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Plant Physiology 51:1011-1014 (1973)
© 1973 American Society of Plant Biologists

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Articles

Mechanism of a Synergistic Effect of Kinetin on Auxin-induced Ethylene Production

Suppression of Auxin Conjugation 1

Oi-Lim Lau and S. F. Yang

a Department of Vegetable Crops, University of California, Davis, California 95616

In hypocotyl segments of mung bean (Phaseolus mungo L.) seedlings, exogenously supplied indoleacetic acid was rapidly conjugated mainly into indoleacetylaspartic acid, which was inactive in inducing ethylene production. Kinetin is known to stimulate indoleacetic acid-induced ethylene production. The mechanism of kinetin action on indoleacetic acid-induced ethylene production by hypocotyl segments of mung bean seedlings was studied in relation to indoleacetic acid uptake and indoleacetic acid metabolism. Kinetin enhanced indoleacetic acid uptake during the initial 2-hour incubation and markedly suppressed the conversion of indoleacetic acid to indoleacetic acid conjugates throughout the whole 7-hour incubation. As a result, there was more free indoleacetic acid and less conjugated indoleacetic acid in the segments treated with kinetin than in those receiving no kinetin. A close relationship was demonstrated between the rate of ethylene production and the level of free indoleacetic acid, which was regulated by kinetin.

1 This work was supported in part by National Science Foundation Grant GB-33907x.




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C. Coenen, M. Christian, H. Luthen, and T. L. Lomax
Cytokinin Inhibits a Subset of Diageotropica-Dependent Primary Auxin Responses in Tomato
Plant Physiology, April 1, 2003; 131(4): 1692 - 1704.
[Abstract] [Full Text] [PDF]


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Copyright © 1973 by the American Society of Plant Biologists