Complete Genome of an Alkali-Resistant Rhizobium anhuiense Symbiont of Pea Reveals Species-Specific Plasmid Fusion and Genomic Plasticity.
Miao J, Zhang C, Jiang Q, Yao Z, Cao K
Soil Health
Growing peas in your garden could one day mean skipping the fertilizer bag entirely — bacteria like this one already live in the soil and can supply nitrogen directly to plant roots, and understanding their genetics brings us closer to harnessing that for home and farm alike.
Researchers mapped the complete DNA blueprint of a naturally occurring soil bacterium found inside pea root nodules — the tiny bumps on pea roots where nitrogen gets converted into plant food. This particular bacterium is unusually good at working in alkaline (high-pH) soils and produces a plant hormone that stimulates growth. In greenhouse tests, peas grown with it had more chlorophyll and absorbed significantly more nitrogen than peas grown without it, all with no added fertilizer.
Key Findings
The bacterium produced ~184 mg/L of IAA (a key plant growth hormone), and peas inoculated with it showed increased chlorophyll content and nitrogen uptake under nitrogen-deficient conditions.
The genome spans 7.36 Mb with 6,899 protein-coding genes spread across one chromosome and five plasmids, including a lineage-specific megaplasmid formed by an unusual plasmid fusion event.
The strain grows optimally at alkaline pH 8.0–10.0 and tolerates mild salinity, making it a candidate biofertilizer for challenging soil conditions where conventional fertilizers are less effective.
chevron_right Technical Summary
Scientists fully sequenced the genome of a soil bacterium that naturally fertilizes pea plants by fixing nitrogen from the air, and found it thrives in alkaline soils while significantly boosting plant growth without synthetic fertilizer.
Abstract Preview
The rhizosphere microbiome is crucial for plant growth and stress resilience in sustainable horticulture. Here, we report the complete genome assembly and functional characterisation of Rhizobium a...
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Pea is a pulse or fodder crop, but the word often refers to the seed or sometimes the pod of this flowering plant species. Peas are eaten as a vegetable.