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Brassinosteroid seed priming with nitrogen supplementation improves salt tolerance in soybean
Mona Soliman1,2, Amr Elkelish3, Trabelsi Souad1
11Biology Department, Faculty of Science, Taibah University, Yanbu, Saudi Arabia.
Summary
Brassinosteroid (24-epibrassinolide, EBL) seed priming and nitrogen (N) supply enhance soybean salt tolerance. Combined EBL and N treatments significantly improved growth, biomass, and osmolyte accumulation under salt stress.
Area of Science:
- Plant Physiology
- Agricultural Science
- Biochemistry
Background:
- Salt stress negatively impacts soybean growth and biomass by inducing oxidative and osmotic damage.
- Brassinosteroids and nitrogen are crucial for plant development and stress response.
Purpose of the Study:
- To investigate the combined effects of brassinosteroid (24-epibrassinolide, EBL) seed priming and optimal nitrogen (N) supply on soybean salt tolerance.
- To understand the physiological mechanisms underlying improved salt tolerance.
Main Methods:
- Soybean plants were subjected to optimal and salt stress conditions with varying treatments: control, EBL priming only, N supply only, and combined EBL priming and N supply.
- Evaluated growth, biomass accumulation, tissue water content, osmolyte accumulation (proline, glycine betaine, sugars), and antioxidant activity.
Main Results:
- Salt stress significantly reduced soybean growth and biomass.
- Both EBL seed priming and N supply improved soybean performance under stress.
- Combined EBL and N treatments were most effective, significantly increasing osmolyte accumulation and antioxidant activity.
- These improvements were linked to better photo-protection and maintenance of tissue water content.
Conclusions:
- Salt stress impairs soybean growth via oxidative and osmotic stress.
- EBL seed priming enhances soybean salt tolerance.
- Nitrogen supplementation further boosts the efficacy of EBL in improving soybean salt tolerance, offering a promising strategy for sustainable agriculture.
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