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
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Research Support, U.S. Gov't, Non-P.H.S.
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Research Support, U.S. Gov't, P.H.S.
MeSH terms
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Dose-Response Relationship, Drug
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Gravitation
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Gravitropism / drug effects
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Gravitropism / physiology*
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Helianthus / drug effects
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Helianthus / growth & development
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Helianthus / physiology*
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Hypocotyl / drug effects
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Hypocotyl / growth & development*
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Hypocotyl / physiology*
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Indoleacetic Acids / pharmacology
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Indoleacetic Acids / physiology*
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Plant Shoots / drug effects
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Plant Shoots / growth & development*
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Plant Shoots / physiology
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Rotation
Substances
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Indoleacetic Acids
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indoleacetic acid