Plant Physiol.
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Plant Physiology 43:1375-1379 (1968)
© 1968 American Society of Plant Biologists

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Articles

Does Ethylene Mediate Root Growth Inhibition by Indole-3-Acetic Acid?

W. A. Andreae1, M. A. Venis, F. Jursic and T. Dumas

Research Institute, Canada Agriculture, University Sub. P. O., London, Ontario, Canada

The effects of ethylene and of indole-3-acetic acid (IAA) on growth of excised pea root sections have been compared under a variety of conditions. After 16 hours treatment the inhibitory action of IAA is fully reversible on transfer of the root sections to IAA-free solutions. In contrast, inhibition by ethylene is almost totally irreversible. IAA inhibits growth from zero time; ethylene is generally without effect during the first 3 to 6 hours. The inhibitory action of ethylene is dependent on factors such as tissue age and solution composition which have no major effect on IAA inhibition. Ethylene production is enhanced by 100 µM IAA, but conditions which reduce the rate of ethylene evolution 2 to 3-fold at the same IAA concentration fail to affect the inhibitory action of IAA on elongation. It seems unlikely that ethylene can play more than a minor role in mediating inhibition of pea root growth by IAA.

1 Deceased.




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Copyright © 1968 by the American Society of Plant Biologists