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Plant Physiology 56:826-829 (1975)
© 1975 American Society of Plant Biologists

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Articles

Effect of Gibberellic Acid, Kinetin, and Ethylene plus Carbon Dioxide on the Thermodormancy of Lettuce Seed (Lactuca sativa L. cv. Mesa 659) 1,2

Robert D. Keys, Orrin E. Smith3, Junji Kumamoto and Jessye L. Lyon

a Department of Plant Sciences, University of California, Riverside, California 92502

The effects of gibberellic acid and kinetin with ethylene plus carbon dioxide on the thermodormancy of lettuce seeds (Lactuca sativa L. cv. Mesa 659) at 35 C in the dark were studied. The combination of gibberellic acid plus kinetin with ethylene plus carbon dioxide was most effective in overcoming thermodormancy in these Great Lakes type seeds, alleviating any induced light requirement. Gibberellic acid action required at least a minimal level of ethylene plus carbon dioxide. Kinetin action was independent of ethylene plus carbon dioxide but interacted with the gases when the gases were added. A schematic representation of the interaction is presented.

3 Present address: Department of Horticulture, Washington State University, Pullman, Wash. 99163.

1 This work was supported in part by a grant from the Iceberg Lettuce Research Program.

2 This report is to be submitted as partial requirement for the Master of Sciences degree by the senior author.






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Copyright © 1975 by the American Society of Plant Biologists