Synergistic Consortia with Bacillus megaterium A14 Enhance Cadmium Immobilization in the Arachis hypogaea Rhizosphere.
Yang X, Huang B, Ren J, Fang L, He W
Soil Health
Peanuts grown in cadmium-contaminated soil quietly accumulate that metal into the nuts you eat, and this research shows that the right mix of soil bacteria can cut that contamination in half without chemicals.
Scientists added a helpful bacterium to peanut plant soil and discovered it 'recruited' two other naturally occurring soil bacteria to form a team. Together, the three bacteria worked as a group to trap cadmium — a toxic metal that can sneak into food crops from polluted soils — keeping it locked in the dirt rather than absorbed into the plant. This natural soil bacteria team reduced the amount of cadmium reaching the peanut stems and roots by up to 51%, offering a biological approach to making crops safer to eat.
Key Findings
A three-strain bacterial consortium (Bacillus megaterium A14, Microbacterium S3, and Paenibacillus S22) reduced cadmium content in peanut stems by 51.34% and roots by 29.14% in pot experiments.
The consortium shifted cadmium in rhizosphere soil from a mobile, plant-available form (exchangeable fraction dropped from 41% to 23%) to a stable, locked-in form (residual fraction rose from 10% to 30%).
Bacillus megaterium A14 attracted the two cooperative strains through metabolic secretions and together they formed biofilms, immobilizing cadmium through both intracellular uptake and extracellular adsorption.
chevron_right Technical Summary
Researchers found that adding a specific soil bacterium to peanut fields recruited two native soil microbes to form a three-way team that locked cadmium — a toxic heavy metal — in the soil, preventing it from entering the peanut plant and cutting cadmium levels in stems and roots by roughly half.
Abstract Preview
The microbial immobilization of cadmium bioavailability in peanut-growing soils is crucial for food safety. This study investigated the effects of exogenously applied Bacillus megaterium A14 on the...
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