| Title: | "Eyes on the future - evidence for trade-offs between growth, storage and defense in Norway spruce" |
| Author(s): | Huang J; Hammerbacher A; Weinhold A; Reichelt M; Gleixner G; Behrendt T; van Dam NM; Sala A; Gershenzon J; Trumbore S; Hartmann H; |
| Address: | "Max Planck Institute for Biogeochemistry, Hans-Knoll-Str. 10, 07745, Jena, Germany. Max Planck Institute for Chemical Ecology, Hans-Knoll-Str. 8, 07745, Jena, Germany. Department of Zoology and Entomology, Forestry and Agricultural Biotechnology Institute, University of Pretoria, Private Bag X20, 0028, Pretoria, South Africa. German Centre for Integrative Biodiversity Research, Deutscher Platz 5e, 04103, Leipzig, Germany. Institute of Biodiversity, Friedrich Schiller University, Dornburger-Str. 159, 07743, Jena, Germany. Division of Biological Sciences, The University of Montana, Missoula, MT, 59812, USA" |
| ISSN/ISBN: | 1469-8137 (Electronic) 0028-646X (Linking) |
| 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. In order to elucidate allocation priorities, we manipulated the whole-tree C balance by modifying atmospheric CO(2) concentrations [CO(2) ] 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 [CO(2) ] 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' concentrations of NSC while investing newly-assimilated C into future survival by producing SM" |
| Keywords: | Atmosphere/chemistry Biomass Carbon Dioxide/metabolism Carbon Isotopes/metabolism Phenols/metabolism Picea/*growth & development/*immunology Plant Stems/metabolism Solubility Starch/metabolism Sugars/metabolism Terpenes/metabolism Time Factors Co2 Norway; |
| Notes: | "MedlineHuang, Jianbei Hammerbacher, Almuth Weinhold, Alexander Reichelt, Michael Gleixner, Gerd Behrendt, Thomas van Dam, Nicole M Sala, Anna Gershenzon, Jonathan Trumbore, Susan Hartmann, Henrik eng England 2018/10/06 New Phytol. 2019 Apr; 222(1):144-158. doi: 10.1111/nph.15522. Epub 2018 Nov 5" |
