The common symbiosis pathway controls plant root microbiomes in a host-specific manner
Martyn, A.; Thorsgaard Jensen, I.; Lind Salomonsen, C.; Blahovska, Z.; Tao, K.; Dings, H.; Nott Bjoergvinsdottir, T.; Tolstrup Christensen, B.; Oldroyd, G.; Waagepetersen, R.; Glasius, M.; Radutoiu, S.
Soil Health
The bacteria clinging to barley and clover roots right now are being choreographed by the same ancient genes that let plants first colonize land—and cracking how those genes tune root chemistry could let farmers grow more food with less fertilizer.
Plants host enormous communities of helpful bacteria on their roots, and scientists have long wondered whether all plants use the same rulebook to build those communities. This study found that yes, there is a shared genetic switch that controls root bacteria in both a flowering legume and a cereal grain—but flipping that switch produces completely different bacterial communities in each plant. The key is that each plant produces its own unique blend of chemical signals in the soil, so even though the genetic instruction is the same, the result looks different depending on who is doing the talking.
Key Findings
Mutations in the same conserved symbiosis genes reshaped root bacterial communities in both Lotus (a legume) and barley, confirming the pathway has broad microbiome control beyond just mycorrhizal fungi and nitrogen-fixing bacteria.
The taxonomic outcomes were host-specific: in Lotus, disrupting the pathway reduced rhizobial colonization and allowed other commensal bacteria to fill the niche, while in barley the same mutations broadly reshuffled bacterial lineages without resembling the Lotus response.
Root chemical profiles—particularly compounds in the flavonoid, coumarin, and gibberellin families—differed between the two hosts in a pathway-dependent way, linking the genetic switch to distinct soil chemistry that drives divergent bacterial community outcomes.
chevron_right Technical Summary
Plants use an ancient genetic pathway to shape the communities of beneficial bacteria living on their roots, but the specific bacteria recruited differ dramatically between plant species—even when the same genes are disrupted. This means that while the 'instructions' are conserved, each plant species executes them through its own unique soil chemistry.
Abstract Preview
Crop nutrition depends on plant-microbe interactions, yet it remains unclear whether conserved genetic pathways impose universal rules on root microbiome assembly across plant hosts. Here, we show ...
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