Twelve Rhodobacter sphaeroides mutants disturbed in ammonia assimilation ( Asm-) were independently isolated by employing transposon Tn5-generated mutation.

• 利用转座子Tn5随机插入诱变筛选得到12株浑球红细菌(Rhodobacter sphaeroides)氨同化缺陷突变株(Asm~-)。