Allocation to carbon storage pools in Norway spruce saplings under drought and low CO2

Tree Physiology
Henrik HartmannSusan Trumbore

Abstract

Non-structural carbohydrates (NSCs) are critical to maintain plant metabolism under stressful environmental conditions, but we do not fully understand how NSC allocation and utilization from storage varies with stress. While it has become established that storage allocation is unlikely to be a mere overflow process, very little empirical evidence has been produced to support this view, at least not for trees. Here we present the results of an intensively monitored experimental manipulation of whole-tree carbon (C) balance (young Picea abies (L.) H Karst.) using reduced atmospheric [CO2] and drought to reduce C sources. We measured specific C storage pools (glucose, fructose, sucrose, starch) over 21 weeks and converted concentration measurement into fluxes into and out of the storage pool. Continuous labeling ((13)C) allowed us to track C allocation to biomass and non-structural C pools. Net C fluxes into the storage pool occurred mainly when the C balance was positive. Storage pools increased during periods of positive C gain and were reduced under negative C gain. (13)C data showed that C was allocated to storage pools independent of the net flux and even under severe C limitation. Allocation to below-ground tissues was stron...Continue Reading

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Citations

Feb 4, 2016·The New Phytologist·Arthur Gessler, Kerstin Treydte
Jun 4, 2015·Current Opinion in Plant Biology·Christian Körner
Dec 16, 2016·Tree Physiology·Heidi AaltonenJukka Pumpanen
Mar 11, 2016·Tree Physiology·Andrew Merchant
Sep 23, 2020·Proceedings of the National Academy of Sciences of the United States of America·Jobin JosephArthur Gessler
Apr 25, 2021·Plant Physiology·Peipei ZhangVanessa L Bailey

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