Homeostatic levels of nonstructural carbohydrates after 13 yr of drought and irrigation in Pinus sylvestris

The New Phytologist
Leonie SchönbeckMai-He Li

Abstract

Nonstructural carbohydrates (NSCs) are important for the growth and survival of trees. Drought may lead to a decrease in tree growth and to NSC depletion, whereas increased soil moisture in otherwise dry ecosystems may increase growth and NSC concentrations. A long-term (13 yr) irrigation experiment was conducted in a Pinus sylvestris-dominated forest located at the dry margin of the species in southern Switzerland. We measured the relative leaf area, growth, NSCs, needle δ13 C, [N] and [P] in trees on control and irrigated plots. Irrigation resulted in higher growth rates and carbon isotope discrimination, but did not alter NSC levels. Growth and NSC decreased with decreasing leaf area in both treatments, but NSC did not correlate with leaf-level gas exchange indices, such as foliar δ13 C, [N] or [P]. A legacy effect was shown, as trees with initially low leaf area had limited ability to respond to prolonged irrigation. The NSC constancy across treatments provides evidence that carbohydrate storage may stay constant when climate changes are sufficiently slow to allow acclimation. Moreover, we speculate that total leaf area, rather than leaf gas exchange per unit leaf area, drives the variation in whole-tree carbohydrate dynami...Continue Reading

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Citations

Jun 25, 2019·Frontiers in Plant Science·Ivano BrunnerArthur Gessler
Sep 23, 2020·Proceedings of the National Academy of Sciences of the United States of America·Jobin JosephArthur Gessler
Nov 11, 2020·Trends in Plant Science·Flurin BabstRichard L Peters
Aug 10, 2021·Ecology and Evolution·Roksolana PetrovskaMartina Lena Hobi
Sep 1, 2021·Plant, Cell & Environment·Petra D'OdoricoIngo Ensminger

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