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Stress Ethylene Production and the Respiration Rate, Internal Atmosphere, Early Growth, and Yield of Ipomoea batatas Plants1


The internal atmosphere extracted from the basal 6 inches of sweet potato plants held for one minute at 48°C in tap water was higher in ethylene (C2H4) and oxygen (O2) and lower in carbon dioxide (CO2) than similar samples from untreated plant material. This increase in endogenous C2H4 content of treated sweet potato slips was accompanied by increases in respiration rate, early growth and total root yield at harvest. C2H4 content, respiration rate, early growth and yield appeared to be essentially quadratic functions of treatment time at 48°C. Maximum values for the above parameters occurred after treatment for 1 to 2 minutes at 48°C.