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Interaction of Carbon Dioxide and Ethylene in Overcoming Thermodormancy of Lettuce Seeds

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

The combination of ethylene with CO₂ will completely overcome the thermodormancy of lettuce (Lactuca sativa L.) seeds at 35 C. This combination is effective if it is added to seeds either at the start or after several days of imbibition. The action of ethylene is dependent upon the CO₂ level present in the atmosphere surrounding the seeds. When CO₂ is trapped by KOH the ethylene effect is essentially nil.

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