A L-tryptophan-highly productive strain TQ2223 was derived from Corynebacterium glutamicum Tx5-32 by stepwise mutagenic treatments with DES.

• 以谷氨酸棒杆菌Tx5 - 32 (Phe- +Tyr- )为出发菌株 ,经硫酸二乙酯 (DES)多次诱变处理 ,定向选育出一株L -色氨酸产生菌TQ2 2 2 3(Phe- +Tyr- +5 -MTr+5 -FTr+SGr+CINr)。