根据对转座子Ｔｎ５ｇｕｓＡ５诱变甘蓝黑腐病菌所获得３９株胞外多糖突变体的３种胞外酶活性和在含２％葡萄糖的ＮＹＧＡ培养基上的菌落形态的检测结果，将突变株分成５种类型。Ｓｏｕｔｈｅｒｎ杂交结果表明它们的突变位于基因组中的８个不同的位置，其中１个位于已鉴定的ｒｐｆ调控基因簇 According to the results of three extracellular enzyme activities of 39 extracellular polysaccharide mutants obtained from the transposon Tn5gusA5 mutagenesis and the colony morphology on NYGA medium containing 2% glucose, the mutant strains were divided into 5 types. Southern hybridization results show that their mutations are located in eight different positions in the genome, one of which is located in the identified cluster of rpf regulatory genes