Are apples available all year round? Why do apples turn brown?

Apple is the fruit of the genus Malus in the Rosaceae family. It is not only the most important fruit in my country, but also the most widely planted and produced fruit in the world. In my country, apples are mainly produced in North China and Northeast China. They are picked when they are ripe in summer and autumn, and washed and used fresh or sliced ​​and dried. So are apples available all year round? Why do apples turn yellow-brown? Let's take a look at the introduction of Encyclopedia Knowledge Network below!

Contents of this article

1. Are apples available all year round?

2. Why do apples turn brown?

3. Apple Ripening Principle

Are apples available all year round?

Apples are available all year round, and people can basically buy and eat fresh apples most of the time of the year. There are many varieties of apples, and some artificially improved apple varieties are not easily affected by the seasons in terms of planting conditions. Different varieties of apples can be planted and harvested all year round.

Why do apples turn brown?

This is mainly due to the oxidation of apples. The apples we usually eat contain substances such as fruit acid and malic acid. If the apples are left in the air for a long time, these substances in the apples will react with the oxygen in the air, and this process is called oxidation. The oxidized apples will turn yellow-brown.

Apple Ripening Principle

The principle of apple ripening is to use ethylene and other similar substances to ripen apples. Among the five major plant hormones, ethylene is produced by fruits and has the function of ripening. Currently, artificially produced ripening agents include ethephon, 2-chloroethylphosphonic acid, etc., which can release ethylene and have a ripening effect. When the fruit is ripe, it activates phosphatase and other related enzymes to promote fruit ripening.