期刊
NEW PHYTOLOGIST
卷 218, 期 2, 页码 479-491出版社
WILEY
DOI: 10.1111/nph.15016
关键词
alkanes; biomarker; cellulose; hydrogen isotopes; plant metabolism
资金
- ERC starting grant COSIWAX (ERC-2011-StG) [279518]
Hydrogen (H) isotope ratio (H-2) analyses of plant organic compounds have been applied to assess ecohydrological processes in the environment despite a large part of the H-2 variability observed in plant compounds not being fully elucidated. We present a conceptual biochemical model based on empirical H isotope data that we generated in two complementary experiments that clarifies a large part of the unexplained variability in the H-2 values of plant organic compounds. The experiments demonstrate that information recorded in the H-2 values of plant organic compounds goes beyond hydrological signals and can also contain important information on the carbon and energy metabolism of plants. Our model explains where H-2-fractionations occur in the biosynthesis of plant organic compounds and how these H-2-fractionations are tightly coupled to a plant's carbon and energy metabolism. Our model also provides a mechanistic basis to introduce H isotopes in plant organic compounds as a new metabolic proxy for the carbon and energy metabolism of plants and ecosystems. Such a new metabolic proxy has the potential to be applied in a broad range of disciplines, including plant and ecosystem physiology, biogeochemistry and palaeoecology.
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