Plant spatial compartmentalization buffers bacteriome structure and function under antibiotic stress.
Lenonyane CK, Tsholo K, Molale-Tom LG, Bezuidenhout CC, Olanrewaju OS
Soil Health
PubMedAntibiotics from livestock manure used in home and community gardens are quietly seeping into the soil your vegetables grow in, but this research shows the plants themselves may be shielding their root bacteria — and your food — better than we thought.
Scientists grew lettuce in soil spiked with common antibiotics found in farm runoff and looked at which bacteria lived in the soil, around the roots, and inside the roots. They found that where bacteria lived — in the soil, clinging to roots, or inside the plant — mattered far more than whether antibiotics were present. The bacteria inside the roots stayed stable and kept doing their helpful jobs, suggesting plants create a protected zone that resists pharmaceutical disruption.
Key Findings
Spatial location (inside vs. outside the plant) explained more bacterial community variation (R²=0.189) than antibiotic treatment (R²=0.145, non-significant), making compartment the primary driver of microbiome structure.
Bacteria inside plant roots (endosphere) showed much lower diversity than soil or root-surface communities (P=0.0001), but core plant-beneficial functions remained stable across all antibiotic treatments.
Antibiotic exposure boosted antibiotic-degrading bacteria in bulk soil (P=0.042), hinting that the microbiome can actively break down pharmaceutical residues rather than simply tolerating them.
chevron_right Technical Summary
Plants naturally protect their root-dwelling bacteria from antibiotic contamination in farm soil, keeping beneficial microbes functional even when antibiotics from manure or runoff are present. The plant itself — not the antibiotic — is the dominant force shaping which bacteria live inside and around its roots.
Abstract Preview
Agricultural antibiotic contamination poses increasing threats to crop productivity and ecosystem stability through disruption of the plant-associated microbiome. While antibiotic impacts on bulk s...
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