Abstract
The influence of fruit size, defoliation, preharvest gibberellin sprays, and growing regions on the ease of removal of astringency with postharvest treatment with ethanol vapor in Japanese persimmon ‘Hiratanenashi’ was studied. The fruits treated with varying concentrations of ethanol were kept individually in small plastic chambers.1. Astringency was more difficult to remove from small rather than large fruits when treated with the same amount of ethanol on a fresh weight basis. This is attributed probably to the smaller amount of acetaldehyde which was accumulated by small fruits than by large ones.2. Defoliation promoted skin color development and softening of the flesh during ethanol treatment. Defoliation had little effect on the rate of decrease in soluble tannins.3. Preharvest gibberellin spray increased fruit storability but had little effect on the rate of decrease in soluble tannins.4. Comparisons among fruits produced in several different regions of Japan for two years revealed that fruits grown in warmer regions lost their astringency and became softer a little more rapidly during ethanol treatment than did fruits grown in cooler areas.
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