Natural 13C distribution in oil palm (Elaeis guineensis Jacq.) and consequences for allocation pattern

Lamade Emmanuelle, Tcherkez Guillaume, Hijri Darlan Nuzul, Lobato Rodrigues Rosario, Fresneau Chantal, Mauve Caroline, Lamothe-Sibold Marlène, Sketriené Diana, Ghashghaie Jaleh. 2016. Natural 13C distribution in oil palm (Elaeis guineensis Jacq.) and consequences for allocation pattern. Plant, Cell and Environment, 39 (1) : 199-212.

Quartile : Outlier, Sujet : PLANT SCIENCES

Résumé : Oil palm has now become one of the most important crops, palm oil representing nearly 25% of global plant oil consumption. Many studies have thus addressed oil palm ecophysiology and photosynthesis-based models of carbon allocation have been used. However, there is a lack of experimental data on carbon fixation and redistribution within palm trees, and important C-sinks have not been fully characterized yet. Here, we carried out extensive measurement of natural 13C-abundance (δ13C) in oil palm tissues, including fruits at different maturation stages. We find a 13C-enrichment in heterotrophic organs compared to mature leaves, with roots being the most 13C-enriched. The δ13C in fruits decreased during maturation, reflecting the accumulation in 13C-depleted lipids. We further used observed δ13C values to compute plausible carbon fluxes using a steady-state model of 13C-distribution including metabolic isotope effects (12v/13v). The results suggest that fruits represent a major respiratory loss (≈39% of total tree respiration) and that sink organs such as fruits are fed by sucrose from leaves. That is, glucose appears to be a quantitatively important compound in palm tissues, but computations indicate that it is involved in dynamic starch metabolism rather that C-exchange between organs.

Mots-clés Agrovoc : Elaeis guineensis, carbone, physiologie végétale, photosynthèse, huile de palme, isotope naturel, composition chimique, feuille, tissu végétal, respiration cellulaire

Mots-clés géographiques Agrovoc : Indonésie, Sumatra

Mots-clés libres : Carbon allocation, Isotope composition, Oleosynthesis cost, Respiratory losses, 13C-12C fractionation, Oil palm

Classification Agris : F60 - Physiologie et biochimie végétale

Champ stratégique Cirad : Axe 1 (2014-2018) - Agriculture écologiquement intensive

Auteurs et affiliations

• Lamade Emmanuelle, CIRAD-PERSYST-UPR Systèmes de pérennes (FRA) ORCID: 0000-0002-4909-0997
• Tcherkez Guillaume, ANU (AUS)
• Hijri Darlan Nuzul, IOPRI (IDN)
• Lobato Rodrigues Rosario, EMBRAPA (BRA)
• Fresneau Chantal, CNRS (FRA)
• Mauve Caroline, Université Paris-Sud (FRA)
• Lamothe-Sibold Marlène, Université Paris-Sud (FRA)
• Sketriené Diana, CNRS (FRA)
• Ghashghaie Jaleh, CNRS (FRA)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/579593/)

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