AustralieFrV1, PascalFrancis, Curation, bibRecord, 002C02

Experimental evidence for diel variations of the carbon isotope composition in leaf, stem and phloem sap organic matter in Ricinus communis

Identifieur interne : 002C02 ( PascalFrancis/Curation ); précédent : 002C01; suivant : 002C03

Experimental evidence for diel variations of the carbon isotope composition in leaf, stem and phloem sap organic matter in Ricinus communis

Auteurs : Arthur Gessler [Australie] ; Guillaume Tcherkez [Australie, France] ; Andreas D. Peuke [Australie] ; Jaleh Ghashghaie [France] ; Graham D. Farquhar [Australie]

Source :

Plant, cell and environment : (Print) [ 0140-7791 ] ; 2008.

RBID : Pascal:08-0325615

Descripteurs français

Pascal (Inist)
- Feuille végétal, Tige, Phloème, Matière organique, Amidon, Ricinus communis.
Wicri :
- topic : Amidon.

English descriptors

KwdEn :
- Organic matter, Phloem, Plant leaf, Ricinus communis, Starch, Stem.

Abstract

Carbon isotope fractionation in metabolic processes following carboxylation of ribulose-1,5-bisphosphate (RuBP) is not as well described as the discrimination during photosynthetic CO₂ fixation. However, post-carboxylation fractionation can influence the diel variation of δ¹³C of leaf-exported organic matter and can cause inter-organ differences in δ¹³C. To obtain a more mechanistic understanding of post-carboxylation modification of the isotopic signal as governed by physiological and environmental controls, we combined the modelling approach of Tcherkez et al., which describes the isotopic fractionation in primary metabolism with the experimental determination of δ¹³C in leaf and phloem sap and root carbon pools during a full diel course. There was a strong diel variation of leaf watersoluble organic matter and phloem sap sugars with relatively ¹³C depleted carbon produced and exported during the day and enriched carbon during the night. The isotopic modelling approach reproduces the experimentally determined day-night differences in δ¹³C of leaf-exported carbon in Ricinus communis. These findings support the idea that patterns of transitory starch accumulation and remobilization govern the diel rhythm of δ¹³C in organic matter exported by leaves. Integrated over the whole 24 h day, leaf-exported carbon was enriched in ¹³C as compared with the primary assimilates This may contribute to the well-known - yet poorly explained - relative ¹³C depletion of autotrophic organs compared with other plant parts. We thus emphasize the need to consider post-carboxylation fractionations for studies that use δ¹³C for assessing environmental effects like water availability on ratio of mole fractions of CO₂ inside and outside the leaf (e.g. tree ring studies), or for partitioning of CO₂ fluxes at the ecosystem level.

