井岗霉素对水稻纹枯病有着显著的防治效果,药效达90％以上,为目前水稻上推广应用、安全有效的一个理想农药。我国的井岗霉素产量约占农用抗生素产量的90％以上,但发酵效价较高的菌株并不多见,一般在2万单位/毫升左右。为了进一步提高井岗霉素产量,选育高产菌株是提高发酵单位效价、缩短发酵周期最为经济有效的途径。因此,我们采用目前生产厂家所用的井岗霉素产生菌25,通过亚硝酸诱变处理,筛选出了 Jinggangmycin on rice sheath blight has a significant control effect, the effect of more than 90%, for the promotion of rice on the application of a safe and effective pesticide. Jinggangmycin production in China accounts for about 90% of agricultural antibiotic production, but strains with higher fermentation titer are rare, usually about 20,000 units / ml. In order to further improve the production of Jinggangmycin, breeding high-yielding strains is the most cost-effective way to improve the potency of fermentation units and shorten the fermentation period. Therefore, we use the current manufacturer of Jinggangmycin producing bacteria 25, by nitrous acid mutagenic treatment, screened out