Govania unica gen. nov., sp. nov., a rare biosphere bacterium that represents a novel family in the class Alphaproteobacteria

The isolation of as-yet-uncultivated micro-organisms is one of today’s major challenges in microbiology.Table 1.

While the debate on whether high or low proportions of bacteria are cultivable across major biomes is ongoing and to some extent also a semantic exercise, it is clear that numerous environmental microorganisms, and especially members of the so-called rare biosphere (Lynch and Neufeld, 2015), remain as yet uncultivated (Steen et al., 2019, Hug et al., 2016, Martiny, 2020, Martiny, 2019). While recent cultivation studies have focused on the development of sophisticated methods that mimic natural conditions or facilitate in situ incubation (Stewart, 2012); high-throughput cultivation efforts convincingly demonstrated that standard plating techniques have not yet been fully deployed for the cultivation of the so-called ‘uncultivated majority’ (Lewis et al., 2021, Browne et al., 2016). In the present study we report on the isolation of strain LMG 31809T in the frame of a long-term culturomic study of a temperate, mixed deciduous forest soil sample. To the best of our knowledge this soil isolate represents the first cultivated strain of a novel family in the class Alphaproteobacteria.

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