Impact of soil warming on the plant metabolome of Icelandic grasslands
Gargallo-Garriga, Albert (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Ayala-Roque, Marta (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Sardans i Galobart, Jordi (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Bartrons Vilamala, Mireia (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Granda, Víctor (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Sigurdsson, Bjarni D. (Landbúnaðarháskóli Íslands)
Leblans, Niki I. W. (Landbúnaðarháskóli Íslands)
Oravec, Michal (Ústav výzkumu globální změny AV ČR, v. v. i.)
Urban, Otmar (Ústav výzkumu globální změny AV ČR, v. v. i.)
Janssens, Ivan (Universiteit Antwerpen. Departement Biologie)
Peñuelas, Josep (Centre de Recerca Ecològica i d'Aplicacions Forestals)

Data:	2017
Resum:	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.
Ajuts:	European Commission 610028 Ministerio de Ciencia e Innovación CGL2016-79835 Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/274
Nota:	Altres ajuts: Scholarly Studies programme of the Smithsonian Institution, projects LM2015061 and LO1415 of the Ministry of Education, Youth and Sports of the Czech Republic, and the Research Foundation-Flanders (FWO aspirant grant to N.L.).
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Climate change ; Warming ; Geothermal bedrock channels ; Grassland ; Metabolome ; Iceland
Publicat a:	Metabolites, Vol. 7, issue 3 (Sep. 2017) , art. 44, ISSN 2218-1989

DOI: 10.3390/metabo7030044
PMID: 28832555

22 p, 3.0 MB

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