Development and comparative validation of genomic-driven PCR-based assays to detect Xanthomonas citri pv. citri in citru
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METHODOLOGY ARTICLE
Open Access
Development and comparative validation of genomic-driven PCR-based assays to detect Xanthomonas citri pv. citri in citrus plants Isabelle Robène1* , Véronique Maillot-Lebon1, Aude Chabirand2, Aurélie Moreau2, Nathalie Becker3, Amal Moumène4, Adrien Rieux1, Paola Campos1,3, Lionel Gagnevin5, Myriam Gaudeul6, Claudia Baider7, Fréderic Chiroleu1 and Olivier Pruvost1
Abstract Background: Asiatic Citrus Canker, caused by Xanthomonas citri pv. citri, severely impacts citrus production worldwide and hampers international trade. Considerable regulatory procedures have been implemented to prevent the introduction and establishment of X. citri pv. citri into areas where it is not present. The effectiveness of this surveillance largely relies on the availability of specific and sensitive detection protocols. Although several PCRor real-time PCR-based methods are available, most of them showed analytical specificity issues. Therefore, we developed new conventional and real-time quantitative PCR assays, which target a region identified by comparative genomic analyses, and compared them to existing protocols. Results: Our assays target the X. citri pv. citri XAC1051 gene that encodes for a putative transmembrane protein. The real-time PCR assay includes an internal plant control (5.8S rDNA) for validating the assay in the absence of target amplification. A receiver-operating characteristic approach was used in order to determine a reliable cycle cut-off for providing accurate qualitative results. Repeatability, reproducibility and transferability between real-time devices were demonstrated for this duplex qPCR assay (XAC1051-2qPCR). When challenged with an extensive collection of target and non-target strains, both assays displayed a high analytical sensitivity and specificity performance: LOD95% = 754 CFU ml− 1 (15 cells per reaction), 100% inclusivity, 97.2% exclusivity for XAC1051-2qPCR; LOD95% = 5234 CFU ml− 1 (105 cells per reaction), 100% exclusivity and inclusivity for the conventional PCR. Both assays can detect the target from naturally infected citrus fruit. Interestingly, XAC1051-2qPCR detected X. citri pv. citri from herbarium citrus samples. The new PCR-based assays displayed enhanced analytical sensitivity and specificity when compared with previously published PCR and real-time qPCR assays. (Continued on next page)
* Correspondence: [email protected] 1 CIRAD, UMR PVBMT, Saint-Pierre, Reunion Island, France Full list of author information is available at the end of the article
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