Nutritional Requirement for the Vegetative Growth of Agrocybe cylindracea (Yanagimatsutake Mushroom)

Studies on the Use for Food of the Vegetative Mycelia of Basidiomycotina Part II

Abstract

The nutritional requirement for the vegetative growth of Agrocybe cylindracea (Fr.) Maire (yanagimatsutake mushroom) was investigated by synthetic liquid medium. (1) A wide range of carbohydrates was utilized as carbon sources in the medium which supported growth of Agrocybe cylindracea. Glucose, xylose, mannose, fructose, lactose, maltose, dextrin, glycogen, pectin and soluble starch were especially good carbon source for mycelial growth. However, rhamnose, sorbose, sucrose, erythritol, arabitol, xylitol, mannitol, galactitol, inositol and adonitol were not effective as carbon source. (2) Yeast extract, soyton, peptone, meat extract, Casamino acid and the amino acids mixture of the basal medium were acceptable nitrogen sources for the growth. On the other hand, ammonium and nitrate salt were poor as nitrogen source for vegetative growth. (3) The vegetative mycelium did not grow in the absence of KH₂PO₄ and MgSO₄. The vegetative mycelium yield was severely decreased by the omission of ZnSO₄. The other mineral salts [CaCl₂, FeSO₄, CuSO₄, MnSO₄, (NH4)₆ Mo₇O₂₄] did not show any special effect for the vegetative growth. (4) The vegetative mycelium required thiamine for the growth. Each of the other vitamins (nicotinamide, riboflavin, pantothenic acid, pyridoxine, folic acid, cyanocobalamin, biotin, inositol) was effective for the vegetative growth. (5) Nucleic acid bases (adenine, guanine, cytosine, thymine, uracil, orotic acid) was effective for the vegetative growth.