Journal
FRONTIERS IN PLANT SCIENCE
Volume 11, Issue -, Pages -Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/fpls.2020.602548
Keywords
source-sink relationships; senescence; amino acid; catabolism; assimilation; transport; nitrogen use efficiency (NUE); crop plant
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Funding
- FLUCOLSA project - Young Researcher grant from the Institut National pour la Recherche, l'agronomie et l'environnement (INRAE)
- RAPSODYN project - program Investments for the Future [ANR-11-BTBR-0004]
- Agence Nationale de la Recherche (ANR) [ANR-11-BTBR-0004] Funding Source: Agence Nationale de la Recherche (ANR)
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In a context of a growing worldwide food demand coupled to the need to develop a sustainable agriculture, it is crucial to improve crop nitrogen use efficiency (NUE) while reducing field N inputs. Classical genetic approaches based on natural allelic variations existing within crops have led to the discovery of quantitative trait loci controlling NUE under low nitrogen conditions; however, the identification of candidate genes from mapping studies is still challenging. Amino acid metabolism is the cornerstone of plant N management, which involves N uptake, assimilation, and remobilization efficiencies, and it is finely regulated during acclimation to low N conditions and other abiotic stresses. Over the last two decades, biotechnological engineering of amino acid metabolism has led to promising results for the improvement of crop NUE, and more recently under low N conditions. This review summarizes current work carried out in crops and provides perspectives on the identification of new candidate genes and future strategies for crop improvement.
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