Journal Article

Nitrogen uptake, assimilation and remobilization in plants: challenges for sustainable and productive agriculture

Céline Masclaux-Daubresse, Françoise Daniel-Vedele, Julie Dechorgnat, Fabien Chardon, Laure Gaufichon and Akira Suzuki

in Annals of Botany

Published on behalf of The Annals of Botany Company

Volume 105, issue 7, pages 1141-1157
Published in print June 2010 | ISSN: 0305-7364
Published online March 2010 | e-ISSN: 1095-8290 | DOI: http://dx.doi.org/10.1093/aob/mcq028
Nitrogen uptake, assimilation and remobilization in plants: challenges for sustainable and productive agriculture

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  • Ecology and Conservation
  • Evolutionary Biology
  • Plant Sciences and Forestry

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Background

Productive agriculture needs a large amount of expensive nitrogenous fertilizers. Improving nitrogen use efficiency (NUE) of crop plants is thus of key importance. NUE definitions differ depending on whether plants are cultivated to produce biomass or grain yields. However, for most plant species, NUE mainly depends on how plants extract inorganic nitrogen from the soil, assimilate nitrate and ammonium, and recycle organic nitrogen. Efforts have been made to study the genetic basis as well as the biochemical and enzymatic mechanisms involved in nitrogen uptake, assimilation, and remobilization in crops and model plants. The detection of the limiting factors that could be manipulated to increase NUE is the major goal of such research.

Scope

An overall examination of the physiological, metabolic, and genetic aspects of nitrogen uptake, assimilation and remobilization is presented in this review. The enzymes and regulatory processes manipulated to improve NUE components are presented. Results obtained from natural variation and quantitative trait loci studies are also discussed.

Conclusions

This review presents the complexity of NUE and supports the idea that the integration of the numerous data coming from transcriptome studies, functional genomics, quantitative genetics, ecophysiology and soil science into explanatory models of whole-plant behaviour will be promising.

Keywords: Nitrogen use efficiency; remobilization; quantitative trait loci; natural variation; nitrate transporter; ammonium assimilation; glutamine synthetase; leaf senescence; nutrient recycling

Journal Article.  13103 words.  Illustrated.

Subjects: Ecology and Conservation ; Evolutionary Biology ; Plant Sciences and Forestry

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