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Title:Isotopic and water relation responses to ozone and water stress in seedlings of three oak species with different adaptation strategies
Authors:Cocozza, Claudia (Author)
Paoletti, Elena (Author)
Mrak, Tanja (Author)
Zavadlav, Saša (Author)
Levanič, Tom (Author)
Kraigher, Hojka (Author)
Giovannelli, Alessio (Author)
Hoshika, Yasutomo (Author)
Language:English
Tipology:1.01 - Original Scientific Article
Organisation:Logo SciVie - Slovenian Forestry Institute
Abstract:The impact of global changes on forest ecosystem processes is based on the species-specific responses of trees to the combined effect of multiple stressors and the capacity of each species to acclimate and cope with the environment modification. Combined environmental constraints can severely affect plant and ecological processes involved in plant functionality. This study provides novel insights into the impact of a simultaneous pairing of abiotic stresses (i.e., water and ozone (O3) stress) on the responses of oak species. Water stress (using 40 and 100% of soil water content at field capacity - WS and WW treatments, respectively) and O3 exposure (1.0, 1.2, and 1.4 times the ambient concentration - AA, 1.2AA, and 1.4AA, respectively) were carried out on Quercus robur L., Quercus ilex L., and Quercus pubescens Willd. seedlings, to study physiological traits (1. isotope signature [delta 13C, delta 18O and delta 15N], 2. water relation [leaf water potential, leaf water content], 3. leaf gas exchange [light-saturated net photosynthesis, Asat, and stomatal conductance, gs]) for adaptation strategies in a Free-Air Controlled Exposure (FACE) experiment. Ozone decreased Asat in Q. robur and Q. pubescens while water stress decreased it in all three oak species. Ozone did not affect delta 13C, whereas delta 18O was influenced by O3 especially in Q. robur. This may reflect a reduction of gs with the concomitant reduction in photosynthetic capacity. However, the effect of elevated O3 on leaf gas exchange as indicated by the combined analysis of stable isotopes was much lower than that of water stress. Water stress was detectable by delta 13C and by delta 18O in all three oak species, while delta 15N did not define plant response to stress conditions in any species. The delta 13C signal was correlated to leaf water content (LWC) in Q. robur and Q. ilex, showing isohydric and anisohydric strategy, respectively, at increasing stress intensity (low value of LWC). No interactive effect of water stress and O3 exposure on the isotopic responses was found, suggesting no cross-protection on seasonal carbon assimilation independently on the species adaptation strategy.
Keywords:ozone, gas exchange, English oak, holm oak, downy oak, Quercus ilex L., Quercus robur L., Quercus pubescens Willd
Year of publishing:2020
COBISS_ID:24783363 Link is opened in a new window
UDC:630*18:630*23
ISSN on article:1999-4907
OceCobissID:3872166 Link is opened in a new window
DOI:10.3390/f11080864 Link is opened in a new window
Note:Nasl. iz nasl. zaslona; Opis vira z dne 10. 8. 2020; Avtorji iz Slovenije: Tanja Mrak, Saša Zavadlav, Tom Levanič, Hojka Kraigher;
Views:1144
Downloads:687
Files:URL URL - Presentation file, visit https://doi.org/10.3390/f11080864
.pdf PDF - Presentation file, download (2,70 MB)
 
Journal:Forests
MDPI
 
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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

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
Project no.:P4-0107
Name:Gozdna biologija, ekologija in tehnologija

Licences

License:CC BY 4.0, Creative Commons Attribution 4.0 International
Link:http://creativecommons.org/licenses/by/4.0/
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
Licensing start date:27.08.2020

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