Acta Agriculturae Zhejiangensis ›› 2021, Vol. 33 ›› Issue (9): 1676-1685.DOI: 10.3969/j.ISSN.1004-1524.2021.09.12

• Plant Protection • Previous Articles     Next Articles

Development of a fluorescent recombinase-aided amplification method for Clavibacter michiganensis subsp. nebraskensis detection

SHAN Changlin1(), ZHOU Yuan1, REN yan2, JI Wenbin1, LI Xiaojun1   

  1. 1. Comprehensive Technology Service Center of Zhoushan Customs, Zhoushan 316021, China
    2. Hangzhou Customs Technology Center, Hangzhou 310000, China
  • Received:2020-12-09 Online:2021-09-25 Published:2021-10-09

Abstract:

Clavibacter michiganensis subsp. nebraskensis(Cmn) is one of the important quarantine pathogens of imported corn. Our research objective was to develop a robust and rapid fluorescent recombinase-aided amplification (RAA) to detect Cmn. Comparative analyses of cellulase gene were performed to identify unique and conserved gene regions for primer and probe design. The unique celB sequence was determined for specific detection of Cmn. After primers screening and specificity verification, the fluorescent RAA assay with primers 2F/6R and probe P was established. Under 39 ℃, the fluorescent RAA could detect Cmn specifically with the sensitivity at 130 fg·μL-1 in 20 min. Simulated samples and actual samples were used to evaluate the reliability of fluorescent RAA, the detection result was the same as GB/T 36840—2018. Overall, the fluorescent RAA assay established in this study was high speed, specificity, and high sensitivity, which is proved to be a reliable method for Cmn detection.

Key words: Clavibacter michiganensis subsp. nebraskensis, celB, recombinase-aided amplification, fluorescent probe, rapid detection

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