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An attempt is made to construct a carbon balance-sheet for carrot tissue respiring under nitrogen. It is shown that 97% of the carbon in the sugar consumed was recoverable in alcohol and carbon dioxide. The relative amounts of the two products agreed very closely with the requirements of the equation. C6H12O6→2C2H5OH+2CO2. The mean recoveries diverged by less than 1%. Neither of these small discrepancies was statistically significant. Not more than traces of plant acids, glycerol, acetaldehyde or phosphate esters appeared. It is suggested that the anaerobic respiration of young carrot tissue, unlike that of some other plant tissues, is a close approximation to an alcoholic fermentation, and proceeds without any considerable accumulation of intermediate or side products. Considerable contribution of any substance other than soluble sugars to the anaerobic production of carbon dioxide also seems to be excluded.
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James et al. (1955) studied this question.
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