Symptoms and Prevention of low temperature chilling injury in Potato

During plant growth or during stem storage, if the air temperature or soil temperature is too low (above freezing point), the plant will produce chilling injury. The degree of chilling injury varies with the temperature. 1. The symptom of the leaf is in the seedling stage, and the leaf wilts and collapses rapidly after the plant is damaged by freezing. When the qi warms up, the affected area becomes flooded and browns after death. But if the plant is only damaged by scourge. the above symptoms will not occur. Chilling injury occurs in the seedling stage in early spring. The symptoms appeared at the top of the seedlings and appeared yellowish to light brown at the base of the young leaves. When the leaf primordium, stem primordium and organelles are damaged by cold, the symptoms will appear after the young leaves grow. The leaves developed only on one side, the young leaves curled irregularly and produced chlorotic spots, and the leaves were twisted. Sometimes mottled on the injured stem; necrotic spots may also appear on the young leaves. 2. Symptoms of tuber Tuber will suffer from chilling injury and freezing injury both in the field and during storage. After thawing, the tissue of frozen tubers gradually changed from white (or basic background color) to pink or red, until it became gray, brown or black. Frostbitten tissue quickly softens and decays. When the water evaporates, it becomes a calcareous residue. The transverse section of the cold-injured tuber showed reticular necrosis, which was a sign of phloem injury. Because the phloem is more sensitive to low temperature than the surrounding parenchyma cells. Reticular necrosis can cover the whole tuber, or it may only be distributed on the injured side. With the aggravation of cold injury, dark brown reward spots appear around the vascular bundle ring, which is usually more serious near the umbilical end, and the pink lesion inside the tuber may also be caused by cold injury. (3) the prevention of low temperature chilling injury can only take preventive measures for the harm caused by low temperature. We should pay attention to the changes in the weather in early spring. If you encounter a cold spell, you can smoke in the field at night, and you can also cover the plant with straw, green grass and so on. In addition, attention should be paid to the change of temperature in storage, and the tubers should be kept warm to prevent cold injury. Xue Shears of Xiangmusi Agricultural School in Heilongjiang Province