Data Entry: Please note that the research database will be replaced by UNIverse by the end of October 2023. Please enter your data into the system https://universe-intern.unibas.ch. Thanks

Login for users with Unibas email account...

Login for registered users without Unibas email account...

 
Oxygen isotope fractionations across individual leaf carbohydrates in grass and tree species
JournalArticle (Originalarbeit in einer wissenschaftlichen Zeitschrift)
 
ID 3882718
Author(s) Lehmann, Marco M.; Gamarra, Bruno; Kahmen, Ansgar; Siegwolf, Rolf T. W.; Saurer, Matthias
Author(s) at UniBasel Kahmen, Ansgar
Year 2017
Title Oxygen isotope fractionations across individual leaf carbohydrates in grass and tree species
Journal Plant, Cell and Environment
Volume 40
Number 8
Pages / Article-Number 1658-1670
Abstract Almost no δ(18) O data are available for leaf carbohydrates, leaving a gap in the understanding of the δ(18) O relationship between leaf water and cellulose. We measured δ(18) O values of bulk leaf water (δ(18) OLW ) and individual leaf carbohydrates (e.g. fructose, glucose and sucrose) in grass and tree species and δ(18) O of leaf cellulose in grasses. The grasses were grown under two relative humidity (rH) conditions. Sucrose was generally (18) O-enriched compared with hexoses across all species with an apparent biosynthetic fractionation factor (εbio ) of more than 27‰ relative to δ(18) OLW , which might be explained by isotopic leaf water and sucrose synthesis gradients. δ(18) OLW and δ(18) O values of carbohydrates and cellulose in grasses were strongly related, indicating that the leaf water signal in carbohydrates was transferred to cellulose (εbio =†25.1‰). Interestingly, damping factor pex px , which reflects oxygen isotope exchange with less enriched water during cellulose synthesis, responded to rH conditions if modelled from δ(18) OLW but not if modelled directly from δ(18) O of individual carbohydrates. We conclude that δ(18) OLW is not always a good substitute for δ(18) O of synthesis water due to isotopic leaf water gradients. Thus, compound-specific δ(18) O analyses of individual carbohydrates are helpful to better constrain (post-)photosynthetic isotope fractionation processes in plants.
Publisher Wiley
ISSN/ISBN 0140-7791 ; 1365-3040
edoc-URL http://edoc.unibas.ch/55708/
Full Text on edoc No
Digital Object Identifier DOI 10.1111/pce.12974
PubMed ID http://www.ncbi.nlm.nih.gov/pubmed/28436078
ISI-Number 000405275300031
Document type (ISI) Journal Article
 
   

MCSS v5.8 PRO. 0.428 sec, queries - 0.000 sec ©Universität Basel  |  Impressum   |    
23/02/2024