The mutant 3-30 was obtained by streptomycin-resistance screening,its aerial hyphal and spores output were more abundant than the parent strain,and the potency was increased by 11.9%.

• 首轮采用链霉素抗性筛选；得到突变株3-30；斜面外观丰满程度明显好于原对照株；发酵效价提高11.；9%25;