By sequence comparison of intergenic transcribed spacer(ITS) region of 16S-23S rDNA, it was revealed that RSD pathogen was highly conversat. Lxx guangdong isolate shares almost 100% nucleotide identity with Brazil,Australia and USA isolates.

• 同时对PCR扩增的目的片段核苷酸序列进行测定与分析。 结果表明广东湛江蔗区RSD病菌16S-23SrDNA基因间隔区核苷酸序列与巴西、澳大利亚及美国路易斯安娜州RSD株系基因组相应区段核苷酸同一率接近100%25,病菌高度的同源。