threshold
  • Effective turgor
  • Pressure probe
  • Pressure-jump method
  • Vigna hypocotyl

ASJC Scopus subject areas

  • Physiology
  • Plant Science
  • Cell Biology

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