Carbon dioxide assimilation during postharvest removal of astringency from persimmon fruit.
Fruits (cv. Triumph) held in a CO2 or N2 atmosphere for 48 h to remove astringency, produced equal amounts of ethanol, but CO2-treated fruits produced 3-6 times more acetaldehyde than N2-treated fruits. 14CO2 supplied in the CO2 atmosphere was incorporated mainly into malate, with little incorporation into carbohydrates or amino acids. Application of malate or pyruvate to pulp discs of astringent fruits caused an immediate increase in acetaldehyde production. The results show that fruit tissue is capable of assimilating atmospheric CO2 by dark CO2 fixation involving malate or pyruvate decarboxylase.