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Effects of Kinetin, IAA, and Gibberellin on Ethylene Production, and Their Interactions in Growth of Seedlings ^1,2

Market Quality Research Division, Agricultural Research Service, Plant Industry Station, Beltsville, Maryland 20705

Kinetin in concentrations of 10^–8 to 10^–4 M, stimulated ethylene production in 3 and 4-day old etiolated seedlings of Alaska pea (Pisum sativum L. var. Alaska). Seedlings of other species responded similarly. The response to kinetin depended on the age of the seedlings.

Kinetin alone did not influence ethylene production in 6-day old stem sections, but it greatly increased the enhancing effect of IAA.

Gibberellic acid had no effect on ethylene production by pea seedlings during the first 6 days of growth. Ethylene and gibberellic acid are antagonistic in their effects on growth of the seedlings; ethylene interfered severely with the action of gibberellic acid but did not completely suppress it.

The inhibitors cycloheximide, cupferron, and N-ethylmaleimide, caused considerable inhibition of kinetin-induced ethylene production but were much less effective in the endogenous ethylene-forming system.

¹ Most of this material was included in a doctoral thesis submitted by Yoram Fuchs to the Graduate School of the University of Maryland, College Park, Maryland.

² Supported in part by National Science Foundation Grant GB-1094 and cooperative agreement between Market Quality Research Division, ARS, USDA, and Department of Botany, Agricultural Experiment Station, University of Maryland.

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