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Living on next to nothing: tree seedlings can survive weeks with very low carbohydrate concentrations

MPG-Autoren
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Lambert,  Savoyane
Tree Mortality Mechanisms, Dr. H. Hartmann, Department Biogeochemical Processes, Prof. S. E. Trumbore, Max Planck Institute for Biogeochemistry, Max Planck Society;

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Hartmann,  Henrik
Tree Mortality Mechanisms, Dr. H. Hartmann, Department Biogeochemical Processes, Prof. S. E. Trumbore, Max Planck Institute for Biogeochemistry, Max Planck Society;

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Zitation

Weber, R., Schwendener, A., Schmid, S., Lambert, S., Wiley, E., Landhäusser, S. M., et al. (2018). Living on next to nothing: tree seedlings can survive weeks with very low carbohydrate concentrations. New Phytologist, 218(1), 107-118. doi:10.1111/nph.14987.


Zitierlink: https://hdl.handle.net/21.11116/0000-0000-737C-4
Zusammenfassung
The usage of nonstructural carbohydrates (NSCs) to indicate carbon (C) limitation in trees requires knowledge of the minimum tissue NSC concentrations at lethal C starvation, and the NSC dynamics during and after severe C limitation. We completely darkened and subsequently released seedlings of two deciduous and two evergreen temperate tree species for varying periods. NSCs were measured in all major organs, allowing assessment of whole-seedling NSC balances. NSCs decreased fast in darkness, but seedlings survived species-specific whole-seedling starch concentrations as low as 0.4–0.8% per dry matter (DM), and sugar (sucrose, glucose and fructose) concentrations as low as 0.5–2.0% DM. After re-illumination, the refilling of NSC pools began within 3 wk, while the resumption of growth was delayed or restricted. All seedlings had died after 12 wk of darkness, and starch and sugar concentrations in most tissues were lower than 1% DM. We conclude that under the applied conditions, tree seedlings can survive several weeks with very low NSC reserves probably also using alternative C sources like lipids, proteins or hemicelluloses; lethal C starvation cannot be assumed, if NSC concentrations are higher than the minimum concentrations found in surviving seedlings; and NSC reformation after reillumination occurs preferentially over growth