What is a virus-free potato?

What is a virus-free potato? What are the characteristics of virus-free potatoes? Please also know the netizens to help introduce the disadvantages of non-virus-free potatoes and the advantages of virus-free potatoes. The following details are listed for netizens' reference. The disadvantages of non-virus-free potato: potato has rich nutrition, short growth period, high yield and great economic benefit, but in production, potato is easy to be infected with a variety of viruses, such as light mosaic virus, stripe mosaic virus, wrinkle mosaic virus, mosaic virus and so on. after the virus invades the potato plant, it participates in the metabolism of potato and uses the nutrition of potato to replicate and multiply the virus. And through the accumulation of potato tubers generation by generation, the potato plant is dwarfed, the stem is thin and weak, the leaves lose green, curl or wrinkle, the potato block becomes smaller or deformed and the yield is reduced by 30-50%. The yield of seriously diseased fields can be reduced by 80%, and some plots even lose yield. Because there is no medicine that can only kill the virus in the potato plant without harming the potato, the only way is to use the potato stem tip tissue culture to remove the virus and obtain virus-free plants and seed potatoes. The production method of virus-free potato: because the cell division speed of potato stem tip is much faster than that of virus proliferation, the difference of this speed forms a virus-free zone of stem tip. At the same time, potato stem tip cells have a strong metabolism and have an advantage in the competition for the precursors of synthetic nucleic acid molecules, so it is difficult for the virus to obtain its own raw materials for replication. In addition, some components in potato stem tip meristem or culture medium can inhibit virus proliferation. Therefore, virus-free seedlings can be obtained by tissue culture of potato stem tip, and virus-free seed potatoes can be obtained by rapid propagation of virus-free seedlings. After detoxification, the potato has resumed its normal metabolic activities, giving full play to its original potential for increasing production, which is about 50% higher than that without detoxification, and the higher yield can be doubled. The results showed that the seedlings emerged 2-4 days earlier, the plants were strong, the leaves were hypertrophic and dark green, the photosynthetic efficiency was high, the number of tubers per plant increased by 50-70%, the weight of single potato increased by 50%, the root system was developed, the ability to absorb mineral nutrients was strong, and the ability to resist high temperature and drought was strong. The advantages of virus-free potato: after detoxification, the yield and quality of potato varieties were greatly improved, but the resistance of potato varieties to virus did not increase. Therefore, detoxification is not once and for all for the prevention and control of virus diseases. In the process of potato production and seed reproduction, if we do not pay attention to prevent the re-infection of the virus, the yield will decrease year by year. In general, most virus-free varieties were planted continuously for two years and four seasons, but the virus accumulated in the plant in the fifth season reached a higher concentration, and the plant showed obvious degeneration symptoms, which was almost similar to that before detoxification. Therefore, in potato production, one should pay attention to replacing new virus-free seedlings in a cycle of two years, and the other is to adopt various methods such as crop rotation and soil disinfection to reduce the accumulation of virus in the plant and slow down the degradation process of virus-free varieties. Potato slicing methods for prevention and control of potato late blight