Plant Physiol. Journal of Pharmacology and Experimental Therapeutics
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Plant Physiology 47:504-509 (1971)
© 1971 American Society of Plant Biologists

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Articles

Mechanism of Auxin-induced Ethylene Production 1

Bin G. Kanga, William Newcomb2,b and Stanley P. Burgc

a The Fairchild Tropical Garden, Miami, Florida 33156, Department of Biology, University of Miami, Miami, Florida 33124, c Department of Biochemistry, University of Miami, Miami, Florida 33124

Indoleacetic acid-induced ethylene production and growth in excised segments of etiolated pea shoots (Pisum sativum L. var. Alaska) parallels the free indoleacetic acid level in the tissue which in turn depends upon the rate of indoleacetic acid conjugation and decarboxylation. Both ethylene synthesis and growth require the presence of more than a threshold level of free endogenous indoleacetic acid, but in etiolated tissue the rate of ethylene production saturates at a high concentration and the rate of growth at a lower concentration of indoleacetic acid. Auxin stimulation of ethylene synthesis is not mediated by induction of peroxidase; to the contrary, the products of the auxin action which induce growth and ethylene synthesis are highly labile.

2 Present address: Department of Biology, University of Saskatchewan, Saskatoon, Saskatchewan, Canada.

1 This work was supported by the National Science Foundation Grant GB-8322 to S. P. Burg.






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Copyright © 1971 by the American Society of Plant Biologists