MozartV1, PascalFrancis, Corpus, bibRecord, 000042

Allocation and remobilisation of nitrogen in spring oilseed rape (Brassica napus L. cv. Mozart) as affected by N supply and elevated CO2

Identifieur interne : 000042 ( PascalFrancis/Corpus ); précédent : 000041; suivant : 000043

Allocation and remobilisation of nitrogen in spring oilseed rape (Brassica napus L. cv. Mozart) as affected by N supply and elevated CO2

Auteurs : J. Franzaring ; G. Gensheimer ; S. Weller ; I. Schmid ; A. Fangmeier

Source :

Environmental and experimental botany [ 0098-8472 ] ; 2012.

RBID : Pascal:12-0275151

Descripteurs français

Pascal (Inist)
- Facteur influence, Approvisionnement, Augmentation, Marquage isotopique, Rapport carbone azote, Efficacité nutriment, Relation source puits, Botanique, Brassica napus var. oleifera, Dioxyde de carbone, Remobilisation, Azote 15, Ecologie végétale.

English descriptors

KwdEn :
- Botany, Brassica napus var. oleifera, Carbon dioxide, Carbon nitrogen ratio, Increase, Influence factor, Isotope labelling, Nitrogen-15, Nutrient recovery, Plant ecology, Remobilization, Source sink relationship, Supply.

Abstract

CO₂ enrichment interacts with the resource economy of plants, but time-integrated studies on N partitioning between different plant parts, C:N ratios and N remobilisation are mostly lacking. The present study addressed the nitrogen use efficiency (NUE) in spring oilseed rape (OSR) grown at three N fertilisation levels and two CO₂ concentrations (380 vs. 550 μmol mol^-1). N was supplied in three equal gifts at sowing, stem elongation and flowering. One of these gifts was labelled with ¹⁵NH₄¹⁵NO₃ respectively. Six intermediate harvests and a final harvest were performed to determine dry mass, N concentrations. C:N, N recovery and δ¹⁵N signatures in the plant fractions root, main stem, branches, green and senescent leaves, pod walls and seeds. While N concentrations were lower and C:N higher in green leaves under CO₂ enrichment, more N remained in the root until the final harvest. Under ambient CO₂ concentrations the harvestable product (seeds) contained 50.7%. 44.5% and 41 % of the total N supplied in the treatments that received 75, 150 and 225 kg ha^-1 N, respectively. Under elevated CO₂ these values decreased to 47.4%, 34.5% and 15% reducing the NUE of the seeds by 2%, 33% and 65%, respectively. In CO₂ exposed amply fertilised plants much of the N remained in the side stems due to strongoutbranching and reduced seed set. However, N remobilisation was more affected by the different N supply than by the CO₂ enrichment. The boosted growth of OSR under high availability of disrupted the source :sink relationships so that benefits from the CO₂ enrichment on stem and root growth could not be realised by yield formation.

Notice en format standard (ISO 2709)

Pour connaître la documentation sur le format Inist Standard.

