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  Eyes on the future – evidence for trade-offs between growth, storage and defense in Norway spruce

Huang, J., Hammerbacher, A., Weinhold, A., Reichelt, M., Gleixner, G., Behrendt, T., et al. (2019). Eyes on the future – evidence for trade-offs between growth, storage and defense in Norway spruce. New Phytologist, 222(1), 144-158. doi:10.1111/nph.15522.

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 Creators:
Huang, Jianbei1, 2, Author              
Hammerbacher, Almuth3, Author              
Weinhold, Alexander4, Author              
Reichelt, Michael3, Author              
Gleixner, Gerd5, Author              
Behrendt, Thomas6, Author              
van Dam, Nicole M., Author
Sala, Anna, Author
Gershenzon, Jonathan3, Author              
Trumbore, Susan E.6, Author              
Hartmann, Henrik1, Author              
Affiliations:
1Tree Mortality Mechanisms, Dr. H. Hartmann, Department Biogeochemical Processes, Prof. S. E. Trumbore, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1497781              
2IMPRS International Max Planck Research School for Global Biogeochemical Cycles, Max Planck Institute for Biogeochemistry, Max Planck Society, Hans-Knöll-Str. 10, 07745 Jena, DE, ou_1497757              
3Department of Biochemistry, Prof. J. Gershenzon, MPI for Chemical Ecology, Max Planck Society, ou_421893              
4Department of Molecular Ecology, Prof. I. T. Baldwin, MPI for Chemical Ecology, Max Planck Society, ou_24029              
5Molecular Biogeochemistry Group, Dr. G. Gleixner, Department Biogeochemical Processes, Prof. S. E. Trumbore, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1497775              
6Department Biogeochemical Processes, Prof. S. E. Trumbore, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1497752              

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 Abstract: Carbon (C) allocation plays a central role in tree responses to environmental changes. Yet, fundamental questions remain about how trees allocate C to different sinks, for example, growth vs storage and defense. To elucidate allocation priorities, we manipulated the whole‐tree C balance by modifying atmospheric CO2 concentrations ([CO2]) to create two distinct gradients of declining C availability, and compared how C was allocated among fluxes (respiration and volatile monoterpenes) and biomass C pools (total biomass, nonstructural carbohydrates (NSC) and secondary metabolites (SM)) in well‐watered Norway spruce (Picea abies) saplings. Continuous isotope labelling was used to trace the fate of newly‐assimilated C. Reducing [CO2] to 120 ppm caused an aboveground C compensation point (i.e. net C balance was zero) and resulted in decreases in growth and respiration. By contrast, soluble sugars and SM remained relatively constant in aboveground young organs and were partially maintained with a constant allocation of newly‐assimilated C, even at expense of root death from C exhaustion. We conclude that spruce trees have a conservative allocation strategy under source limitation: growth and respiration can be downregulated to maintain ‘operational’ levels of NSC while investing newly‐assimilated C into future survival by producing SM.

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 Dates: 2018-09-282018-10-052019
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Type: -
 Identifiers: Other: GER524
DOI: 10.1111/nph.15522
 Degree: -

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Title: New Phytologist
  Other : New Phytol.
Source Genre: Journal
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Publ. Info: London : Academic Press.
Pages: - Volume / Issue: 222 (1) Sequence Number: - Start / End Page: 144 - 158 Identifier: ISSN: 0028-646X
CoNE: https://pure.mpg.de/cone/journals/resource/954925334695