Effect of asymmetric auxin application on Helianthus hypocotyl curvature.
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.
Migliaccio
F
F
Department of Biology, Yale University, New Haven, Connecticut 06511.
Rayle
D L
DL
D004305:Dose-Response Relationship, Drug; D006112:Gravitation; D018522:Gravitropism / Q000187:drug effects / Q000502:physiology*; D006368:Helianthus / Q000187:drug effects / Q000254:growth & development / Q000502:physiology*; D018546:Hypocotyl / Q000187:drug effects / Q000254:growth & development* / Q000502:physiology*; D007210:Indoleacetic Acids / Q000494:pharmacology / Q000502:physiology*; D018520:Plant Shoots / Q000187:drug effects / Q000254:growth & development* / Q000502:physiology; D012399:Rotation
D007210:Indoleacetic Acids; C030737:indoleacetic acid