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Impact of Soil Warming on the Plant Metabolome of Icelandic Grasslands

Impact of Soil Warming on the Plant Metabolome of Icelandic Grasslands

Title: Impact of Soil Warming on the Plant Metabolome of Icelandic Grasslands
Author: Gargallo-Garriga, Albert   orcid.org/0000-0002-7536-2888
Ayala-Roque, Marta
Sardans, Jordi   orcid.org/0000-0003-2478-0219
Bartrons, Mireia
Granda, Victor
Sigurdsson, Bjarni D.   orcid.org/0000-0002-4784-5233
Leblans, Niki   orcid.org/0000-0001-6154-1538
Oravec, Michal   orcid.org/0000-0002-2506-5826
Urban, Otmar
Janssens, Ivan   orcid.org/0000-0002-5705-1787
... 1 more authors Show all authors
Date: 2017-08-23
Language: English
Scope: 44
University/Institute: Landbúnaðarháskóli Íslands
Agricultural University of Iceland
Department: Auðlinda- og umhverfisdeild (LBHÍ)
Faculty of Natural Resources and Environmental Sciences (AUI)
Series: Metabolites;7(3)
ISSN: 2218-1989
DOI: 10.3390/metabo7030044
Subject: Biochemistry; Molecular Biology; Climate change; Lífefnafræði; Jarðvegur; Loftslagsbreytingar
URI: https://hdl.handle.net/20.500.11815/476

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Gargallo-Garriga, A., Ayala-Roque, M., Sardans, J., Bartrons, M., Granda, V., Sigurdsson, B., . . . Peñuelas, J. (2017). Impact of Soil Warming on the Plant Metabolome of Icelandic Grasslands. Metabolites, 7(3), 44. doi:10.3390/metabo7030044


Climate change is stronger at high than at temperate and tropical latitudes. The natural geothermal conditions in southern Iceland provide an opportunity to study the impact of warming on plants, because of the geothermal bedrock channels that induce stable gradients of soil temperature. We studied two valleys, one where such gradients have been present for centuries (long-term treatment), and another where new gradients were created in 2008 after a shallow crustal earthquake (short-term treatment). We studied the impact of soil warming (0 to +15 C) on the foliar metabolomes of two common plant species of high northern latitudes: Agrostis capillaris, a monocotyledon grass; and Ranunculus acris, a dicotyledonous herb, and evaluated the dependence of shifts in their metabolomes on the length of the warming treatment. The two species responded differently to warming, depending on the length of exposure. The grass metabolome clearly shifted at the site of long-term warming, but the herb metabolome did not. The main up-regulated compounds at the highest temperatures at the long-term site were saccharides and amino acids, both involved in heat-shock metabolic pathways. Moreover, some secondary metabolites, such as phenolic acids and terpenes, associated with a wide array of stresses, were also up-regulated. Most current climatic models predict an increase in annual average temperature between 2–8 C over land masses in the Arctic towards the end of this century. The metabolomes of A. capillaris and R. acris shifted abruptly and nonlinearly to soil warming >5 C above the control temperature for the coming decades. These results thus suggest that a slight warming increase may not imply substantial changes in plant function, but if the temperature rises more than 5 C, warming may end up triggering metabolic pathways associated with heat stress in some plant species currently dominant in this region.


This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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