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A profiling approach of the natural variability of foliar N remobilization at the rosette stage gives clues to understand the limiting processes involved in the low N use efficiency of winter oilseed rape
- Source :
- Journal of Experimental Botany, Journal of Experimental Botany, 2015, 66 (9), pp.2461-2473. ⟨10.1093/jxb/erv031⟩, Journal of Experimental Botany, Oxford University Press (OUP), 2015, 66 (9), pp.2461-2473. ⟨10.1093/jxb/erv031⟩
- Publication Year :
- 2015
- Publisher :
- HAL CCSD, 2015.
-
Abstract
- International audience; Oilseed rape, a crop requiring a high level of nitogen (N) fertilizers, is characterized by low N use efficiency. To identify the limiting factors involved in the N use efficiency of winter oilseed rape, the response to low N supply was investigated at the vegetative stage in 10 genotypes by using long-term pulse-chase (15)N labelling and studying the physiological processes of leaf N remobilization. Analysis of growth and components of N use efficiency allowed four profiles to be defined. Group 1 was characterized by an efficient N remobilization under low and high N conditions but by a decrease of leaf growth under N limitation. Group 2 showed a decrease in leaf growth under low N supply that was associated with a low N remobilization efficiency under both N supplies despite a high remobilization of soluble proteins. In response to N limitation, Group 3 is characterized by an increase in N use efficiency and leaf N remobilization compared with high N that is not sufficient to sustain the leaf biomass production at a similar level to non-limited plants. Genotypes of Group 4 subjected to low nitrate were able to maintain leaf growth to the same level as under high N. The profiling approach indicated that enhancement of amino acid export and soluble protein degradation was crucial for N remobilization improvement. At the whole-plant level, N fluxes revealed that Group 4 showed a high N remobilization in source leaves combined with a better N utilization in young leaves. Consequently, an enhanced N remobilization limits N loss in fallen leaves, but this remobilized N needs to be efficiently utilized in young leaves to improve N use efficiency.
- Subjects :
- remobilisation de l'azote
nitrogen nutrition
Genotype
Physiology
Nitrogen
[SDV]Life Sciences [q-bio]
Plant Science
Biology
Protein degradation
7. Clean energy
nitrogen use efficiency
chemistry.chemical_compound
Nitrate
Gene Expression Regulation, Plant
[SDV.BV]Life Sciences [q-bio]/Vegetal Biology
Natural variability
Amino acid export
nitrogen utilization efficiency
soluble proteins
Plant Proteins
2. Zero hunger
amino acids
efficience d'utilisation de l'azote
nitrogen remobilization efficiency
genotypic variability
Brassica napus
Genetic Variation
food and beverages
protéine soluble
Limiting
azote foliaire
nutrition azotée
Plant Leaves
Agronomy
chemistry
Subjects
Details
- Language :
- English
- ISSN :
- 00220957 and 14602431
- Database :
- OpenAIRE
- Journal :
- Journal of Experimental Botany, Journal of Experimental Botany, 2015, 66 (9), pp.2461-2473. ⟨10.1093/jxb/erv031⟩, Journal of Experimental Botany, Oxford University Press (OUP), 2015, 66 (9), pp.2461-2473. ⟨10.1093/jxb/erv031⟩
- Accession number :
- edsair.doi.dedup.....c8578296acfba53b00678767bb557719