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Some properties of cellulase and xylanase produced from Pleurotus ostreatus 301 and Lentinus edodes 3-1 during its growth in rice straw medium were investigated. The cellulase activities of P. ostreatus 301 and L. edodes 3-1 were increased in proportion to substrate concentration within 0.6% and 0.8%, respectively, and xylanase activities of two strains were increased within 1%. The reducing sugar production of cellulase and xyplanase in two strains were proportionaly increased until 30 min. and 60 min., respectively. The opium pH for cellulase activities of P. ostreatus 301 and L. edodes 3-1 were pH 4.0 and pH 4.5, respectively, and xylanase activities of two strains were pH 5.0. The stable pH range for cellulase activities of P. ostreatus 301 was within 4.0 to 6.0 and L. edodes 3-1 was within 3.0 to 5.0, Xylanase activities of P. ostreatus 301 was within 4.5 to 6.0 and L. edodes 3-1 was within 3.5 to 6.0. The optium temperature for cellulase activities of P. ostraeatus 301 and L. edodes 3-1 were 40℃ and 50℃, respectively, but xylanase activities of P. ostreatus 301 and L. edodes 3-1 were 50℃ and 45℃, respectively. Thermal stability of enzymes were below of optimum temperature and these were mostly inactivate at 70℃ for 10 min of the metalic ions tested, cellulase activities of L. edodes 3-1 was increased by Co^(++), Mg^(++) at the concentration of 10^(-2)M, but were greatly inhibited by Hg^(++), Cu^(++) in two strains. Xylanase activities were increased by Ca^(++), Co^(++), Mg^(++) and Cd^(++) but was greatly inhibited by Hg^(++).
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