Answer: The main reason is that the apple is wrinkled after bagging. The main reason is that the first expansion period of the apple fruit is short, and the growth stops early. After the bag is torn in the later stage, if the water is sufficient, the secondary expansion speed of the fruit will be accelerated. Due to the rapid division of the flesh cells, the pericarp cells divide slowly, and the difference in the rate of internal and external cell division leads to micro-cracking of the fruit. The fruit loses water after micro-cracking, which causes the fruit to shrink and become soft. In addition, calcium deficiency in fruits is also prone to this phenomenon.
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