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Exploiting Genetic Variability of Root Morphology as a Lever to Improve Nitrogen Use Efficiency in Oilseed Rape

  • Julien Louvieaux
  • Hugues De Gernier
  • Christian Hermans
Chapter

Abstract

Nitrogen (N) is the quantitatively most important nutrient in cropping systems. The use of nitrate as a mineral fertilizer is highly energy-intensive and causes greenhouse gas emission and groundwater pollution. Therefore, the need to reduce N-fertilizer input is pressing. In order to compensate that reduction, new crop genotypes must be sought with improved nitrogen use efficiency (NUE). While research has been mainly conducted on N assimilation and remobilization processes in aerial organs, breeders often consider the root organ as a black box. This chapter envisages an era of modern root biology discoveries to improve NUE. Yet, optimizing the degree of root branching for exploring a large soil volume may contribute to higher N uptake. Our focus is on winter oilseed rape, a crop that releases an important N balance surplus after harvest. We provide an example of high-throughput hydroponic screen of root morphology with a diversity set grown at two contrasting N supplies. Key observations are the considerable degree of variability in the root morphological traits among genotypes and the absence of trade-off between profuse root branching and shoot biomass production. Furthermore, root morphological traits observed at a young developmental stage in laboratory setups positively correlate with seed N and protein concentrations measured in the field.

Keywords

Arabidopsis Field trial Hydroponics Natural variation Nitrogen Mineral nutrition Oilseed rape Root morphology 

Notes

Acknowledgements

We thank László Kupcsik for setting up the pouch-and-wick system with Julien.Louvieaux

Sources of funding

This work is supported by an incentive research grant from the Fonds de la Recherche Scientifique (F.R.S.-FNRS) and by Wiener Anspach Fondation at ULB. Christian.Hermans. is an F.R.S.-FNRS Research Associate

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© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  • Julien Louvieaux
    • 1
    • 2
  • Hugues De Gernier
    • 1
    • 3
  • Christian Hermans
    • 1
  1. 1.Laboratory of Plant Physiology and Molecular Genetics, Interfacultary School of BioengineersUniversité libre de BruxellesBrusselsBelgium
  2. 2.Laboratory of Applied Plant EcophysiologyHaute Ecole Provinciale de Hainaut Condorcet, Centre pour l’Agronomie et l’Agro-industrie de la Province de HainautAthBelgium
  3. 3.Center for Plant Systems BiologyVIB-UGentGhentBelgium

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