The Plant Pathology Journal

The Korean Society of Plant Pathology (한국식물병리학회)
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A Field Deployable Real-Time Loop-Mediated Isothermal Amplification Targeting Five Copy nrdB Gene for the Detection of 'Candidatus Liberibacter asiaticus' in Citrus

  • Tirumalareddy Danda (Texas A&M University-Kingsville Citrus Center) ;
  • Jong-Won Park (Texas A&M University-Kingsville Citrus Center) ;
  • Kimberly L. Timmons (Texas A&M University-Kingsville Citrus Center) ;
  • Mamoudou Setamou (Texas A&M University-Kingsville Citrus Center) ;
  • Eliezer S. Louzada (Texas A&M University-Kingsville Citrus Center) ;
  • Madhurababu Kunta (Texas A&M University-Kingsville Citrus Center)
  • Received : 2023.02.14
  • Accepted : 2023.06.09
  • Published : 2023.08.01
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Abstract

Huanglongbing (HLB) is one of the most destructive diseases in citrus, which imperils the sustainability of citriculture worldwide. The presumed causal agent of HLB, 'Candidatus Liberibacter asiaticus' (CLas) is a non-culturable phloem-limited α-proteobacterium transmitted by Asian citrus psyllids (ACP, Diaphorina citri Kuwayama). A widely adopted method for HLB diagnosis is based on quantitative real-time polymerase chain reaction (qPCR). Although HLB diagnostic qPCR provides high sensitivity and good reproducibility, it is limited by time-consuming DNA preparation from plant tissue or ACP and the requirement of proper lab instruments including a thermal cycler to conduct qPCR. In an attempt to develop a quick assay that can be deployed in the field for CLas detection, we developed a real-time loop-mediated isothermal amplification (rt-LAMP) assay by targeting the CLas five copy nrdB gene. The rt-LAMP assay using various plant sample types and psyllids successfully detected the nrdB target as low as ~2.6 Log10 copies. Although the rt-LAMP assay was less sensitive than laboratory-based qPCR (detection limit ~10 copies), the data obtained with citrus leaf and bark and ACP showed that the rt-LAMP assay has >96% CLas detection rate, compared to that of laboratory-based qPCR. However, the CLas detection rate in fibrous roots was significantly decreased compared to qPCR due to low CLas titer in some root DNA sample. We also demonstrated that the rt-LAMP assay can be used with a crude leaf DNA extract which is fully deployable in the field for quick and reliable HLB screening.

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References

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