Winter's bite: beech trees survive complete defoliation due to spring late-frost damage by mobilizing old C reserves

Late frost can destroy the photosynthetic apparatus of trees. We hypothesized that this can alter the normal cyclic dynamics of C-reserves in the wood. We measured soluble sugar concentrations and radiocarbon signatures (Δ14C) of soluble nonstructural carbon (NSC) in woody tissues sampled from a Mediterranean beech forest that was completely defoliated by an exceptional late frost in 2016. We used the bomb radiocarbon approach to estimate the time elapsed since fixation of mobilized soluble sugars. During the leafless period after the frost event, soluble sugar concentrations declined sharply while Δ14C of NSC increased. This can be explained by the lack of fresh assimilate supply and a mobilization of C from reserve pools. Soluble NSC became increasingly older during the leafless period, with a maximum average age of 5 yr from samples collected 27 d before canopy recovery. Following leaf re-growth, soluble sugar concentrations increased and Δ14C of soluble NSC decreased, indicating the allocation of new assimilates to the stem soluble sugars pool. These data highlight that beech trees rapidly mobilize reserve C to survive strong source–sink imbalances, for example due to late frost, and show that NSC is a key trait for tree resilience under global change. © 2019 The Authors. New Phytologist © 2019 New Phytologist Trust

Authors
D'Andrea E.1 , Rezaie N.1 , Battistelli A.2 , Gavrichkova O. 2, 3 , Kuhlmann I.4 , Matteucci G.1 , Moscatello S.2 , Proietti S.2 , Scartazza A.5 , Trumbore S.4 , Muhr J.4, 6
Journal
Publisher
Blackwell Publishing Ltd
Number of issue
2
Language
English
Pages
625-631
Status
Published
Volume
224
Year
2019
Organizations
  • 1 CNR-ISAFOM, via Patacca 2, Ercolano, 80056, Italy
  • 2 CNR-IRET, via Marconi 2, Porano, 05010, Italy
  • 3 Agro-Technology Institute, Peoples Friendship University of Russia, Moscow, 117198, Russian Federation
  • 4 Max-Planck-Institute for Biogeochemistry, Hans-Knöll-Str. 10, Jena, 07745, Germany
  • 5 CNR-IRET, Via Moruzzi 1, Pisa, 56124, Italy
  • 6 Bioclimatology, University of Göttingen, Büsgenweg 2, Göttingen, 37077, Germany
Keywords
bomb-radiocarbon (14C); extreme weather event; Fagus sylvatica; late-frost leaf damage; nonstructural carbon; resilience
Date of creation
24.12.2019
Date of change
24.12.2019
Short link
https://repository.rudn.ru/en/records/article/record/55004/
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