Abstract
Fire blight, caused by the bacterial pathogen Erwinia amylovora, is a highly destructive disease of apple and pear. Because the apple tree gets systemically infected with E. amylovora and eventually dies, E. amylovora is a considerably important pathogen in the orchard that requires long-term management. In addition, it is crucial to prevent the spread of the pathogen by expeditious diagnosis. In this study, via comparative approaches to the genome sequences of the strains of various Erwinia spp., we designed specific primers targeting a hypothetical gene that is single copy and located in the chromosomal DNA of E. amylovora. This primer set specifically amplified the DNA of E. amylovora but no other bacteria, including E. pyrifoliae, Pectobacterium spp., Pantoea spp., and Dickeya chrysanthemi. Furthermore, the SYBR Green-based real-time PCR using the primer set allowed accurate estimation of the population of E. amylovora. Developing a rapid and accurate diagnostic method using the novel primer set enables effective defense against pathogen spread through continuous monitoring and quick response.
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