Abstract
Carbon sources of Piricularia oryzae were studied, using synthetic culture solutions containing biotin and vitamin B1 that have been. recently shown to be indispensable for Piricularia oryzae. Carbon sources studied are the following-sugars: viz., glucose, fructose, galactose, sucrose, lactose, maltose; polysaccharides: viz., soluble starch, inulin; higher alcohols: viz., glycerine, mannit; and organic acids: viz., formic acid, acetic acid, oxalic acid, succinic acid, lactic acid, citric acid.
According to the here-described experiments, sucrose and maltose are the most excellent carbon sources for the present fungus. Glucose, inulin and mannit follow them in succesion in relation to the carbon nutrition. Carbonic acids are generally improper as carbon source of the present fungus, but pretty good mycelial development is observed in solutions containing succinic acid and citric acid, which are included in Krebs' T.C.A. cycle. This fact suggests the connection of Piricularia oryzae's metabolism with the T.C.A. cycle.
Carbon sources, on which mycelial development is clearly observed, are enumerated in the order of their nutritiousness as follows: 1. maltose, 2. sucrose, 3. glucose, 4. inulin, 5. mannit, 6. succinic acid, 7. fructose, 8. soluble starch, 9. lactose, 10. citric acid, and 11. galactose.