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A11	`04`	`1`		`@1 SCHMID (I.)`
A11	`05`	`1`		`@1 FANGMEIER (A.)`
A14	`01`			`@1 Universität Hohenheim, Institut für Landschafts- und Pflanzenökologie (320), FG. Pflanzenökologie und Ökotoxikologie, Ökologiezentrum 2, August-von-Hartmann-Str. 3 @2 70599 Stuttgart @3 DEU @Z 1 aut. @Z 2 aut. @Z 3 aut. @Z 4 aut. @Z 5 aut.`
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C01	`01`		`ENG`	@0 CO₂ enrichment interacts with the resource economy of plants, but time-integrated studies on N partitioning between different plant parts, C:N ratios and N remobilisation are mostly lacking. The present study addressed the nitrogen use efficiency (NUE) in spring oilseed rape (OSR) grown at three N fertilisation levels and two CO₂ concentrations (380 vs. 550 μmol mol^-1). N was supplied in three equal gifts at sowing, stem elongation and flowering. One of these gifts was labelled with ¹⁵NH₄¹⁵NO₃ respectively. Six intermediate harvests and a final harvest were performed to determine dry mass, N concentrations. C:N, N recovery and δ¹⁵N signatures in the plant fractions root, main stem, branches, green and senescent leaves, pod walls and seeds. While N concentrations were lower and C:N higher in green leaves under CO₂ enrichment, more N remained in the root until the final harvest. Under ambient CO₂ concentrations the harvestable product (seeds) contained 50.7%. 44.5% and 41 % of the total N supplied in the treatments that received 75, 150 and 225 kg ha^-1 N, respectively. Under elevated CO₂ these values decreased to 47.4%, 34.5% and 15% reducing the NUE of the seeds by 2%, 33% and 65%, respectively. In CO₂ exposed amply fertilised plants much of the N remained in the side stems due to strongoutbranching and reduced seed set. However, N remobilisation was more affected by the different N supply than by the CO₂ enrichment. The boosted growth of OSR under high availability of disrupted the source :sink relationships so that benefits from the CO₂ enrichment on stem and root growth could not be realised by yield formation.
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C03	`06`	`X`	`FRE`	`@0 Efficacité nutriment @5 06`
C03	`06`	`X`	`ENG`	`@0 Nutrient recovery @5 06`
C03	`06`	`X`	`SPA`	`@0 Eficacia nutrimento @5 06`
C03	`07`	`X`	`FRE`	`@0 Relation source puits @5 07`
C03	`07`	`X`	`ENG`	`@0 Source sink relationship @5 07`
C03	`07`	`X`	`SPA`	`@0 Relación fuente sumidero @5 07`
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C03	`13`	`X`	`FRE`	`@0 Ecologie végétale @4 CD @5 98`
C03	`13`	`X`	`ENG`	`@0 Plant ecology @4 CD @5 98`
C03	`13`	`X`	`SPA`	`@0 Ecología vegetal @4 CD @5 98`
C07	`01`	`X`	`FRE`	`@0 Cruciferae @2 NS`
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C07	`02`	`X`	`FRE`	`@0 Dicotyledones @2 NS`
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C07	`03`	`X`	`FRE`	`@0 Angiospermae @2 NS`
C07	`03`	`X`	`ENG`	`@0 Angiospermae @2 NS`
C07	`03`	`X`	`SPA`	`@0 Angiospermae @2 NS`
C07	`04`	`X`	`FRE`	`@0 Spermatophyta @2 NS`
C07	`04`	`X`	`ENG`	`@0 Spermatophyta @2 NS`
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N21				`@1 205`
N44	`01`			`@1 OTO`
N82				`@1 OTO`

Format Inist (serveur)

