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Plant Physiology 80:1034-1037 (1986)
© 1986 American Society of Plant Biologists

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Articles

Interactions between Ethylene, CO2, and ABA on GA3-Induced Amylase Synthesis in Barley Aleurone Tissue 1

Forrest L. Tittle and Mary S. Spencer

Department of Plant Science, University of Alberta, Edmonton, Alberta, Canada T6G 2P5

Gibberellic acid-induced synthesis and release of {alpha}-amylase in barley aleurone tissue was inhibited by abscisic acid. This inhibition was relieved by simultaneous application of ethylene ranging in concentration from 0.1 to 100 microliters per liter. When CO2 was applied, it eliminated the effect of 0.1 microliter per liter ethylene and reimposed the abscisic acid inhibition. All concentrations of CO2 tested from 400 to 105 microliters per liter counteracted the effect of 0.1 microliter per liter ethylene, but had no observable effect on any higher concentration of ethylene. The results indicate that some processes necessary for embryo growth may be subject to regulation by ethylene and carbon dioxide at naturally occurring concentrations of the gases.

1 Financial assistance from the Natural Sciences and Engineering Research Council of Canada (Grant No. A-1451 to M. S. S.) is gratefully acknowledged.






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Copyright © 1986 by the American Society of Plant Biologists