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Plant Promoter Analysis: Identification and Characterization of Root Nodule Specific Promoter in the Common Bean

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Genetic Control of Root Morphology in Rapeseed Recombinant Inbred Lines Grown Under Contrasting Nitrogen Levels.

Loïc Haelterman¹, Anne Laperche², Sébastien Faure³

¹Crop Production and Biostimulation Laboratory, Brussels Bioengineering School, Université libre de Bruxelles (ULB), Brussels, Belgium.

Physiologia Plantarum

|August 6, 2025

Summary

Optimizing rapeseed root traits through genetic analysis under varying nitrogen levels can enhance nitrogen uptake. This study identified key genetic regions and candidate genes for improving root morphology in Brassica napus L. crops.

Keywords:

linkage analysis nitrogen quantitative trait locus rapeseed root morphology

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Area of Science:

Plant Genetics
Agricultural Science
Crop Physiology

Background:

Nitrogen fertilization is crucial for oleaginous rapeseed (Brassica napus L.) growth.
Optimizing root morphology for nitrogen uptake can enhance agricultural sustainability and reduce fertilizer costs.

Purpose of the Study:

Investigate the genetic basis of root traits in rapeseed under different nitrate conditions.
Identify quantitative trait loci (QTLs) associated with root morphology and nitrogen response.

Main Methods:

Utilized two connected recombinant inbred line populations of Brassica napus L.
Grew plants hydroponically with low (0.2 mM) and high (5 mM) nitrate levels.
Performed QTL mapping using population-specific and multi-parental models under each nitrate level and for nitrate response.

Main Results:

Low nitrate levels increased root-to-shoot biomass ratio and primary root growth.
Significant genotype × nitrate interactions influenced phenotypic variance.
Identified 36 QTLs, with five shared regions between populations and one stable region across nitrate levels and strategies.
Candidate genes including CYTOKININ RESPONSE FACTOR 2, NIN LIKE PROTEIN 7, and LOB DOMAIN-CONTAINING PROTEIN 3 were located in stable regions.

Conclusions:

Genetic factors significantly control root morphology in rapeseed under varying nitrogen availability.
Stable QTLs and candidate genes provide targets for marker-assisted selection to improve nitrogen use efficiency in Brassica napus L.