Exogenous abscisic acid application enhances nitrogen use efficiency and root development in rapeseed: Transcriptomic...

Area of Science:

• Plant Physiology
• Agricultural Science
• Molecular Biology

Background:

• Nitrogen is crucial for plant growth but excessive use causes environmental issues and reduces crop efficiency.
• Optimizing nitrogen use efficiency (NUE) is vital for sustainable agriculture.

Purpose of the Study:

• To investigate the effects of abscisic acid (ABA) on rapeseed (Brassica napus) root systems under varying nitrogen conditions.
• To understand ABA's role in enhancing nitrogen assimilation and mitigating low nitrogen stress.

Main Methods:

• Hydroponic cultivation of Brassica napus under high and low nitrogen conditions.
• Application of exogenous abscisic acid (ABA).
• Analysis of root morphology, nitrogen concentration, enzyme activities, phytohormone levels, and transcriptomic profiles.

Main Results:

• ABA significantly improved root growth parameters and nitrogen concentration in rapeseed.
• ABA upregulated key nitrogen assimilation and antioxidant enzyme activities, especially under low nitrogen stress.
• Transcriptomic analysis identified ABA-responsive genes related to nitrogen metabolism, stress response, and hormone signaling.

Conclusions:

• Exogenous ABA enhances nitrogen use efficiency in Brassica napus by improving root development and nitrogen assimilation.
• ABA application offers a potential molecular strategy for improving crop resilience and sustainability.
• Findings support targeted genetic approaches for enhancing NUE in crops.