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Functional Annotation of Altered Root Metabolites and Metabolic Pathways in Spring Wheat Cultivars Under Varying
Ekemini Edet Obok1,2,3, Anthony Egrinya Eneji2, Haruyuki Fujimaki3
1Crop Improvement Unit, Department of Crop Science, University of Calabar, Calabar, Nigeria.
Physiologia Plantarum
|August 14, 2026
Summary
Extended light exposure improves salt tolerance in wheat roots by altering metabolic pathways. This finding offers new strategies for breeding crops resilient to salinity and ensuring food security.
Area of Science:
- Plant Science
- Environmental Stress Physiology
- Metabolomics
Background:
- Salinity significantly reduces crop yields, threatening global food security.
- Root-level salt tolerance mechanisms, especially under varying photoperiods, are underexplored.
- Photoperiod manipulation is a potential strategy for enhancing crop stress resilience.
Purpose of the Study:
- To investigate the combined effects of salinity and photoperiod on root metabolism in spring wheat.
- To identify metabolic adaptations in salt-sensitive and salt-tolerant wheat cultivars under different light conditions.
- To explore the role of photoperiod in modulating plant responses to salt stress.
Main Methods:
- Spring wheat cultivars (2 salt-tolerant, 2 salt-sensitive) were subjected to salinity (80 mM NaCl) under normal (12L:12D) and extended (22L:2D) photoperiods.
- Root fresh and dry weights were measured.
- Metabolomic profiling was performed using liquid chromatography-mass spectrometry (LC-MS) to identify root metabolites and affected pathways.
Main Results:
- Salt-sensitive cultivars, particularly GS-6058, showed improved root growth under extended photoperiods, indicating enhanced physiological adaptation.
- Metabolomic analysis identified 83 root metabolites, with 20 pathways significantly impacted by salinity and photoperiod.
- Salt-sensitive GS-6058 exhibited substantial metabolic perturbations under extended photoperiods, while salt-tolerant cultivars maintained stable profiles. Alanine, aspartate, and glutamate metabolism were notably altered.
Conclusions:
- Photoperiod significantly modulates plant responses to salt stress, influencing root growth and metabolic profiles.
- Metabolic pathway biomarkers can be targeted for breeding wheat cultivars with enhanced salinity resilience.
- Integrating metabolomics with gene expression analysis is crucial for understanding adaptive regulatory networks.
Related Concept Videos
02:02Responses to Salt Stress
Salt stress—which can be triggered by high salt concentrations in a plant’s environment—can significantly affect plant growth and crop production by influencing photosynthesis and the absorption of water and nutrients.
01:57Adaptations that Reduce Water Loss
Though evaporation from plant leaves drives transpiration, it also results in loss of water. Because water is critical for photosynthetic reactions and other cellular processes, evolutionary pressures on plants in different environments have driven the acquisition of adaptations that reduce water loss.
01:40Overview of Metabolism
Living cells constantly carry out various chemical reactions which are necessary for their proper functioning. These reactions are interlinked to one another via multiple pathways. The collection of these chemical reactions is known as metabolism.
Plant Metabolism
Sunlight, the primary source of energy in plants, is first absorbed by the chlorophyll pigments present in their leaves. Plants then use this energy to carry out photosynthesis, where water is oxidized into oxygen and carbon dioxide...
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