NO :	PASCAL 12-0275151 INIST
ET :	Allocation and remobilisation of nitrogen in spring oilseed rape (Brassica napus L. cv. Mozart) as affected by N supply and elevated CO₂
AU :	FRANZARING (J.); GENSHEIMER (G.); WELLER (S.); SCHMID (I.); FANGMEIER (A.)
AF :	Universität Hohenheim, Institut für Landschafts- und Pflanzenökologie (320), FG. Pflanzenökologie und Ökotoxikologie, Ökologiezentrum 2, August-von-Hartmann-Str. 3/70599 Stuttgart/Allemagne (1 aut., 2 aut., 3 aut., 4 aut., 5 aut.)
DT :	Publication en série; Niveau analytique
SO :	Environmental and experimental botany; ISSN 0098-8472; Coden EEBODM; Pays-Bas; Da. 2012; Vol. 83; Pp. 12-22; Bibl. 3/4 p.
LA :	Anglais
EA :	CO₂ enrichment interacts with the resource economy of plants, but time-integrated studies on N partitioning between different plant parts, C:N ratios and N remobilisation are mostly lacking. The present study addressed the nitrogen use efficiency (NUE) in spring oilseed rape (OSR) grown at three N fertilisation levels and two CO₂ concentrations (380 vs. 550 μmol mol^-1). N was supplied in three equal gifts at sowing, stem elongation and flowering. One of these gifts was labelled with ¹⁵NH₄¹⁵NO₃ respectively. Six intermediate harvests and a final harvest were performed to determine dry mass, N concentrations. C:N, N recovery and δ¹⁵N signatures in the plant fractions root, main stem, branches, green and senescent leaves, pod walls and seeds. While N concentrations were lower and C:N higher in green leaves under CO₂ enrichment, more N remained in the root until the final harvest. Under ambient CO₂ concentrations the harvestable product (seeds) contained 50.7%. 44.5% and 41 % of the total N supplied in the treatments that received 75, 150 and 225 kg ha^-1 N, respectively. Under elevated CO₂ these values decreased to 47.4%, 34.5% and 15% reducing the NUE of the seeds by 2%, 33% and 65%, respectively. In CO₂ exposed amply fertilised plants much of the N remained in the side stems due to strongoutbranching and reduced seed set. However, N remobilisation was more affected by the different N supply than by the CO₂ enrichment. The boosted growth of OSR under high availability of disrupted the source :sink relationships so that benefits from the CO₂ enrichment on stem and root growth could not be realised by yield formation.
CC :	002A
FD :	Facteur influence; Approvisionnement; Augmentation; Marquage isotopique; Rapport carbone azote; Efficacité nutriment; Relation source puits; Botanique; Brassica napus var. oleifera; Dioxyde de carbone; Remobilisation; Azote 15; Ecologie végétale
FG :	Cruciferae; Dicotyledones; Angiospermae; Spermatophyta; Plante oléagineuse
ED :	Influence factor; Supply; Increase; Isotope labelling; Carbon nitrogen ratio; Nutrient recovery; Source sink relationship; Botany; Brassica napus var. oleifera; Carbon dioxide; Remobilization; Nitrogen-15; Plant ecology
EG :	Cruciferae; Dicotyledones; Angiospermae; Spermatophyta; Oil plant (vegetal)
SD :	Factor influencia; Aprovisionamiento; Aumentación; Marcación isotópica; Relación carbono nitrógeno; Eficacia nutrimento; Relación fuente sumidero; Botánica; Brassica napus var. oleifera; Carbono dióxido; Remobilización; Nitrógeno-15; Ecología vegetal
LO :	INIST-9462.354000507981080020
ID :	12-0275151

