Species variation in the hydrogen isotope composition of leaf cellulose is mostly driven by isotopic variation in leaf sucrose
JournalArticle (Originalarbeit in einer wissenschaftlichen Zeitschrift)
 
ID 4646992
Author(s) Holloway-Phillips, Meisha; Baan, Jochem; Nelson, Daniel B.; Lehmann, Marco M.; Tcherkez, Guillaume; Kahmen, Ansgar
Author(s) at UniBasel Kahmen, Ansgar
Holloway-Phillips, Meisha-Marika
Baan, Jochem
Nelson, Daniel
Year 2022
Title Species variation in the hydrogen isotope composition of leaf cellulose is mostly driven by isotopic variation in leaf sucrose
Journal Plant, Cell and Environment
Volume 45
Number 9
Pages / Article-Number 2636-2651
Mesh terms Cellulose; Hydrogen; Isotopes; Plant Leaves; Sucrose; Water
Abstract Experimental approaches to isolate drivers of variation in the carbon-bound hydrogen isotope composition (delta H-2) of plant cellulose are rare and current models are limited in their application. This is in part due to a lack in understanding of how H-2-fractionations in carbohydrates differ between species. We analysed, for the first time, the delta H-2 of leaf sucrose along with the delta H-2 and delta O-18 of leaf cellulose and leaf and xylem water across seven herbaceous species and a starchless mutant of tobacco. The delta H-2 of sucrose explained 66% of the delta H-2 variation in cellulose (R-2 = 0.66), which was associated with species differences in the H-2 enrichment of sucrose above leaf water ( epsilon sucrose \unicode{x003B5}sucrose: -126% to -192 parts per thousand) rather than by variation in leaf water delta H-2 itself. epsilon sucrose \unicode{x003B5}sucrose was positively related to dark respiration (R-2 = 0.27), and isotopic exchange of hydrogen in sugars was positively related to the turnover time of carbohydrates (R-2 = 0.38), but only when epsilon sucrose \unicode{x003B5}sucrose was fixed to the literature accepted value of - 171 \unicode{x02212}171 parts per thousand. No relation was found between isotopic exchange of hydrogen and oxygen, suggesting large differences in the processes shaping post-photosynthetic fractionation between elements. Our results strongly advocate that for robust applications of the leaf cellulose hydrogen isotope model, parameterization utilizing delta H-2 of sugars is needed.
ISSN/ISBN 365-3040
edoc-URL https://edoc.unibas.ch/89269/
Full Text on edoc No
Digital Object Identifier DOI 10.1111/pce.14362
PubMed ID http://www.ncbi.nlm.nih.gov/pubmed/35609972
ISI-Number 000824712400001
Document type (ISI) Journal Article
 
   

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09/12/2022