article · Phytopathology
The cosmopolitan bacterium <i>Pantoea agglomerans</i> is renowned for its dual nature, with some strains promoting plant growth and aiding in the suppression of pests and phytopathogens, while others have been linked to plant disease and opportunistic human infections. This duality hampers the biotechnological application of this bacterium and underpins the necessity for taxonomic refinement. The genomes of 295 <i>P. agglomerans</i> strains were subjected to phylogenomic analyses (core genome phylogeny, ANI and dDDH), with strains consistently resolving as two coherent clades supported by proteome content analysis. Average interclade dDDH values (79.1%) fall near the proposed subspecies threshold. Comparative genomic analysis identified clade-specific orthologues and phenotypic assays demonstrate that citrate utilisation distinguishes the two clades. Based on these genotypic and phenotypic markers, we propose delineation of two subspecies of <i>P. agglomerans</i>, subspecies <i>agglomerans</i> (which includes the <i>P. agglomerans</i> type strain) and subsp. <i>jekyllhydei</i>, to reflect the dual nature of this versatile bacterial species.
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DOI: 10.1094/phyto-01-26-0021-sa
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