Species variation in the hydrogen isotope composition of leaf cellulose is mostly driven by isotopic variation in leaf sucrose

Holloway-Phillips, Meisha and Baan, Jochem and Nelson, Daniel B. and Lehmann, Marco M. and Tcherkez, Guillaume and Kahmen, Ansgar. (2022) Species variation in the hydrogen isotope composition of leaf cellulose is mostly driven by isotopic variation in leaf sucrose. Plant, Cell and Environment, 45 (9). pp. 2636-2651.

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Official URL: https://edoc.unibas.ch/89269/

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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.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Integrative Biologie > Physiological Plant Ecology (Kahmen)
UniBasel Contributors:Kahmen, Ansgar and Holloway-Phillips, Meisha-Marika and Baan, Jochem and Nelson, Daniel
Item Type:Article, refereed
Article Subtype:Research Article
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:06 Sep 2022 09:40
Deposited On:06 Sep 2022 09:40

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