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Upsurge in Respiration and Peroxide Formation in Potato Tubers as Influenced by Ethylene, Propylene, and Cyanide

^a Department of Horticulture and Forestry, Rutgers—The State University of New Jersey, New Brunswick, New Jersey 08903

A continuous application of ethylene (10 µl/l) and propylene (500 µl/l) to potato tubers (Solanum tuberosum L.) resulted in an upsurge of respiration and a concomitant rise in peroxides. When applied in 100% O₂, the effect of ethylene and propylene on respiration and peroxide formation was augmented. Hydrogen cyanide (500 µl/l) mimicked the action of ethylene and propylene inducing a respiratory rise and a corresponding increase in peroxides. As with ethylene, the effect of HCN was augmented in high O₂ tensions. The results support the suggestion that ethylene activates the cyanide-insensitive respiratory pathway.