Genome Resource Announcement of 48 Whole Genomes of Pseudomonas amygdali pv. morsprunorum , a Causal Agent of Canker Disease in Prunus Species

Pseudomonas amygdali pv. morsprunorum (Pam) is a member of a P. syringae species complex responsible for bacterial canker disease on stone fruit ( Prunus spp.), such as cherry and plum trees. Prior characterization of Pam isolates from the United Kingdom indicated distinct virulence among Prunus spp.; however, the genomic analysis of this clade is limited to a few whole genomes available. To investigate the emergence and evolution of Pam, a larger collection of genomes and virulence phenotypes on Prunus spp. is needed. In this work, we have assembled whole genomes and assessed virulence on Prunus spp. for 30 novel and 18 historic Pam isolates. Mapping the phylogeny of these isolates to our virulence assay results revealed clear host specificities. Our data also show that within the known clade of Pam that are pathogenic on cherry, a low virulent branch is present. This genome announcement provides 48 whole genomes with corresponding host ranges on Prunus spp. that will be utilized for future investigation into the drivers of pathogen emergence and evolution of Pam on Prunus. [Formula: see text] Copyright © 2026 The Author(s). This is an open access article distributed under the CC BY-NC-ND 4.0 International license .