Summary
This narrative review synthesises current understanding of the nitrogen journey in plants, from soil uptake through transporter-mediated absorption and metabolic incorporation into amino acids. The authors examine how plants fine-tune nitrogen metabolism via enzyme isoforms in response to environmental cues, and discuss emerging evidence that nitric oxide mediates plant survival under drought and salt stress. The review concludes by proposing that genomic approaches to enhance nitrogen fixation through diazotrophic associations could reduce reliance on synthetic fertilisers whilst maintaining plant productivity.
Regional applicability
The physiological mechanisms described are broadly applicable to crop systems globally, including the United Kingdom. However, the review does not discuss region-specific agronomic conditions, soil types, or climate factors relevant to UK farming practice; transferability of microbiota-based nitrogen fixation strategies would require validation under UK environmental and soil conditions.
Key measures
Transporter structure and specificity; glutamine synthetase and glutamate synthase isoforms; nitric oxide signalling under drought and salinity stress; nitrogen fixation capacity via diazotrophic microbiota
Outcomes reported
The study characterises nitrogen uptake mechanisms in plants through transporter structure and function, and examines nitrogen metabolism pathways and their regulation under environmental stress. It also explores the role of nitric oxide in stress responses and considers alternative strategies such as diazotrophic microbiota for reducing synthetic nitrogen fertiliser dependence.
Topic tags
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