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Torchetti, Enza Maria; Navarro, Beatriz; Di Serio, Francesco
Journal of virological methods, 12/2012, Letnik: 186, Številka: 1-2Journal Article
► A polyprobe detecting at least eight pospiviroid species was developed. ► The polyprobe sensitivity was similar to that of single probes. ► Validation was based on dot–blot assays of 68 samples from different host species. ► The polyprobe will be useful for quarantine, certification and survey programs. The spread of viroids belonging to the genus Pospiviroid (family Pospiviroidae), recorded recently in ornamentals and vegetables in several European countries, calls for fast, efficient and sensitive detection methods. Based on bioinformatics analyses of sequence identity among all pospiviroids, a digoxigenin-labeled polyprobe (POSPIprobe) was developed that, when tested by dot–blot and Northern-blot hybridization, detected Potato spindle tuber viroid, Citrus exocortis viroid, Columnea latent viroid, Mexican papita viroid, Tomato planta macho viroid, Tomato apical stunt viroid, Pepper chat fruit viroid and Chrysanthemum stunt viroid. The end-point detection limits of the POSPIprobe ranged from 5−2 to 5−4, and from 5−1 to 5−3 for nucleic acid preparations obtained by phenol extraction and silica-capture, respectively, similar to those of single probes. Based on sequence identity, the POSPIprobe is expected to detect also the two pospiviroid species not tested in this study (Tomato chlorotic dwarf viroid and Iresine viroid-1). Dot–blot assays with the POSPIprobe were validated by testing 68 samples from tomato, chrysanthemum and argyranthemum infected by different pospiviroids as revealed by RT-PCR, thus confirming the potential of this polyprobe for quarantine, certification and survey programs.
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in: SICRIS
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