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New bacteriophages that infect the phytopathogen Ralstonia solanacearum

Department of Molecular Biotechnology, Graduate School of Advanced Sciences of Matter, Hiroshima University, Higashi-Hiroshima 739-8530, Japan

Correspondence
Takashi Yamada
tayamad{at}hiroshima-u.ac.jp

Four kinds of bacteriophage (RSL, RSA, RSM and RSS) were isolated from Ralstonia solanacearum, a soil-borne Gram-negative bacterium that is the causative agent of bacterial wilt in many important crops. The Myovirus-type phages RSL1 and RSA1 contained dsDNA genomes of 240 kbp and 39 kbp, respectively. These phages have relatively wide host ranges and gave large clear plaques with various host strains; especially RSA1 was able to infect all 15 R. solanacearum strains of different races or different biovars tested in this study. Three host strains contained RSA1-related sequences in their genomic DNAs, suggesting a lysogenic cycle of RSA1. Two phages, RSM1 and RSS1, were characterized as Ff-type phages (Inovirus) based on their particle morphology, genomic ssDNA and infection cycle. However, despite their similar fibrous morphology, their genome size (9.0 kb for RSM1 and 6.6 kb for RSS1) and genome sequence were different. Strains of R. solanacearum that were sensitive to RSM1 were resistant to RSS1 and vice versa. Several R. solanacearum strains contained RSM1-related sequences and at least one strain produced RSM1 particles, indicating the lysogenic state of this phage. These phages may be useful as a tool not only for molecular biological studies of R. solanacearum pathogenicity but also for specific and efficient detection (RSM1 and RSS1) and control of harmful pathogens (RSL and RSA) in cropping ecosystems as well as growing crops.

This article has been cited by other articles:

				A. Fujiwara, T. Kawasaki, S. Usami, M. Fujie, and T. Yamada Genomic Characterization of Ralstonia solanacearum Phage {phi}RSA1 and Its Related Prophage ({phi}RSX) in Strain GMI1000 J. Bacteriol., January 1, 2008; 190(1): 143 - 156. [Abstract] [Full Text] [PDF]