Low biological efficiency is a defect in straw mushroom production. Mycelia of the straw mushroom were exposed to
UV radiation to induce mutagenesis and improve the strains of straw mushroom for a high yield. A UV exposure time that
yielded a survival rate of about 25% was applied for mutation induction. After UV treatment, 65 putative mutant strains were
obtained and seven fast-growing strains were selected for further analysis. Mushroom cultivation experiments revealed that the
biological efficiency of four of the new strains was approximately 30% higher than the parental strain. The radial mycelial colony
growth rate was assessed on different media and under various temperature and pH conditions for physical characterization. The
results indicated that the overall growth rates of the mutant strains were higher than the parental strain. Genetic character