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Title:Different belowground responses to elevated ozone and soil water deficit in three European oak species (Quercus ilex, Q. pubescens and Q. robur)
Authors:Mrak, Tanja (Author)
Štraus, Ines (Author)
Grebenc, Tine (Author)
Gričar, Jožica (Author)
Hoshika, Yasutomo (Author)
Carriero, Giulia (Author)
Paoletti, Elena (Author)
Kraigher, Hojka (Author)
Language:English
Tipology:1.01 - Original Scientific Article
Organisation:Logo SciVie - Slovenian Forestry Institute
Abstract:Effects on roots due to ozone and/or soil water deficit often occur through diminished belowground allocation of carbon. Responses of root biomass, morphology, anatomy and ectomycorrhizal communities were investigated in seedlings of three oak species: Quercus ilex L., Q. pubescens Willd. and Q. robur L., exposed to combined effects of elevated ozone (ambient air and 1.4 x ambient air) and water deficit (100% and 10% irrigation relative to field capacity) for one growing season at a free-air ozone exposure facility. Effects on root biomass were observed as general reduction in coarse root biomass by -26.8 % and in fine root biomass by -13.1 % due to water deficit. Effect on coarse root biomass was the most prominent in Q. robur (-36.3 %). Root morphological changes manifested as changes in proportions of fine root (<2 mm) diameter classes due to ozone and water deficit in Q. pubescens and due to water deficit in Q. robur. In addition, reduced fine root diameter (-8.49 %) in Q. robur was observed under water deficit. Changes in root anatomy were observed as increased vessel density (+18.5 %) due to ozone in all three species, as reduced vessel tangential diameter (-46.7 %) in Q. ilex due to interaction of ozone and water, and as generally increased bark to secondary xylem ratio (+47.0 %) due to interaction of ozone and water. Water deficit influenced occurrence of distinct growth ring boundaries in roots of Q. ilex and Q. robur. It shifted the ectomycorrhizal community towards dominance of stress-resistant species, with reduced relative abundance of Tomentella sp. 2 and increased relative abundances of Sphaerosporella brunnea and Thelephora sp. Our results provide evidence that expression of stress effects varies between root traits; therefore the combined analysis of root traits is necessary to obtain a complete picture of belowground responses.
Keywords:ozone, drought, fine roots, ectomycorrhiza, anatomy, morphology, plants
Year of publishing:2019
COBISS_ID:5189798 Link is opened in a new window
UDC:630*16:630*11
ISSN on article:0048-9697
OceCobissID:26369024 Link is opened in a new window
DOI:10.1016/j.scitotenv.2018.09.246 Link is opened in a new window
Note:Soavtorji: Ines Štraus, Tine Grebenc, Jožica Gričar, Yasutomo Hoshika, Giulia Carriero, Elena Paoletti, Hojka Kraigher;
Views:1209
Downloads:675
Files:URL URL - Presentation file, visit https://doi.org/10.1016/j.scitotenv.2018.09.246
.pdf PDF - Presentation file, download (1,03 MB)
 
Journal:Sci. total environ.
Elsevier
 
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Document is financed by a project

Funder:EC - European Commission
Funding Programme:FP7
Project no.:315982
Name:European Forest Research and Innovation
Acronym:EUFORINNO

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