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A08	`01`	`1`	`ENG`	`@1 Experimental evidence for diel variations of the carbon isotope composition in leaf, stem and phloem sap organic matter in Ricinus communis`
A11	`01`	`1`		`@1 GESSLER (Arthur)`
A11	`02`	`1`		`@1 TCHERKEZ (Guillaume)`
A11	`03`	`1`		`@1 PEUKE (Andreas D.)`
A11	`04`	`1`		`@1 GHASHGHAIE (Jaleh)`
A11	`05`	`1`		`@1 FARQUHAR (Graham D.)`
A14	`01`			`@1 Environmental Biology Group, Research School of Biological Sciences, Australian National University, GPO Box 475 @2 Canberra, ACT 2601 @3 AUS @Z 1 aut. @Z 2 aut. @Z 5 aut.`
A14	`02`			`@1 Laboratoire d'Ecologie, Systématique et Evolution, Département d'Ecophysiologie Végétale, CNRS-UMR 8079, IFR 87, Centre scientifique d'Orsay, Bâtiment 362, Université Paris-Sud XI @2 91405 Orsay @3 FRA @Z 2 aut. @Z 4 aut.`
A14	`03`			`@1 School of Biological, Earth and Environmental Sciences, University of New South Wales @2 Sydney, New South Wales 2052 @3 AUS @Z 3 aut.`
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C01	`01`		`ENG`	@0 Carbon isotope fractionation in metabolic processes following carboxylation of ribulose-1,5-bisphosphate (RuBP) is not as well described as the discrimination during photosynthetic CO₂ fixation. However, post-carboxylation fractionation can influence the diel variation of δ¹³C of leaf-exported organic matter and can cause inter-organ differences in δ¹³C. To obtain a more mechanistic understanding of post-carboxylation modification of the isotopic signal as governed by physiological and environmental controls, we combined the modelling approach of Tcherkez et al., which describes the isotopic fractionation in primary metabolism with the experimental determination of δ¹³C in leaf and phloem sap and root carbon pools during a full diel course. There was a strong diel variation of leaf watersoluble organic matter and phloem sap sugars with relatively ¹³C depleted carbon produced and exported during the day and enriched carbon during the night. The isotopic modelling approach reproduces the experimentally determined day-night differences in δ¹³C of leaf-exported carbon in Ricinus communis. These findings support the idea that patterns of transitory starch accumulation and remobilization govern the diel rhythm of δ¹³C in organic matter exported by leaves. Integrated over the whole 24 h day, leaf-exported carbon was enriched in ¹³C as compared with the primary assimilates This may contribute to the well-known - yet poorly explained - relative ¹³C depletion of autotrophic organs compared with other plant parts. We thus emphasize the need to consider post-carboxylation fractionations for studies that use δ¹³C for assessing environmental effects like water availability on ratio of mole fractions of CO₂ inside and outside the leaf (e.g. tree ring studies), or for partitioning of CO₂ fluxes at the ecosystem level.
C02	`01`	`X`		`@0 002A10E02`
C03	`01`	`X`	`FRE`	`@0 Feuille végétal @5 01`
C03	`01`	`X`	`ENG`	`@0 Plant leaf @5 01`
C03	`01`	`X`	`SPA`	`@0 Hoja vegetal @5 01`
C03	`02`	`X`	`FRE`	`@0 Tige @5 02`
C03	`02`	`X`	`ENG`	`@0 Stem @5 02`
C03	`02`	`X`	`SPA`	`@0 Tallo @5 02`
C03	`03`	`X`	`FRE`	`@0 Phloème @5 03`
C03	`03`	`X`	`ENG`	`@0 Phloem @5 03`
C03	`03`	`X`	`SPA`	`@0 Liber @5 03`
C03	`04`	`X`	`FRE`	`@0 Matière organique @5 04`
C03	`04`	`X`	`ENG`	`@0 Organic matter @5 04`
C03	`04`	`X`	`SPA`	`@0 Materia orgánica @5 04`
C03	`05`	`X`	`FRE`	`@0 Amidon @5 05`
C03	`05`	`X`	`ENG`	`@0 Starch @5 05`
C03	`05`	`X`	`SPA`	`@0 Almidón @5 05`
C03	`06`	`X`	`FRE`	`@0 Ricinus communis @2 NS @5 10`
C03	`06`	`X`	`ENG`	`@0 Ricinus communis @2 NS @5 10`
C03	`06`	`X`	`SPA`	`@0 Ricinus communis @2 NS @5 10`
C07	`01`	`X`	`FRE`	`@0 Euphorbiaceae @2 NS`
C07	`01`	`X`	`ENG`	`@0 Euphorbiaceae @2 NS`
C07	`01`	`X`	`SPA`	`@0 Euphorbiaceae @2 NS`
C07	`02`	`X`	`FRE`	`@0 Dicotyledones @2 NS`
C07	`02`	`X`	`ENG`	`@0 Dicotyledones @2 NS`
C07	`02`	`X`	`SPA`	`@0 Dicotyledones @2 NS`
C07	`03`	`X`	`FRE`	`@0 Angiospermae @2 NS`
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C07	`03`	`X`	`SPA`	`@0 Angiospermae @2 NS`
C07	`04`	`X`	`FRE`	`@0 Spermatophyta @2 NS`
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N21				`@1 203`
N44	`01`			`@1 OTO`
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Le document en format XML

