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Plant Physiology 91:466-468 (1989)
© 1989 American Society of Plant Biologists

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Development and Growth Regulation

Effect of Asymmetric Auxin Application on Helianthus Hypocotyl Curvature 1

Fernando Migliaccio and David L. Rayle

Department of Biology, Yale University, P. O. Box 6666, New Haven, Connecticut 06511, Department of Biology and Molecular Biology Institute, San Diego State University, San Diego, California 92182

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.

1 Supported by a grant (NAGW 230) from the National Aeronautics and Space Administration to D. L. R.






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