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`Beauregard' sweetpotato ( Ipomoea batatas  L. Lam) roots were maintained under different controlled atmospheres ranging from 0% to 21% O 2  at 22 °C in two separate trials for 14 days to study changes in activities of pyruvate decarboxylase (PDC) and alcohol dehydrogenase (ADH). Trial I showed no difference in activities of PDC and ADH between 0% and 1% O 2 , or among 2%, 5%, and 21% O 2 . Both PDC and ADH activities were significantly higher at 0% and 1% O 2  compared to the 2%, 5%, and 21% O 2  atmospheres. In trial II, both enzyme activities were lower at 1.5% O 2  than at 0% O 2 , but higher than at 10% and 21% O 2  atmospheres. The combined data of the two trials showed a very strong correlation between PDC and ADH activities ( R  2  = 0.86). In addition, a strong correlation existed between PDC activity and acetaldehyde concentration ( R  2  = 0.95). The maximal activities were at pH 6.5 for PDC and at pH 8.5 for ADH in the direction of acetaldehyde-to-ethanol. The results suggest that 1.5% O 2  is the critical point for the transition from aerobic to anaerobic metabolism in CA storage of sweetpotato roots, and PDC is the key enzyme in alcoholic fermentation.

406 Pyruvate Decarboxylase and Alcohol Dehydrogenase Activities in Sweetpotato under Different Oxygen Atmospheres