δ13 C of organic matter transported from the leaves to the roots in Eucalyptus delegatensis: short-term variations and relation to respired CO2

Functional Plant Biology : FPB
Arthur GesslerGraham D Farquhar

Abstract

Post-photosynthetic carbon isotope fractionation might alter the isotopic signal imprinted on organic matter (OM) during primary carbon fixation by Rubisco. To characterise the influence of post-photosynthetic processes, we investigated the effect of starch storage and remobilisation on the stable carbon isotope signature (δ13C) of different carbon pools in the Eucalyptus delegatensis R. T. Baker leaf and the potential carbon isotope fractionation associated with phloem transport and respiration. Twig phloem exudate and leaf water-soluble OM showed diel variations in δ13C of up to 2.5 and 2‰, respectively, with 13C enrichment during the night and depletion during the day. Damped diel variation was also evident in bulk lipids of the leaf and in the leaf wax fraction. δ13C of nocturnal phloem exudate OM corresponded with the δ13C of carbon released from starch. There was no change in δ13C of phloem carbon along the trunk. CO2 emitted from trunks and roots was 13C enriched compared with the potential organic substrate, and depleted compared with soil-emitted CO2. The results are consistent with transitory starch accumulation and remobilisation governing the diel rhythm of δ13C in phloem-transported OM and fragmentation fractionati...Continue Reading

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Citations

Jul 21, 2009·Rapid Communications in Mass Spectrometry : RCM·Emmanuelle LamadeJaleh Ghashghaie
Jun 29, 2010·Tree Physiology·Jürgen Kreuzwieser, Arthur Gessler
Apr 15, 2010·Rapid Communications in Mass Spectrometry : RCM·Claire L PhillipsBarbara J Bond
Dec 2, 2010·Plant, Cell & Environment·Yann SalmonNina Buchmann
Nov 21, 2013·The New Phytologist·Jaleh Ghashghaie, Franz W Badeck
Mar 11, 2016·Tree Physiology·Andrew Merchant
Feb 26, 2010·Isotopes in Environmental and Health Studies·Kadmiel MaseykMaurizio Mencuccini
Jul 16, 2009·Rapid Communications in Mass Spectrometry : RCM·Andreas RichterGerd Gleixner
Nov 13, 2010·Tree Physiology·Katherine G RascherChristiane Werner
May 11, 2011·Plant, Cell & Environment·Nerea Ubierna, John D Marshall
Aug 17, 2010·The New Phytologist·Zachary KaylerNina Buchmann
May 8, 2013·The New Phytologist·Douglas J LynchMiquel A Gonzalez-Meler
Feb 21, 2019·Journal of Experimental Botany·Marco M LehmannRoland A Werner
Jun 1, 2008·Functional Plant Biology : FPB·Iker AranjueloSalvador Nogués
Jan 20, 2010·Plant, Cell & Environment·Guillaume TcherkezJaleh Ghashghaie

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