Agravitropic Growth and Its Relation to the Formation of the Plumular Hook in Etiolated Shoots of the Pea Mutant, Ageotropum

Hideyuki Takahashi, Hiroshi Suge, Mordecai J. Jaffe

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

Shoots of a pea mutant, ageotropum (Pisum sativum L.) exhibited agravitropic growth and less ability to form a plumular hook in the dark. Decapitated epicotyls of dark-grown ageotropum pea bent away from external IAA when applied to the cut-end asymmetrically. But symmetrical application of IAA to the entire cut-surface of the horizontally placed epicotyls could not induce gravitropic curvature. In horizontally placed epicotyls of dark-grown ageotropum pea, 3H label applied as 3HIAA moved basipetally but did not apparently move laterally. Seedlings of ageotropum pea formed the plumular hook to some extent in response to externally applied ethylene. Alaska (normal) epicotyls evolved 2 to 5 times more ethylene than ageotropum epicotyls. Gravistimulation of the shoots increased ethylene evolution in Alaska epicotyls but not in ageotropum epicotyls. These results suggest a positive correlation between auxin asymmetry and ethylene production, which may influence both shoot gravitropism and formation of the plumular hook.

Original languageEnglish
Pages (from-to)216-222
Number of pages7
JournalJournal of Plant Physiology
Volume138
Issue number2
DOIs
Publication statusPublished - 1991 Jan 1

Keywords

  • Alaska
  • Pisum sativum L. (pea)
  • ageotropum
  • auxin
  • ethylene
  • gravitropism
  • plumular hook

ASJC Scopus subject areas

  • Physiology
  • Agronomy and Crop Science
  • Plant Science

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