Work

Pseudomonas corni sp. nov., Pseudomonas oplopanacis sp. nov., Pseudomonas salicis sp. nov., Pseudomonas rosaeacicularis sp. nov., Pseudomonas artemisiae sp. nov., Pseudomonas imperatae sp. nov. and Zestomonas ipomoeae sp. nov., isolated from rhizospheres showing plant growth promoting potential

Year: 2026

Type: article

Abstract: Several bacterial strains affiliated with the genera Pseudomonas and Zestomonas were isolated from rhizosphere samples and screened for plant growth–promoting (PGP) traits. Nine strains were analyzed polyphasically, showing ANI and dDDH values below or near species thresholds, together with phenotypic and biochemical traits supporting their differentiation. Genomic analyses revealed a repertoire of PGP-associated functions, including vitamin and cofactor biosynthesis (riboflavin, cobalamin, and thiamin), and high-affinity nutrient acquisition systems as phosphate transporters and phosphonate utilization. All strains encoded traits relevant to the rhizosphere inferred from genome annotation, including genes involved in auxin and cytokinin biosynthesis, oxidative stress tolerance, dissimilatory nitrate reduction, sulfur assimilation, and siderophore production. Metagenomic screening showed that most species are globally distributed across plant-associated, soil, freshwater, and animal-associated habitats. Based on phylogenetic, genomic, and phenotypic evidence, the strains represent seven novel species: Pseudomonas rosaeacicularis sp. nov., with AK-381 T as the type strain (= LMG 34445 T = CCM 9596 T ); Pseudomonas corni sp. nov., with AK-10 T as the type strain (= CCM 9599 T = LMG 34325 T ); Pseudomonas oplopanacis sp. nov., with AK-188 T as the type strain (= CCM 9593 T = LMG 34326 T ); Pseudomonas salicis sp. nov., with AK-309 T as the type strain (= CCM 9595 T = LMG 34328 T ); Pseudomonas artemisiae sp. nov., with DT-100 T as the type strain (= LMG 32880 T = DSM 115114 T = CCM 9281 T ); Pseudomonas imperatae sp. nov., with ST-212 T as the type strain (CCM 9594 T = LMG 34330 T ); and Zestomonas ipomoeae sp. nov., with ST-55 T as the type strain (LMG 32881 T = CCM 9283 T = DSM 115239 T ).

Source: Systematic and Applied Microbiology

DOI: 10.1016/j.syapm.2026.126719