Summary
This study characterises the highly conserved bacterial microbiota inhabiting maize stem xylem sap across diverse soil types, climatic zones and maize genotypes, revealing selective recruitment of Gammaproteobacteria with elevated nitrogen-fixation capacity. Synthetic communities comprising core diazotrophs and helper bacteria were shown to actively fix nitrogen in planta, contributing approximately 12% of the total nitrogen accumulated in maize stems. The findings suggest that endophytic nitrogen-fixing communities represent an underexploited biological resource for improving crop productivity and nitrogen nutrition.
UK applicability
The study's findings on endophytic nitrogen fixation in maize are potentially relevant to UK cereal production, though regional adaptation would be required given the original research was conducted in China. The principle of harnessing plant-associated diazotrophs could support nitrogen-use efficiency improvements in UK arable systems, but field validation under UK temperate conditions and soil types would be necessary before practical application.
Key measures
Bacterial community composition (16S rRNA sequencing), nitrogenase gene (nifH) abundance, nitrogen fixation contribution via 15N isotopic dilution method, GFP-tagged strain tracking
Outcomes reported
The study identified 25 core bacterial taxa in maize stem xylem sap, enriched in nitrogen-fixing Gammaproteobacteria. Synthetic communities (SynComs) of selected diazotrophs and helper strains contributed 11.8% of total nitrogen accumulated in maize stems through biological nitrogen fixation.
Topic tags
Dig deeper with Pulse AI.
Pulse AI has read the whole catalogue. Ask about this record, its theme, or how the findings apply to UK farming and policy — every answer cites the underlying studies.