Abstract
Ralstonia solanacearum species complex is deleterious plant pathogenic bacteria causing bacterial wilt in the members of solanaceous crops and the bacterial wilt is difficult to control. Bacteriophages-based biocontrol is an environmentally friendly and promising strategy to control bacterial plant diseases. In this study, we isolated 72 phages from the various crop cultivated soils in Korea using five different strains of R. solanacearum. Among 72 phages, phage RpY1 was selected for further study based on the specificity of the targeted host. This phage was identified as a member of Podoviridae with a head measuring 60-70nm in length and short tail according to the morphology of transmission electron microscopy images. The genome size of phage RpY1 is 43,284bp with G + C content of 61.4% and 53 open reading frames (ORFs), including 18 annotated ORFs and 35 hypothetical proteins. This phage genome showed no homology to the genome of known phages except for the DU_RP_II phage infecting R. solanacearum; however, the host range of phage RpY1 is much narrower than that of DU_RP_II.
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