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A novel  Pseudomonas , designated strain BBB001 T , an aerobic, rod-shaped bacterium, was isolated from the rhizosphere of  Nicotiana glauca  in Las Palmas Gran Canaria, Spain. Genomic analysis revealed that it could not be assigned to any known species of  Pseudomonas , so the name  Pseudomonas palmensis  sp. nov. was proposed. A 16S rRNA gene phylogenetic analysis suggested affiliation to the  Pseudomonas brassicae  group, being  P. brassicae  MAFF212427  T  the closest related type strain. Upon genomic comparisons of both strains, all values were below thresholds established for differentiation: average nucleotide identity (ANI, 88.29%), average amino acid identity (AAI, 84.53%), digital DNA-DNA hybridization (dDDH, 35.4%), and TETRA values (0.98). When comparing complete genomes, a total of 96 genes present exclusively in BBB001 T  were identified, 80 of which appear associated with specific subsystems. Phenotypic analysis has shown its ability to assimilate glucose, potassium gluconate, capric acid malate, trisodium citrate, and phenylacetic acid; it was oxidase positive. It is able to produce auxins and siderophores  in vitro ; its metabolic profile based on BIOLOG Eco has shown a high catabolic capacity. The major fatty acids accounting for 81.17% of the total fatty acids were as follows: C 16:0  (33.29%), summed feature 3 (22.80%) comprising C 16:1  ω7 c  and C 16:1  ω6 c , summed feature 8 (13.66%) comprising C 18:1  ω7 c , and C 18:1 ω6 c  and C 17:0  cyclo (11.42%). The ability of this strain to improve plant fitness was tested on tomato and olive trees, demonstrating a great potential for agriculture as it is able to trigger herbaceous and woody species. First, it was able to improve iron nutrition and growth on iron-starved tomatoes, demonstrating its nutrient mobilization capacity; this effect is related to its unique genes related to iron metabolism. Second, it increased olive and oil yield up to 30% on intensive olive orchards under water-limiting conditions, demonstrating its capacity to improve adaptation to adverse conditions. Results from genomic analysis together with differences in phenotypic features and chemotaxonomic analysis support the proposal of strain BBB001 T  (=LMG 31775 T  = NCTC 14418 T ) as the type strain of a novel species for which the name  P. palmensis  sp. nov is proposed.

frontiers in microbiology

Pseudomonas palmensis sp. nov., a Novel Bacterium Isolated From Nicotiana glauca Microbiome: Draft Genome Analysis and Biological Potential for Agriculture