Abstract: Effect of nutritive quality of 201 and Shanyou 63 rice straw on mycelium growth of Lentinula edodes was studied,blocking effect of biogenic silicate against the biodegradation of N and C in rice straw was discussed as well. The growth rate of mycelium on medium of 201 rice straw was similar with that on wheat brain (CK) as 0.39 cm·d^-1 and 0.42 cm·d^-1 respectively,but significantly high than that on media of Shanyou 63 rice straw (0.31 cm·d^-1 ), 201 rice head (0.31 cm·d^-1 ) and 201 rice blade (0.23 cm·d^-1 ). Biogenic silicate in rice straw showed a blocking effect on biodegradation of protein and fibrous nutrients in straw cell wall of Lentinula edodes mycelium.Two Lentinula edodes spp were selected from several species for their relatively wide adaptability.

Key words: Lentinula edodes, Mycelium growth, Rice straw nutrition