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Global diversity and potential functioning of prophages in plant pathogenic Ralstonia solanacearum bacterium

Ralstonia solanacearum is a destructive plant pathogenic bacterium which harbours a wide variety of virulence genes allowing it to infect over 200 plant species worldwide. Its virulence is also affected by the presence of integrated bacteriophages, termed prophages. While several such prophages have been identified, the global distribution and diversity of R. solanacearum prophages is unknown.
 To study this, we first identified prophages present in a diverse collection of 192 assembled R. solanacearum genomes. Prophage diversity was explored by calculating prophage genetic distances and clustering with characterised prophages in a neighbour-joining tree. Prophage clusters were further verified by assessing gene content, GC content, and prophage length. Prophage identities were determined using the NCBI Virus database, and prophage-encoded virulence genes identified by analysing pangenome content.
 343 intact prophages were identified, forming ten prophage clusters with distinct gene content, GC content, and length profiles. Five prophage clusters, containing 159 prophages, belonged to the Inoviridae, Myoviridae, and Siphoviridae phage families. The remaining 184 prophages were uncharacterised and may therefore represent novel prophages. Transcriptional regulators with potential virulence effects were identified in three prophage clusters, including one uncharacterised cluster. These prophage clusters were unequally distributed throughout the R. solanacearum population being host genotype specific.
 This research demonstrates that R. solanacearum contains a high level of uncharacterised prophage diversity and highlights novel prophages that could contribute to pathogen virulence. Given their potential host-genotype-specific virulence effects, R. solanacearumprophages could be co-evolving with their hosts, and may contribute to global variation in R. solanacearum virulence.