Investigation on Growth Characteristics of Dendrobium 's Mycorrhizal Fungi in Liquid-culture

The investigation shows that the fungus No.F9903 is much better than others. It grew faster, 1.222 cm per day under the most suitable temperature,30 ℃.Although it could be cultivated in the liquid within pH3 8,it grew bigger in the pH 7,the total weight of the mycelium up to 1.45 mg·mL-1,increase 131.8 times during cultivated period.Among 8 kinds of N sources (ammonium sulfate,ammonium nitrate,calcium nitrate,kalium nitrate,organic urea,ammonium tartrate,glycin,and glutamic acid),ammonium tartrate is the best in absorbing and assimilating this fungus,the total weight is up to 1.684 mg·mL-1,153 times of the originality.Next is the glutamic acid.Giving 8 kinds of C (glucose,fructose,sugar,maltose,ethanol,mannaol,dextrin,dissoluble starch)every one could be used,especially the fructose,the total weight of the mycelium up to 1.501 mg·mL-1 increase by 136 times.Among the sources of phosphor,kalium phosphate with two hydrogen atom (1 mg·mL-1)is the best,the total weight of the mycelium up to 1.256 mg·mL-1,increase by 114.2 times.