These ancient microbes thrive in your garden soil and even inside your own gut
In short: Long dismissed as extreme-environment specialists, Methanobacteriati are actually everywhere. From the salt-crusted edges of the ocean to the roots of your garden plants, these diverse archaea are far more adaptable than scientists once believed. They are rewriting the rules of microbial life, proving that extreme survival is just one trick.
Methanobacteriati, formerly known as Euryarchaeota, represent a diverse kingdom of archaea defined by unique DNA polymerase and specific rRNA sequences. While they include methanogens—microbes that produce methane and frequently inhabit animal intestines—the group also encompasses halobacteria capable of surviving intense salinity, alongside various thermophilic organisms that flourish in temperatures ranging from 41 to 122 °C. Their physical forms are equally varied, appearing as rods or cocci, and their cell walls may or may not contain pseudomurein.
The traditional view that these organisms are restricted to harsh, extreme environments was challenged by a 2019 study by Korzhenkov et al. This research revealed that Methanobacteriati are present in moderate habitats, including acidic, low-temperature environments, marshlands, and water springs. Crucially, they are also found in soil and rhizospheres. In these garden-adjacent environments, their presence is often tied to mycorrhizal fungi; higher fungal populations correlate with greater frequency and diversity of these archaea, suggesting a symbiotic or dependent relationship.
Taxonomic classification of this group has been volatile. Under the International Code of Nomenclature of Prokaryotes, the name Methanobacteriati was only validly published in 2024, following an amendment that allowed for kingdom and domain levels. Before this, the group lacked a valid name under the Code. The NCBI taxonomy browser updated its listings in October 2024 to reflect this shift, moving away from the older phylum-level classification. Meanwhile, other databases like the Genome Taxonomy Database do not recognize the kingdom level at all, and debates persist regarding whether groups like Nanobdellati should be integrated into the Methanobacteriati kingdom.
Despite these naming complexities, the biological reality remains that these microbes are highly adaptable. Some, such as the order Halobacteriales, typically inhabit sulfur-rich, hyper-saline conditions but can successfully grow in salt concentrations as low as 2.5%, matching the salinity of seawater. This flexibility, combined with their presence in diverse moderate ecosystems, marks them as a far more versatile group than their reputation as mere extremophiles suggests.
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- Summary by Intellect · source: Methanobacteriati
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