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- W2110363088 endingPage "795" @default.
- W2110363088 startingPage "780" @default.
- W2110363088 abstract "The analysis of δ13C and δ18O in tree-ring archives offers retrospective insights into environmental conditions and ecophysiological processes. While photosynthetic carbon isotope discrimination and evaporative oxygen isotope enrichment are well understood, we lack information on how the isotope signal is altered by downstream metabolic processes. In Pinus sylvestris, we traced the isotopic signals from their origin in the leaf water (δ18O) or the newly assimilated carbon (δ13C), via phloem sugars to the tree-ring, over a time-scale that ranges from hours to a growing season. Seasonally, variable 13C enrichment of sugars related to phloem loading and transport did lead to uncoupling between δ13C in the tree-ring, and the ci/ca ratio at the leaf level. In contrast, the oxygen isotope signal was transferred from the leaf water to the tree-ring with an expected enrichment of 27‰, with time-lags of approximately 2 weeks and with a 40% exchange between organic oxygen and xylem water oxygen during cellulose synthesis. This integrated overview of the fate of carbon and oxygen isotope signals within the model tree species P. sylvestris provides a novel physiological basis for the interpretation of δ13C and δ18O in tree-ring ecology." @default.
- W2110363088 created "2016-06-24" @default.
- W2110363088 creator A5003331751 @default.
- W2110363088 creator A5004935180 @default.
- W2110363088 creator A5017390834 @default.
- W2110363088 creator A5020330064 @default.
- W2110363088 creator A5054037455 @default.
- W2110363088 creator A5077323678 @default.
- W2110363088 date "2009-07-01" @default.
- W2110363088 modified "2023-10-14" @default.
- W2110363088 title "Tracing carbon and oxygen isotope signals from newly assimilated sugars in the leaves to the tree-ring archive" @default.
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