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Pascal:12-0275151

Le document en format XML

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<front><div type="abstract" xml:lang="en">CO<sub>2</sub>
 enrichment interacts with the resource economy of plants, but time-integrated studies on N partitioning between different plant parts, C:N ratios and N remobilisation are mostly lacking. The present study addressed the nitrogen use efficiency (NUE) in spring oilseed rape (OSR) grown at three N fertilisation levels and two CO<sub>2</sub>
 concentrations (380 vs. 550 μmol mol<sup>-1</sup>
). N was supplied in three equal gifts at sowing, stem elongation and flowering. One of these gifts was labelled with <sup>15</sup>
NH<sub>4</sub>
<sup>15</sup>
NO<sub>3</sub>
 respectively. Six intermediate harvests and a final harvest were performed to determine dry mass, N concentrations. C:N, N recovery and δ<sup>15</sup>
N signatures in the plant fractions root, main stem, branches, green and senescent leaves, pod walls and seeds. While N concentrations were lower and C:N higher in green leaves under CO<sub>2</sub>
 enrichment, more N remained in the root until the final harvest. Under ambient CO<sub>2</sub>
 concentrations the harvestable product (seeds) contained 50.7%. 44.5% and 41 % of the total N supplied in the treatments that received 75, 150 and 225 kg ha<sup>-1</sup>
 N, respectively. Under elevated CO<sub>2</sub>
 these values decreased to 47.4%, 34.5% and 15% reducing the NUE of the seeds by 2%, 33% and 65%, respectively. In CO<sub>2</sub>
 exposed amply fertilised plants much of the N remained in the side stems due to strongoutbranching and reduced seed set. However, N remobilisation was more affected by the different N supply than by the CO<sub>2</sub>
 enrichment. The boosted growth of OSR under high availability of disrupted the source :sink relationships so that benefits from the CO<sub>2</sub>
 enrichment on stem and root growth could not be realised by yield formation.</div>
</front>
</TEI>
<inist><standard h6="B"><pA><fA01 i1="01" i2="1"><s0>0098-8472</s0>
</fA01>
<fA02 i1="01"><s0>EEBODM</s0>
</fA02>
<fA03 i2="1"><s0>Environ. exp. bot.</s0>
</fA03>
<fA05><s2>83</s2>
</fA05>
<fA08 i1="01" i2="1" l="ENG"><s1>Allocation and remobilisation of nitrogen in spring oilseed rape (Brassica napus L. cv. Mozart) as affected by N supply and elevated CO<sub>2</sub>
</s1>
</fA08>
<fA11 i1="01" i2="1"><s1>FRANZARING (J.)</s1>
</fA11>
<fA11 i1="02" i2="1"><s1>GENSHEIMER (G.)</s1>
</fA11>
<fA11 i1="03" i2="1"><s1>WELLER (S.)</s1>
</fA11>
<fA11 i1="04" i2="1"><s1>SCHMID (I.)</s1>
</fA11>
<fA11 i1="05" i2="1"><s1>FANGMEIER (A.)</s1>
</fA11>
<fA14 i1="01"><s1>Universität Hohenheim, Institut für Landschafts- und Pflanzenökologie (320), FG. Pflanzenökologie und Ökotoxikologie, Ökologiezentrum 2, August-von-Hartmann-Str. 3</s1>
<s2>70599 Stuttgart</s2>
<s3>DEU</s3>
<sZ>1 aut.</sZ>
<sZ>2 aut.</sZ>
<sZ>3 aut.</sZ>
<sZ>4 aut.</sZ>
<sZ>5 aut.</sZ>
</fA14>
<fA20><s1>12-22</s1>
</fA20>
<fA21><s1>2012</s1>
</fA21>
<fA23 i1="01"><s0>ENG</s0>
</fA23>
<fA43 i1="01"><s1>INIST</s1>
<s2>9462</s2>
<s5>354000507981080020</s5>
</fA43>
<fA44><s0>0000</s0>
<s1>© 2012 INIST-CNRS. All rights reserved.</s1>
</fA44>
<fA45><s0>3/4 p.</s0>
</fA45>
<fA47 i1="01" i2="1"><s0>12-0275151</s0>
</fA47>
<fA60><s1>P</s1>
</fA60>
<fA61><s0>A</s0>
</fA61>
<fA64 i1="01" i2="1"><s0>Environmental and experimental botany</s0>
</fA64>
<fA66 i1="01"><s0>NLD</s0>
</fA66>
