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SCAR Marker and Detection Technique of Bursaphelenchus xylophilus

松材线虫SCAR标记与检测技术


将松材线虫RAPD特异片段OPM05-X2100进行分离、回收,与载体pGEM®-T Vector连接,转化大肠杆菌并培养,对目标克隆测序。根据测序结果,用Oligo5.0软件设计引物,正向引物为M05F2(5‘-CGGGT CATGG CTGGA GGTAT CGT-3‘),反向引物为M05R1(5‘-TGGCT CAATG GCAAA TCCTT CGTA-3‘),成功地将松材线虫特异片段OPM05-X2100通过引物对M05F2/R1转化为SCAR-M05-X600。运用SCAR标记引物M05F2/R对枯死松树体内分离的92份线虫样本的DNA进行标记,并对单条线虫经简易方法提取的DNA进行检测。结果表明:引物组合对所有81份松材线虫株系均扩增出一条600 bp的清晰、明亮的条带,而对8份拟松材线虫、1份霍夫曼尼伞滑刃线虫、1份大核滑刃线虫、1份长尾属线虫均无扩增产物。该对引物可以检测单条松材线虫。利用这对特异引物组合可构建松材线虫检测试剂盒,实现对松材线虫的快速检测的目标。

OPM05-M2100, the specific RAPD fragment of B. xylophilus , was collected from agarose gels and purified. Then, the purified fragment was inserted into the pGEM®-T Vector that was transformed into E. coli and cloned and sequenced. Based on the sequence of RAPD marker, the sequences characterized amplified region (SCAR) primers were designed by the aid of the software Oligo5.0. The forward primer is M05F2(5‘-CGGGT CATGG CTGGA GGTAT CGT-3‘),and the backward primer is M05R1(5‘-TGGCT CAATG GCAAA TCCTT CGTA-3‘). The specific fragment (OPM05-M2100) was successfully converted to SCAR marker (SCAR-M05-X600) by using M05F2/R1,which was the specific markers of B. xylophilus. Then, the DNA of 92 isolates of Bursaphelenchus, B. mucronatus, B. hofmanni, Aphelenchoides macronucleatus and Seinura sp. which were isolated from dead pines, were marked, and the DNA of a single nematode extracted with a simple method was detected using this set of specific primers. The results indicated that the PCR product of all 81 isolates of B. xylophilus was a clear and bright fragment about 600 bp with M05F2/R1. But eight isolates of B. mucronatus, one B. hofmanni, one A. macronucleatus and one Seinura sp. had no any fragments. Assay M05F2/R1 also successfully detected single pinewood nematode. Therefore, the specific pairwises would be used for constructing identification kits of B. xylophilus, implementing the aim of quick detection, and achieving the purpose of identify juvenile successfully.


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