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

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.

Bibliographic Details

Main Authors:	Lamade, Emmanuelle, Tcherkez, Guillaume, Hijri Darlan, Nuzul, Lobato Rodrigues, Rosario, Fresneau, Chantal, Mauve, Caroline, Lamothe-Sibold, Marlène, Sketriené, Diana, Ghashghaie, Jaleh
Format:	article biblioteca
Language:	eng
Subjects:	F60 - Physiologie et biochimie végétale, Elaeis guineensis, carbone, physiologie végétale, photosynthèse, huile de palme, isotope naturel, composition chimique, feuille, tissu végétal, respiration cellulaire, http://aims.fao.org/aos/agrovoc/c_2509, http://aims.fao.org/aos/agrovoc/c_1301, http://aims.fao.org/aos/agrovoc/c_25189, http://aims.fao.org/aos/agrovoc/c_5812, http://aims.fao.org/aos/agrovoc/c_5514, http://aims.fao.org/aos/agrovoc/c_32679, http://aims.fao.org/aos/agrovoc/c_1794, http://aims.fao.org/aos/agrovoc/c_4243, http://aims.fao.org/aos/agrovoc/c_27990, http://aims.fao.org/aos/agrovoc/c_6527, http://aims.fao.org/aos/agrovoc/c_3840, http://aims.fao.org/aos/agrovoc/c_7518,
Online Access:	http://agritrop.cirad.fr/579593/ http://agritrop.cirad.fr/579593/1/Lamade_et_al-2016-Plant%2C_Cell_%26_Environment.pdf
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