<fC01 i1="01" l="ENG"><s0>CO<sub>2</sub>
 enrichment interacts with the resource economy of plants, but time-integrated studies on N partitioning between different plant parts, C:N ratios and N remobilisation are mostly lacking. The present study addressed the nitrogen use efficiency (NUE) in spring oilseed rape (OSR) grown at three N fertilisation levels and two CO<sub>2</sub>
 concentrations (380 vs. 550 μmol mol<sup>-1</sup>
). N was supplied in three equal gifts at sowing, stem elongation and flowering. One of these gifts was labelled with <sup>15</sup>
NH<sub>4</sub>
<sup>15</sup>
NO<sub>3</sub>
 respectively. Six intermediate harvests and a final harvest were performed to determine dry mass, N concentrations. C:N, N recovery and δ<sup>15</sup>
N signatures in the plant fractions root, main stem, branches, green and senescent leaves, pod walls and seeds. While N concentrations were lower and C:N higher in green leaves under CO<sub>2</sub>
 enrichment, more N remained in the root until the final harvest. Under ambient CO<sub>2</sub>
 concentrations the harvestable product (seeds) contained 50.7%. 44.5% and 41 % of the total N supplied in the treatments that received 75, 150 and 225 kg ha<sup>-1</sup>
 N, respectively. Under elevated CO<sub>2</sub>
 these values decreased to 47.4%, 34.5% and 15% reducing the NUE of the seeds by 2%, 33% and 65%, respectively. In CO<sub>2</sub>
 exposed amply fertilised plants much of the N remained in the side stems due to strongoutbranching and reduced seed set. However, N remobilisation was more affected by the different N supply than by the CO<sub>2</sub>
 enrichment. The boosted growth of OSR under high availability of disrupted the source :sink relationships so that benefits from the CO<sub>2</sub>
 enrichment on stem and root growth could not be realised by yield formation.</s0>
</fC01>
<fC02 i1="01" i2="X"><s0>002A</s0>
</fC02>
<fC03 i1="01" i2="X" l="FRE"><s0>Facteur influence</s0>
<s5>01</s5>
</fC03>
<fC03 i1="01" i2="X" l="ENG"><s0>Influence factor</s0>
<s5>01</s5>
</fC03>
<fC03 i1="01" i2="X" l="SPA"><s0>Factor influencia</s0>
<s5>01</s5>
</fC03>
<fC03 i1="02" i2="X" l="FRE"><s0>Approvisionnement</s0>
<s5>02</s5>
</fC03>
<fC03 i1="02" i2="X" l="ENG"><s0>Supply</s0>
<s5>02</s5>
</fC03>
<fC03 i1="02" i2="X" l="SPA"><s0>Aprovisionamiento</s0>
<s5>02</s5>
</fC03>
<fC03 i1="03" i2="X" l="FRE"><s0>Augmentation</s0>
<s5>03</s5>
</fC03>
<fC03 i1="03" i2="X" l="ENG"><s0>Increase</s0>
<s5>03</s5>
</fC03>
<fC03 i1="03" i2="X" l="SPA"><s0>Aumentación</s0>
<s5>03</s5>
</fC03>
<fC03 i1="04" i2="X" l="FRE"><s0>Marquage isotopique</s0>
<s5>04</s5>
</fC03>
<fC03 i1="04" i2="X" l="ENG"><s0>Isotope labelling</s0>
<s5>04</s5>
</fC03>
<fC03 i1="04" i2="X" l="SPA"><s0>Marcación isotópica</s0>
<s5>04</s5>
</fC03>
<fC03 i1="05" i2="X" l="FRE"><s0>Rapport carbone azote</s0>
<s5>05</s5>
</fC03>
<fC03 i1="05" i2="X" l="ENG"><s0>Carbon nitrogen ratio</s0>
<s5>05</s5>
</fC03>
<fC03 i1="05" i2="X" l="SPA"><s0>Relación carbono nitrógeno</s0>
<s5>05</s5>
</fC03>
<fC03 i1="06" i2="X" l="FRE"><s0>Efficacité nutriment</s0>
<s5>06</s5>
</fC03>
<fC03 i1="06" i2="X" l="ENG"><s0>Nutrient recovery</s0>
<s5>06</s5>
</fC03>
<fC03 i1="06" i2="X" l="SPA"><s0>Eficacia nutrimento</s0>
<s5>06</s5>
</fC03>
<fC03 i1="07" i2="X" l="FRE"><s0>Relation source puits</s0>
<s5>07</s5>
</fC03>
<fC03 i1="07" i2="X" l="ENG"><s0>Source sink relationship</s0>
<s5>07</s5>
</fC03>
<fC03 i1="07" i2="X" l="SPA"><s0>Relación fuente sumidero</s0>
