STUDIES ON THE MYCELIAL BIOMASS AND STARCH DEGRADATION OF FOUR DIFFERENT MORCHELLA SPECIES IN SOLID FERMENTATION
HAN Jian rong (Department of Life Science, Shanxi University, Taiyuan 030006)
In same solid fermentation medium, corn meal or potato meal medium, the mycelial biomass of four different Morchella species, M.esculenta, M.conica, M.angusticeps and M.crassipes , have no significant deciations, while the amylase activities and degradation rate of starch show significant differcnce. The M.conica is the strongest of four different Morchella species in degradation to starch. By supplement of Ca 2+ and nitrogen source, such as soybean meal, KNO 3, NH 4NO 3 and (NH 4) 2SO 4, and prolongation of fermentation time from 15 d to 25 d, the mycelial biomass and amylase activity and degradation rate of starch can be raised siginificantly.After M.conica 25 d fermentation at 25℃ in both the corn meal medium and the potato meal medium that is supplemented with 10% soybean meal and 0.1% Ca(Cl) 2, the degradation rates of corn starch and potato starch reach respectively 74.2% and 79.8%.