Abstract: The antagonistic effects, the growth speed of hypha and mycelial biomass as well as polysaccharide content of three different Pleutotus nerbrodensis strains were tested in this study. The results showed that the genetic diversity exists in three strains. The hypha growth speed of strain pL03-7 is the fastest, 7.35 mm per day. And strain pL03-7 has the highest mycelial biomass, 1.0612 g/150 ml. The polysaccharide contents of strains pL03-7, PN-1 and PN-9 are 63.80, 73.93 and 72.29μg/mg respectively.

Key words: Pleurotus nerbrodensis, growth speed of hypha, mycelial biomass, polysaccharide content, antagonistic effect