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Edible forest mushrooms are one of the most important non−wood products and their economic importance is constantly growing. Only in Poland, the value of collected mushroom is estimated to about 740 million PLN a year. Such species as Boletus sp., Lactarius sp. or Tuber sp. are the most valuable non−wood forest products. Wild species, a great part of which are ectomycorrhizal fungi, not only play a key role in the growth and development of forest trees, but also belong to the most used in the Polish cuisine. A new challenge is to develop a scientific basis for the production of edible ectomycorrhizal fungi. Given the fact that fructification of fungi is influenced by many environmental, ecological, orographic and anthropogenic factors, their growing is rather a tough task. So far, methods of fungi growing have been developed in case of several species and they are still to be implemented on an economic scale. Under natural conditions, both mycorrhizal and fruiting processes may be stimulated by proper silviculture treatments, which are conducive to wood and mushrooms production as well. Nowadays, the concept of ‘mycosilviculture’ is gaining more and more interest. In order to implement it, the knowledge of the biology of fungi and their host−species is needed. In this article, a rich body of studies dealing with the influence of management methods on fruitification of fungi is reviewed. The critical factor that appears is the proper regulation of tree density by appropriate severity of thinnings and regeneration cuts in order to meet the requirements of targeted fungi. The other kinds of treatments, such as removal of the herb cover, litter and upper soil level also affect fungi fructification. The effect of these treatments may vary for different species. The knowledge of wild mushroom production, forest management and climate changes still requires long−term and multidimensional research in a broad spectrum of tree stands and forest habitats.
Mushrooms are traditionally used in folk medicine in Slavic and Asian countries, especially in traditional Chinese medicine. According to the contemporary scientific research wild−growing mushrooms contain many secondary metabolites of medicinal potential. These compounds were isolated both from mushroom fruiting bodies and mycelium. Many of these bioactive substances exhibit antibacterial, anti−oxidative, and anti−inflammatory properties. They have also anti−neoplastic, anti−diabetic, and anti−atherosclerotic activity. Mushroom metabolites include polysaccharides, sesquiterpens and triterpenoids which demonstrate anti−cancer and immunostimulatory activity. Moreover, wild−growing mushrooms contain natural antibiotics and antioxidants. Mushroom species exhibit different antibacterial activity. It was found that mushroom extracts are more effective against Gram−positive than Gram−negative bacteria. Mushroom species vary significantly in their content of antioxidants. The main group of mushroom antioxidants are polyphenols, i.e. phenolic acids and flavonoids. Anti−oxidative potential of mushrooms is strongly correlated with the content of these compounds. Such species as Boletus edulis and Cantharellus cibarius demonstrate especially high antioxidant activity. Another group of antioxidants are tocopherols, carotenoids and ascorbic acid. Lectins isolated from wild−growing mushroom include polysaccharide−protein and polysaccharide−peptide complexes. They exhibit mainly antineoplastic and antiviral effect. Nowadays wild growing mushrooms are treated as a source of secondary metabolites, which can potentially be used in food, pharmacological and cosmetic industries. This paper reviews the latest scientific reports on bioactive substances identified in edible wild−growing mushrooms occurring in Poland.
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