<s5>07</s5>
</fC03>
<fC03 i1="08" i2="X" l="FRE"><s0>Botanique</s0>
<s5>08</s5>
</fC03>
<fC03 i1="08" i2="X" l="ENG"><s0>Botany</s0>
<s5>08</s5>
</fC03>
<fC03 i1="08" i2="X" l="SPA"><s0>Botánica</s0>
<s5>08</s5>
</fC03>
<fC03 i1="09" i2="X" l="FRE"><s0>Brassica napus var. oleifera</s0>
<s2>NS</s2>
<s5>10</s5>
</fC03>
<fC03 i1="09" i2="X" l="ENG"><s0>Brassica napus var. oleifera</s0>
<s2>NS</s2>
<s5>10</s5>
</fC03>
<fC03 i1="09" i2="X" l="SPA"><s0>Brassica napus var. oleifera</s0>
<s2>NS</s2>
<s5>10</s5>
</fC03>
<fC03 i1="10" i2="X" l="FRE"><s0>Dioxyde de carbone</s0>
<s2>NK</s2>
<s2>FX</s2>
<s5>15</s5>
</fC03>
<fC03 i1="10" i2="X" l="ENG"><s0>Carbon dioxide</s0>
<s2>NK</s2>
<s2>FX</s2>
<s5>15</s5>
</fC03>
<fC03 i1="10" i2="X" l="SPA"><s0>Carbono dióxido</s0>
<s2>NK</s2>
<s2>FX</s2>
<s5>15</s5>
</fC03>
<fC03 i1="11" i2="X" l="FRE"><s0>Remobilisation</s0>
<s4>CD</s4>
<s5>96</s5>
</fC03>
<fC03 i1="11" i2="X" l="ENG"><s0>Remobilization</s0>
<s4>CD</s4>
<s5>96</s5>
</fC03>
<fC03 i1="11" i2="X" l="SPA"><s0>Remobilización</s0>
<s4>CD</s4>
<s5>96</s5>
</fC03>
<fC03 i1="12" i2="X" l="FRE"><s0>Azote 15</s0>
<s4>CD</s4>
<s5>97</s5>
</fC03>
<fC03 i1="12" i2="X" l="ENG"><s0>Nitrogen-15</s0>
<s4>CD</s4>
<s5>97</s5>
</fC03>
<fC03 i1="12" i2="X" l="SPA"><s0>Nitrógeno-15</s0>
<s4>CD</s4>
<s5>97</s5>
</fC03>
<fC03 i1="13" i2="X" l="FRE"><s0>Ecologie végétale</s0>
<s4>CD</s4>
<s5>98</s5>
</fC03>
<fC03 i1="13" i2="X" l="ENG"><s0>Plant ecology</s0>
<s4>CD</s4>
<s5>98</s5>
</fC03>
<fC03 i1="13" i2="X" l="SPA"><s0>Ecología vegetal</s0>
<s4>CD</s4>
<s5>98</s5>
</fC03>
<fC07 i1="01" i2="X" l="FRE"><s0>Cruciferae</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="01" i2="X" l="ENG"><s0>Cruciferae</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="01" i2="X" l="SPA"><s0>Cruciferae</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="02" i2="X" l="FRE"><s0>Dicotyledones</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="02" i2="X" l="ENG"><s0>Dicotyledones</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="02" i2="X" l="SPA"><s0>Dicotyledones</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="03" i2="X" l="FRE"><s0>Angiospermae</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="03" i2="X" l="ENG"><s0>Angiospermae</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="03" i2="X" l="SPA"><s0>Angiospermae</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="04" i2="X" l="FRE"><s0>Spermatophyta</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="04" i2="X" l="ENG"><s0>Spermatophyta</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="04" i2="X" l="SPA"><s0>Spermatophyta</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="05" i2="X" l="FRE"><s0>Plante oléagineuse</s0>
<s5>31</s5>
</fC07>
<fC07 i1="05" i2="X" l="ENG"><s0>Oil plant (vegetal)</s0>
<s5>31</s5>
</fC07>
<fC07 i1="05" i2="X" l="SPA"><s0>Planta oleaginosa</s0>
<s5>31</s5>
</fC07>
<fN21><s1>205</s1>
</fN21>
<fN44 i1="01"><s1>OTO</s1>
</fN44>
<fN82><s1>OTO</s1>
</fN82>
</pA>
</standard>
<server><NO>PASCAL 12-0275151 INIST</NO>
<ET>Allocation and remobilisation of nitrogen in spring oilseed rape (Brassica napus L. cv. Mozart) as affected by N supply and elevated CO<sub>2</sub>
</ET>
<AU>FRANZARING (J.); GENSHEIMER (G.); WELLER (S.); SCHMID (I.); FANGMEIER (A.)</AU>
<AF>Universität Hohenheim, Institut für Landschafts- und Pflanzenökologie (320), FG. Pflanzenökologie und Ökotoxikologie, Ökologiezentrum 2, August-von-Hartmann-Str. 3/70599 Stuttgart/Allemagne (1 aut., 2 aut., 3 aut., 4 aut., 5 aut.)</AF>
