Nutritional value of Boletus
Boletus albus is delicious and nutritious. It is a famous edible fungus in the world because of its large cell, fat meat, strong handle, sweet and delicious taste and rich nutrition. Western European countries also have a widespread habit of eating Boletus. In addition to fresh vegetables, most of them are sliced and dried, and processed into various small packages, which are used to prepare soup or soy sauce extract, and also made into salted products for consumption. The cap is flat and semi spherical, smooth, non sticky, light naked color, white mushroom meat, with sauce flavor, can be used as medicine. It is one of the most delicious wild edible mushrooms. It can be exported to Europe, America, Japan and other countries. It is very popular with foreign businessmen. It is a famous edible fungus in the world because of its large cell, fat meat, strong handle, sweet and delicious taste and rich nutrition. Boletus are distributed in all parts of Yunnan Province, and the production period is from June to October every year. Temperature is an important index affecting the occurrence of Boletus edulis. Conversely, temperature is determined by many factors (slope, aspect, altitude). Temperature also affects the humidity, and humidity also affects the occurrence of Boletus edulis. The mycelium of Boletus edulis grows at 18 ℃ ~ 30 ℃, but the optimum temperature is 24 ℃ ~ 28 ℃; the fruiting body can grow and develop in the range of 5 ℃ ~ 28 ℃. The suitable temperature for fruiting body formation is 16 ℃ ~ 24 ℃. It is not easy to form fruiting body when the temperature is lower than 12 ℃. Boletus edulis is mainly concentrated in the altitude of 300m ~ 600m, and also grows at 200m or 700m above sea level, but the quantity is small. Because altitude is a sign factor of mountain climate, temperature, humidity, air, light intensity, soil and vegetation change with altitude. Soil is the substrate of Boletus edulis and its host plants. The structure, permeability and pH of soil are closely related to the growth of Boletus edulis. It was found that the soil around the producing area of Boletus edulis was generally mountain loess, yellow soil, gray sand soil, mountain yellow brown soil, dark brown soil, purple soil and yellow sand soil, especially in the thick, soft and fertile soil layer of litter, the growth of Boletus edulis was better. It is most favorable for the formation of fruiting bodies when it is rainy or sunny in the daytime or rainy at night, but it is not conducive to the formation of fruiting bodies in the environment of little rain and low humidity. The soil moisture content of mycelium growth stage is about 60%, while the relative humidity of fruiting body growth stage is 80% ~ 90%. According to the analysis, 100 g dry product contains protein 20.2 g, carbohydrate 64.2 g, heat 338 kcal, ash 4.0 g, calcium 23 mg, phosphorus 500 mg, iron 50 mg, riboflavin 3.68 mg. It has the functions of clearing away heat and relieving vexation, nourishing blood, chasing wind and dispersing cold, relaxing tendons and blood, tonifying deficiency and invigorating spirit, etc. traditional Chinese medicine believes that it has effects on anemia, body deficiency, dizziness and tinnitus. It is one of the raw materials of Chinese patent medicine "Shujin pill"; it is also a good gynecological medicine, which can treat women's leucorrhea and infertility. In addition, the water extract could inhibit the growth of sarcoma S-180 in mice. The inhibition rate of sarcoma S-180 and Ehrlich ascites carcinoma was 100% and 90% respectively. At the same time, it has the function of anti influenza virus and prevention and treatment of cold. Boletus is the general name of Boletaceae and Boletaceae, and most of them are edible except a few of them are poisonous or bitter. Boletus contains 8 kinds of essential amino acids for human body. It also contains alkaloids such as adenine, choline and putrescine. It can be used medicinally to treat lumbocrural pain, numbness of hands and feet, and convulsion of limbs. It can also be used to treat abnormal leucorrhea in women. Boletus albus is a kind of rare fungus with complete functions and both food and medicine. Regular consumption of Boletus can significantly enhance immunity and improve microcirculation. Mycorrhizal fungi, including Boletus edulis, contribute more than food and medicine to human beings. They play an important role in maintaining ecological balance, promoting plant germination, disease resistance and stress resistance. However, most of the ectomycorrhizal fungi, including Boletus edulis, are difficult to grow on artificial medium, and even if they grow, it is difficult to identify their genetic relationship by traditional back grafting method, so it is not easy to obtain pure species. As for in vitro culture of fruiting bodies, it is a worldwide problem. The development and application of molecular biotechnology provide conditions and possibilities for the research and development of Boletus edulis.