In total 14 strains of gram-negative, rod-shaped bacteria were isolated from Sophora longicarinata and Sophora microphylla root nodules and authenticated as rhizobia on these hosts. Based on the 16S rRNA gene phylogeny, they were shown to belong to the genus Mesorhizobium, and the S. longicarinata strains were most closely related to Mesorhizobium amorphae ACCC 19665T (99.8 - 99.9%), Mesorhizobium huakuii IAM 14158T (99.8 - 99.9%), Mesorhizobium loti USDA 3471T (99.5 - 99.9%) and Mesorhizobium septentrionale SDW 014T (99.6 - 99.8%), whilst the S. microphylla strains were most closely related to Mesorhizobium ciceri UPM-Ca7T (99.8 - 99.9%), Mesorhizobium qingshengii CCBAU 33460T (99.7%) and Mesorhizobium shangrilense CCBAU 65327T (99.6%). Additionally, these strains formed two distinct groups in phylogenetic trees of the housekeeping genes glnII, recA and rpoB. Chemotaxonomic data, including fatty acid profiles supported the assignment of our strains to the genus Mesorhizobium and allowed differentiation from the closest neighbours. Results of DNA-DNA hybridisations, MALDI-TOF MS analysis, ERIC-PCR, physiological and biochemical tests allowed genotypic and phenotypic differentiation of our strains from their nearest neighbouring species. Therefore, the S. longicarinata and S. microphylla strains represent two novel species for which the names Mesorhizobium waimense sp. nov. (ICMP 19557T = LMG 28228T = HAMBI 3608T) and Mesorhizobium cantuariense sp. nov. (ICMP 19515T = LMG 28225T = HAMBI 3604T), are proposed respectively.
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