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Transcriptomic Signatures of Nitrate Response in Rapeseed Genotypes With Distinct Root System Sizes
Loïc Haelterman1, Run Qi1, Pramod Sargar1
1Crop Production and Biostimulation Laboratory, Brussels Bioengineering School, Université libre de Bruxelles, Brussels, Belgium.
Physiologia Plantarum
|May 5, 2026
Summary
Improving rapeseed (Brassica napus L.) nitrogen use efficiency is key for sustainable agriculture. This study reveals genetic variations in root traits and identifies key genes for enhancing nutrient uptake through root system optimization.
Area of Science:
- Plant Biology
- Agricultural Science
- Genetics
Background:
- Excessive nitrogen fertilization degrades the environment.
- Rapeseed (Brassica napus L.) exhibits poor nitrogen uptake efficiency.
- Optimizing root traits is crucial for enhancing nutrient acquisition in rapeseed.
Purpose of the Study:
- Investigate root transcriptomic responses to nitrate availability in rapeseed.
- Identify genetic variations in root morphology and their control.
- Discover candidate genes and regulatory networks for breeding improved rapeseed varieties.
Main Methods:
- Screened 40 rapeseed lines for root morphology on agar plates.
- Conducted transcriptomic profiling (RNA sequencing) on root tissues under varying nitrate levels.
- Performed differential gene expression and co-expression network analyses.
Main Results:
- Identified significant variation in root morphology with strong heritability.
- Discovered over 1000 nitrate-responsive genes, with limited overlap across genotypes.
- Uncovered regulatory modules linking nitrate transporters, auxin signaling, and energy metabolism.
Conclusions:
- Root system size is associated with distinct molecular signatures.
- Glucosinolate biosynthesis and aquaporin activity are implicated in nitrate response.
- Identified promising gene targets for developing rapeseed with enhanced root traits for sustainable agriculture.