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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Organic matter</term>
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<front><div type="abstract" xml:lang="en">Carbon isotope fractionation in metabolic processes following carboxylation of ribulose-1,5-bisphosphate (RuBP) is not as well described as the discrimination during photosynthetic CO<sub>2</sub>
 fixation. However, post-carboxylation fractionation can influence the diel variation of δ<sup>13</sup>
C of leaf-exported organic matter and can cause inter-organ differences in δ<sup>13</sup>
C. To obtain a more mechanistic understanding of post-carboxylation modification of the isotopic signal as governed by physiological and environmental controls, we combined the modelling approach of Tcherkez et al., which describes the isotopic fractionation in primary metabolism with the experimental determination of δ<sup>13</sup>
C in leaf and phloem sap and root carbon pools during a full diel course. There was a strong diel variation of leaf watersoluble organic matter and phloem sap sugars with relatively <sup>13</sup>
C depleted carbon produced and exported during the day and enriched carbon during the night. The isotopic modelling approach reproduces the experimentally determined day-night differences in δ<sup>13</sup>
C of leaf-exported carbon in Ricinus communis. These findings support the idea that patterns of transitory starch accumulation and remobilization govern the diel rhythm of δ<sup>13</sup>
C in organic matter exported by leaves. Integrated over the whole 24 h day, leaf-exported carbon was enriched in <sup>13</sup>
C as compared with the primary assimilates This may contribute to the well-known - yet poorly explained - relative <sup>13</sup>
C depletion of autotrophic organs compared with other plant parts. We thus emphasize the need to consider post-carboxylation fractionations for studies that use δ<sup>13</sup>
C for assessing environmental effects like water availability on ratio of mole fractions of CO<sub>2</sub>
 inside and outside the leaf (e.g. tree ring studies), or for partitioning of CO<sub>2</sub>
 fluxes at the ecosystem level.</div>
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<fC01 i1="01" l="ENG"><s0>Carbon isotope fractionation in metabolic processes following carboxylation of ribulose-1,5-bisphosphate (RuBP) is not as well described as the discrimination during photosynthetic CO<sub>2</sub>
 fixation. However, post-carboxylation fractionation can influence the diel variation of δ<sup>13</sup>
C of leaf-exported organic matter and can cause inter-organ differences in δ<sup>13</sup>
C. To obtain a more mechanistic understanding of post-carboxylation modification of the isotopic signal as governed by physiological and environmental controls, we combined the modelling approach of Tcherkez et al., which describes the isotopic fractionation in primary metabolism with the experimental determination of δ<sup>13</sup>
C in leaf and phloem sap and root carbon pools during a full diel course. There was a strong diel variation of leaf watersoluble organic matter and phloem sap sugars with relatively <sup>13</sup>
C depleted carbon produced and exported during the day and enriched carbon during the night. The isotopic modelling approach reproduces the experimentally determined day-night differences in δ<sup>13</sup>
C of leaf-exported carbon in Ricinus communis. These findings support the idea that patterns of transitory starch accumulation and remobilization govern the diel rhythm of δ<sup>13</sup>
C in organic matter exported by leaves. Integrated over the whole 24 h day, leaf-exported carbon was enriched in <sup>13</sup>
C as compared with the primary assimilates This may contribute to the well-known - yet poorly explained - relative <sup>13</sup>
C depletion of autotrophic organs compared with other plant parts. We thus emphasize the need to consider post-carboxylation fractionations for studies that use δ<sup>13</sup>
C for assessing environmental effects like water availability on ratio of mole fractions of CO<sub>2</sub>
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<s5>02</s5>
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<fC03 i1="02" i2="X" l="ENG"><s0>Stem</s0>
<s5>02</s5>
</fC03>
<fC03 i1="02" i2="X" l="SPA"><s0>Tallo</s0>
<s5>02</s5>
</fC03>
<fC03 i1="03" i2="X" l="FRE"><s0>Phloème</s0>
<s5>03</s5>
</fC03>
<fC03 i1="03" i2="X" l="ENG"><s0>Phloem</s0>
<s5>03</s5>
</fC03>
<fC03 i1="03" i2="X" l="SPA"><s0>Liber</s0>
<s5>03</s5>
</fC03>
<fC03 i1="04" i2="X" l="FRE"><s0>Matière organique</s0>
<s5>04</s5>
</fC03>
<fC03 i1="04" i2="X" l="ENG"><s0>Organic matter</s0>
<s5>04</s5>
</fC03>
<fC03 i1="04" i2="X" l="SPA"><s0>Materia orgánica</s0>
<s5>04</s5>
</fC03>
<fC03 i1="05" i2="X" l="FRE"><s0>Amidon</s0>
<s5>05</s5>
</fC03>
<fC03 i1="05" i2="X" l="ENG"><s0>Starch</s0>
<s5>05</s5>
</fC03>
<fC03 i1="05" i2="X" l="SPA"><s0>Almidón</s0>
<s5>05</s5>
</fC03>
<fC03 i1="06" i2="X" l="FRE"><s0>Ricinus communis</s0>
<s2>NS</s2>
<s5>10</s5>
</fC03>
<fC03 i1="06" i2="X" l="ENG"><s0>Ricinus communis</s0>
<s2>NS</s2>
<s5>10</s5>
</fC03>
<fC03 i1="06" i2="X" l="SPA"><s0>Ricinus communis</s0>
<s2>NS</s2>
<s5>10</s5>
</fC03>
<fC07 i1="01" i2="X" l="FRE"><s0>Euphorbiaceae</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="01" i2="X" l="ENG"><s0>Euphorbiaceae</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="01" i2="X" l="SPA"><s0>Euphorbiaceae</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>
<fN21><s1>203</s1>
</fN21>
<fN44 i1="01"><s1>OTO</s1>
</fN44>
<fN82><s1>OTO</s1>
</fN82>
</pA>
</standard>
</inist>
</record>

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   |clé=     Pascal:08-0325615
   |texte=   Experimental evidence for diel variations of the carbon isotope composition in leaf, stem and phloem sap organic matter in Ricinus communis
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	Serveur d'exploration sur les relations entre la France et l'Australie
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Experimental evidence for diel variations of the carbon isotope composition in leaf, stem and phloem sap organic matter in Ricinus communis

Experimental evidence for diel variations of the carbon isotope composition in leaf, stem and phloem sap organic matter in Ricinus communis

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