Gibberellin-controlled pectinic acid and protein secretion in growing cells

Stephen C. Fry*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Gibberellic acid (GA) promoted cell expansion in a suspension culture of spinach. Preceding this response, weakly acidic pectinic acid was released into the medium. GA did not alter the concentration of sorbitol (0.7 M) needed to prevent growth, and sorbitol at this concentration did not block the action of GA upon the release of pectinic acid. GA suppressed the release into the medium of a peroxidase of MW ca 40 000 and favoured the intracellular accumulation of a polypeptide of similar MW. All the responses to GA were antagonized by 2,4-dichlorophenoxyacetic acid but not by kinetin. A hypothesis is presented in which the promotion of growth by GA is mediated by peroxidase, its phenolic substrates and the cell-wall pectic polysaccharides.

Original languageEnglish
Pages (from-to)735-740
Number of pages6
JournalPhytochemistry
Volume19
Issue number5
DOIs
Publication statusPublished - 1980

Keywords

  • cell-wall components
  • Chenopodiaceae
  • gibberellic acid
  • growth
  • pectinic acid
  • peroxidase
  • phenolic compounds
  • secretion
  • spinach
  • Spinacia oleracea
  • suspension culture

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