FrequencyandintensityofheatwavesanddroughteventsareexpectedtoincreaseinEuropeduetoclimatechange.Europeanbeech(FagussylvaticaL.)isoneofthemostimportantnativetreespeciesinEurope.Beechpopulationsoriginatingthroughoutitsnativerangewereselectedforcommon-gardenexperimentswiththeaimtodeterminewhethertherearefunctionalvariationsindroughtstressresponsesamongdifferentpopulations.One-yearoldseedlingsfromfourtosevenbeechpopulationsweregrownanddrought-treatedinagreenhouse,replicatingtheexperimentattwocontrastingsites,inItaly(Mediterraneanmountains)andGermany(CentralEurope).Experimentalfindingsindicatedthat:(1)drought(waterstress)mainlyaffectedgasexchangedescribingacriticalthresholdofdroughtresponsebetween30and26%SWAforphotosyntheticrateandCi/Ca,respectively;(2)theCitoCaratioincreasedsubstantiallywithseverewaterstresssuggestingastableinstantaneouswateruseefficiencyandanefficientregulationcapacityofwaterbalanceachievedbyatightstomatalcontrol;(3)therewasadifferentresponsetowaterstressamongtheconsideredbeechpopulations,differentlycombiningtraits,althoughtherewasnotawell-definedvariabilityindroughttolerance.Acombinedanalysisoffunctionalandstructuraltraitsfordetectingstresssignalsinbeechseedlingsissuggestedtoassessplantperformanceunderlimitingmoistureconditionsand,consequently,toestimateevolutionarypotentialofbeechunderachangingenvironmentalscenario.
Variation in ecophysiological traits and drought tolerance of beech (Fagus sylvatica L.) seedlings from different populations / Cocozza Claudia; De Miguel Marina; Pšidová Eva; Ditmarová L’Ubica; Marino Stefano; Maiuro Lucia; Alvino Arturo; Czajkowski Tomasz; Bolte Andreas; Tognetti Roberto. - In: FRONTIERS IN PLANT SCIENCE. - ISSN 1664-462X. - ELETTRONICO. - 7:(2016), pp. 1-14. [10.3389/fpls.2016.00886]
Variation in ecophysiological traits and drought tolerance of beech (Fagus sylvatica L.) seedlings from different populations
Cocozza Claudia
;
2016
Abstract
FrequencyandintensityofheatwavesanddroughteventsareexpectedtoincreaseinEuropeduetoclimatechange.Europeanbeech(FagussylvaticaL.)isoneofthemostimportantnativetreespeciesinEurope.Beechpopulationsoriginatingthroughoutitsnativerangewereselectedforcommon-gardenexperimentswiththeaimtodeterminewhethertherearefunctionalvariationsindroughtstressresponsesamongdifferentpopulations.One-yearoldseedlingsfromfourtosevenbeechpopulationsweregrownanddrought-treatedinagreenhouse,replicatingtheexperimentattwocontrastingsites,inItaly(Mediterraneanmountains)andGermany(CentralEurope).Experimentalfindingsindicatedthat:(1)drought(waterstress)mainlyaffectedgasexchangedescribingacriticalthresholdofdroughtresponsebetween30and26%SWAforphotosyntheticrateandCi/Ca,respectively;(2)theCitoCaratioincreasedsubstantiallywithseverewaterstresssuggestingastableinstantaneouswateruseefficiencyandanefficientregulationcapacityofwaterbalanceachievedbyatightstomatalcontrol;(3)therewasadifferentresponsetowaterstressamongtheconsideredbeechpopulations,differentlycombiningtraits,althoughtherewasnotawell-definedvariabilityindroughttolerance.Acombinedanalysisoffunctionalandstructuraltraitsfordetectingstresssignalsinbeechseedlingsissuggestedtoassessplantperformanceunderlimitingmoistureconditionsand,consequently,toestimateevolutionarypotentialofbeechunderachangingenvironmentalscenario.
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