Figure 3.
(a) qRT-PCR standard curve for cpn60-targeted SbGP detection assay. PCR efficiency (E) was determined to be >1.99 using E = 10(−1/slope) 32. Results shown are the means of duplicate determinations ± standard deviation. (b,c,d) Quantitative PCR assay (b), qRT-PCR; (c,d), ddPCR) accuracy, linearity, and detection limits determined by relating the number of copies of SbGP cpn60 UT plasmid DNA added to the reaction to the number of copies measured. ddPCR assays were performed in the absence (c); 1-plex) and presence (d); 2-plex) of DNA extracted from a healthy strawberry plant. qRT-PCR assays were performed in the presence of uninfected strawberry DNA. Results shown are the means of duplicate measurements ± standard deviation.