Effect of asymmetric auxin application on Helianthus hypocotyl curvature

Plant Physiol. 1989;91(2):466-8. doi: 10.1104/pp.91.2.466.

Abstract

Indole-3-acetic acid was applied asymmetrically to the hypocotyls of sunflower (Helianthus annuus L.) seedlings. After 5 hours on a clinostat, auxin gradients as small as 1 to 1.3 produced substantial (more than 60 degrees) hypocotyl curvature. This result suggests the asymmetric growth underlying hypocotyl gravitropism can be explained by lateral auxin redistribution.

Publication types

  • Research Support, U.S. Gov't, Non-P.H.S.
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Dose-Response Relationship, Drug
  • Gravitation
  • Gravitropism / drug effects
  • Gravitropism / physiology*
  • Helianthus / drug effects
  • Helianthus / growth & development
  • Helianthus / physiology*
  • Hypocotyl / drug effects
  • Hypocotyl / growth & development*
  • Hypocotyl / physiology*
  • Indoleacetic Acids / pharmacology
  • Indoleacetic Acids / physiology*
  • Plant Shoots / drug effects
  • Plant Shoots / growth & development*
  • Plant Shoots / physiology
  • Rotation

Substances

  • Indoleacetic Acids
  • indoleacetic acid