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Changes in 13 C/ 12 C of oil palm leaves to understand carbon use during their passage from heterotrophy to autotrophy
Author(s) -
Lamade Emmanuelle,
Setiyo Indra Eko,
Girard Sébastien,
Ghashghaie Jaleh
Publication year - 2009
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.4169
Subject(s) - elaeis guineensis , chemistry , heterotroph , autotroph , botany , sucrose , sugar , carbon fibers , isotopes of carbon , fructose , photosynthesis , respiration , horticulture , organic matter , total organic carbon , biology , palm oil , environmental chemistry , food science , bacteria , composite material , materials science , composite number , genetics , organic chemistry
The carbon isotope composition of leaf bulk organic matter was determined on the tropical tree Elaeis guineensis Jacq. (oil palm) in North Sumatra (Indonesia) to get a better understanding of the changes in carbon metabolism during the passage from heterotrophy to autotrophy of the leaves. Leaf soluble sugar (sucrose, glucose and fructose) contents, stomatal conductance and dark respiration, as well as leaf chlorophyll and nitrogen contents, were also investigated. Different growing stages were sampled from leaf rank −6 to rank 57. The mean values for the δ 13 C of bulk organic matter were −29.01 ± 0.9‰ for the leaflets during the autotrophic stage, −27.87 ± 1.08‰ for the petioles and −28.17 ± 1.09‰ for the rachises, which are in the range of expected values for a C 3 plant. The differences in δ 13 C among leaf ranks clearly revealed the changes in the origin of the carbon source used for leaf growth. Leaves were 13 C‐enriched at ranks below zero (around −27‰). During this period, the ‘spear’ leaves were completely heterotrophic and reserves from storage organs were mobilised for the growth of these young emerging leaves. 13 C‐depletion was then observed when the leaf was expanding at rank 1, and there was a continuous decrease during the progressive passage from heterotrophy until reaching full autotrophy. Thereafter, the δ 13 C remained more or less constant at around −29.5‰. Changes in sugar content and in δ 13 C related to leaf ranks showed an interesting similarity of the passage from heterotrophy to autotrophy of oil palm leaves to the budburst of some temperate trees or seed germination reported in the literature. Copyright © 2009 John Wiley & Sons, Ltd.