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- W2009355610 abstract "In this paper the validation and implementation of a Real-time PCR protocol based on ribosomal protein genes has been carried out for sensitive and specific quantification of ‘Candidatus (Ca.) Phytoplasma mali’ (apple proliferation phytoplasma, APP) in insects. The method combines the use of EvaGreen® dye as chemistry detection system and the specific primer pair rpAP15f-mod/rpAP15r3, which amplifies a fragment of 238 bp of the ribosomal protein rplV (rpl22) gene of APP. Primers specificity was demonstrated by running in the same Real-time PCR ‘Ca. Phytoplasma mali’ samples with phytoplasmas belonging to the same group (16SrX) as ‘Ca. Phytoplasma pyri’ and ‘Ca. Phytoplasma prunorum’, and also phytoplasmas from different groups, as ‘Ca. Phytoplasma phoenicium’ (16SrIX) and Flavescence dorée phytoplasma (16SrV). ‘Ca. Phytoplasma mali’ titre in insects was quantified using a specific approach, which relates the concentration of the phytoplasma to insect 18S rDNA. Absolute quantification of APP and insect 18S rDNA were calculated using standard curves prepared from serial dilutions of plasmids containing rplV-rpsC and a portion of 18S rDNA genes, respectively. APP titre in insects was expressed as genome units (GU) of phytoplasma per picogram (pg) of individual insect 18S rDNA. ‘Ca. Phytoplasma mali’ concentration in examined samples (Cacopsylla melanoneura overwintered adults) ranged from 5.94 × 102 to 2.51 × 104 GU/pg of insect 18S rDNA. Repeatability and reproducibility of the method were also evaluated by calculation of the coefficient of variation (CV%) of GU of phytoplasma and pg of 18S rDNA fragment for both assays. CV less than 14% and 9% (for reproducibility test) and less than 10 and 11% (for repeatability test) were obtained for phytoplasma and insect qPCR assays, respectively. Sensitivity of the method was also evaluated, in comparison with conventional 16S rDNA-based nested-PCR procedure. The method described has been demonstrated reliable, sensitive and specific for the quantification of ‘Ca. Phytoplasma mali’ in insects. The possibility to study the trend of phytoplasma titre in the vectors will allow a deepen investigation on the epidemiology of the disease." @default.
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- W2009355610 date "2013-06-01" @default.
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- W2009355610 title "EvaGreen Real-time PCR protocol for specific ‘Candidatus Phytoplasma mali’ detection and quantification in insects" @default.
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- W2009355610 doi "https://doi.org/10.1016/j.mcp.2013.02.001" @default.
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