The bacterial strain SECRCQ15T was isolated from seeds of Chenopodium quinoa in Spain. Phylogenetic, chemotaxonomic, and phenotypic analyses, as well as genome similarity indices, support the classification of the strain into a novel species of the genus Ferdinandcohnia, for which we propose the name Ferdinandcohnia quinoae sp. nov. To dig deep into the speciation features of the strain SECRCQ15T, we performed a comparative genomic analysis of the genome of this strain and those of the type strains of species from the genus Ferdinandcohnia. We found several genes related with plant growth-promoting mechanisms within the SECRCQ15T genome. We also found that singletons of F. quinoae SECRCQ15T are mainly related to the use of carbohydrates, which is a common trait of plant-associated bacteria. To further reveal speciation events in this strain, we revealed genes undergoing diversifying selection (e.g., genes encoding ribosomal proteins) and functions likely lost due to pseudogenization. Also, we found that this novel species contains 138 plant-associated gene-cluster functions that are unique within the genus Ferdinandcohnia. These features may explain both the ecological and taxonomical differentiation of this new taxon.

Departamento de Microbiología y Genética Universidad de Salamanca Salamanca Spain

Institute of Microbiology of the Czech Academy of Sciences Vídeňská Prague Czech Republic

Instituto de Investigación en Agrobiotecnología Universidad de Salamanca Salamanca Spain

Instituto de Recursos Naturales y Agrobiología IRNASA CSIC Salamanca Spain

Unidad Asociada Grupo de Interacción Planta Microorganismo Universidad de Salamanca IRNASA CSIC Salamanca Spain

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