Draft genome sequences for three unisolated -infective Sp+ strains, AgTrS, AiOr and AvVan, the first sequenced strains able to sporulate .

Actinobacteria from genus are able to form symbiotic associations with actinorhizal plants including alders. Among them, Sp+ strains are characterized by their ability to differentiate numerous sporangia inside host plant cells (unlike "Sp-" strains unable of sporulation). Here, we report the first genome sequences of three unisolated Sp+ strains: AgTrS, AiOr and AvVan obtained from , and (previously known as ), respectively (with genome completeness estimated at more than 98%). They represent new species based on Average Nucleotide Identity (ANI) calculations, and the smallest -infective genomes so far sequenced (~5 Mbp), with 5,178, 6,192 and 5,751 candidate protein-encoding genes for AgTrS, AiOr and AvVan, respectively.