Summary
This paper reports the characterisation of Sphingomonas sediminicola, a non-rhizobial bacterium naturally enriched in pea crop rotation systems, which establishes a genuine symbiotic association with pea and promotes plant biomass production. Genomic analysis and microscopic studies revealed the presence of nodulation and nitrogen fixation genes and documented the progression from bacterial colonisation through infection thread formation to bacteroid differentiation within root nodules. The findings suggest S. sediminicola could offer an alternative bio-input strategy for sustainable pea production under reduced nitrogen fertilisation.
Regional applicability
The study was conducted in France and examined pea in rotation within European ploughed soil systems, making the findings potentially transferable to United Kingdom arable farming contexts, particularly for organic and low-input systems seeking alternatives to mineral nitrogen fertilisers. The applicability would depend on whether S. sediminicola occurs naturally in UK soil or can establish effectively under UK soil and climatic conditions.
Key measures
Plant biomass production; presence of root nodules; genome sequences encoding secretion systems, Nod factor synthesis, and nitrogenase genes; light and electron microscopy observations of infection threads and bacteroid development
Outcomes reported
The study demonstrated that S. sediminicola colonises pea plants and establishes a symbiotic association promoting biomass production, with genomic sequencing revealing genes for secretion systems, Nod factor synthesis, and nitrogenase activity. Microscopic observations characterised the infection process including infection thread formation, bacterial entry into root cells, and bacteroid development in root nodules.
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