Salt tolerant mutant and salt dependent mutants were screened on selective medium by using solid NTG to mutagenize B5. Some characteristics of these mutants have been studied.
用固体亚硝基胍诱变该菌株，在选择培养基上筛选到盐敏感突变株和盐依赖突变株。 并初步研究了这些突变菌株的生长特性。
The latter reflects the selective constraints on the probabilities of fixation of a mutant allele in genome type.
后者反映了选择约束对密码子分布的影响。
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