Changes in δ C-13 of dark respired CO2 and organic matter of different organs during early ontogeny in peanut plants
2015
Ghashghaie, Jaleh | Werner Badeck, Franz | Girardin, Cyril | Sketriene, Diana | Lamothe-Sibold, Marlene | Werner, Roland, A | Ecologie Systématique et Evolution (ESE) ; Université Paris-Sud - Paris 11 (UP11)-AgroParisTech-Centre National de la Recherche Scientifique (CNRS) | Genomics research centre ; Consiglio per la Ricerca in Agricoltura e l’analisi dell’economia agraria = Council for Agricultural Research and Economics (CREA) | Ecologie fonctionnelle et écotoxicologie des agroécosystèmes (ECOSYS) ; Institut National de la Recherche Agronomique (INRA)-AgroParisTech | Institut des Sciences des Plantes de Paris-Saclay (IPS2 (UMR_9213 / UMR_1403)) ; Université d'Évry-Val-d'Essonne (UEVE)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) | Institute of Agricultural Sciences [Zürich] ; Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich) | Laboratoire d'Ecologie, Systematique et Evolution (ESE, CNRS-UMR) at the University of Paris-Sud (Orsay) [8079]
Carbon isotope composition in respired CO2 and organic matter of individual organs were measured on peanut seedlings during early ontogeny in order to compare fractionation during heterotrophic growth and transition to autotrophy in a species with lipid seed reserves with earlier results obtained on beans. Despite a high lipid content in peanut seeds (48 %) compared with bean seeds (1.5 %), the isotope composition of leaf- and root-respired CO2 as well as its changes during ontogeny were similar to already published data on bean seedlings: leaf-respired CO2 became C-13-enriched reaching -21.5 parts per thousand, while root-respired CO2 became C-13-depleted reaching around -31 parts per thousand at the four-leaf stage. The opposite respiratory fractionation in leaves vs. roots already reported for C-3 herbs was thus confirmed for peanuts. However, contrarily to beans, the peanut cotyledon-respired CO2 was markedly C-13-enriched, and its C-13-depletion was noted from the two-leaf stage onwards only. Carbohydrate amounts being very low in peanut seeds, this cannot be attributed solely to their use as respiratory substrate. The potential role of isotope fractionation during glyoxylate cycle and/or gluconeogenesis on the C-13-enriched cotyledon-respired CO2 is discussed.
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