<DT>Publication en série; Niveau analytique</DT>
<SO>Environmental and experimental botany; ISSN 0098-8472; Coden EEBODM; Pays-Bas; Da. 2012; Vol. 83; Pp. 12-22; Bibl. 3/4 p.</SO>
<LA>Anglais</LA>
<EA>CO<sub>2</sub>
 enrichment interacts with the resource economy of plants, but time-integrated studies on N partitioning between different plant parts, C:N ratios and N remobilisation are mostly lacking. The present study addressed the nitrogen use efficiency (NUE) in spring oilseed rape (OSR) grown at three N fertilisation levels and two CO<sub>2</sub>
 concentrations (380 vs. 550 μmol mol<sup>-1</sup>
). N was supplied in three equal gifts at sowing, stem elongation and flowering. One of these gifts was labelled with <sup>15</sup>
NH<sub>4</sub>
<sup>15</sup>
NO<sub>3</sub>
 respectively. Six intermediate harvests and a final harvest were performed to determine dry mass, N concentrations. C:N, N recovery and δ<sup>15</sup>
N signatures in the plant fractions root, main stem, branches, green and senescent leaves, pod walls and seeds. While N concentrations were lower and C:N higher in green leaves under CO<sub>2</sub>
 enrichment, more N remained in the root until the final harvest. Under ambient CO<sub>2</sub>
 concentrations the harvestable product (seeds) contained 50.7%. 44.5% and 41 % of the total N supplied in the treatments that received 75, 150 and 225 kg ha<sup>-1</sup>
 N, respectively. Under elevated CO<sub>2</sub>
 these values decreased to 47.4%, 34.5% and 15% reducing the NUE of the seeds by 2%, 33% and 65%, respectively. In CO<sub>2</sub>
 exposed amply fertilised plants much of the N remained in the side stems due to strongoutbranching and reduced seed set. However, N remobilisation was more affected by the different N supply than by the CO<sub>2</sub>
 enrichment. The boosted growth of OSR under high availability of disrupted the source :sink relationships so that benefits from the CO<sub>2</sub>
 enrichment on stem and root growth could not be realised by yield formation.</EA>
<CC>002A</CC>
<FD>Facteur influence; Approvisionnement; Augmentation; Marquage isotopique; Rapport carbone azote; Efficacité nutriment; Relation source puits; Botanique; Brassica napus var. oleifera; Dioxyde de carbone; Remobilisation; Azote 15; Ecologie végétale</FD>
<FG>Cruciferae; Dicotyledones; Angiospermae; Spermatophyta; Plante oléagineuse</FG>
<ED>Influence factor; Supply; Increase; Isotope labelling; Carbon nitrogen ratio; Nutrient recovery; Source sink relationship; Botany; Brassica napus var. oleifera; Carbon dioxide; Remobilization; Nitrogen-15; Plant ecology</ED>
<EG>Cruciferae; Dicotyledones; Angiospermae; Spermatophyta; Oil plant (vegetal)</EG>
<SD>Factor influencia; Aprovisionamiento; Aumentación; Marcación isotópica; Relación carbono nitrógeno; Eficacia nutrimento; Relación fuente sumidero; Botánica; Brassica napus var. oleifera; Carbono dióxido; Remobilización; Nitrógeno-15; Ecología vegetal</SD>
<LO>INIST-9462.354000507981080020</LO>
<ID>12-0275151</ID>
</server>
</inist>
</record>

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Allocation and remobilisation of nitrogen in spring oilseed rape (Brassica napus L. cv. Mozart) as affected by N supply and elevated CO2

Allocation and remobilisation of nitrogen in spring oilseed rape (Brassica napus L. cv. Mozart) as affected by N supply and elevated CO2

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