PHYSIOLOGICAL AND BIOCHEMICAL CHANGES DURING GROWTH AND DEVELOPMENT OF PERSIMMON FRUIT (DIOSPYROS KAKI L.) GROWN IN VIETNAM

Some biochemical changes according to the age of persimmon fruit grown in Vietnam were studied. The content of chlorophyll in persimmon peel reaches the highest value at 12 weeks old and decreases rapidly when the fruit is 22 weeks old, the content of carotenoids increase until the fruit is fully ripening. The content of vitamin C and reducing sugars increased continuously and reached the maximum value at 21 weeks old and then decreased slightly. Starch content gradually increases from the early stages and reaches its maximum at 15 weeks old, then decreases. Lipid content gradually increases from the early stages and reaches its maximum at 18 weeks old, then decreases. The content of protein decreased continuously from formation to fruit ripening. Based on the results of the research, we found that at week 21 the nutritional value of the fruit is the best, so persimmon fruit should be harvested at this time to ensure the nutritional value during storage.

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