By UV inducing the protoplasm, a high ASTA producing mutant was obtatined, compared with the initinal strain, the yield of ASTA was increased 86.5%.

• 确定了原生质体UV 照射的致死率情况；并在70%25-85%25的致死率下筛选到一株高产诱变菌株；虾青素产量较出发菌株提高85.；6%25。