Effectsofthephytotoxicandwidespreadozone(O3)pollutionmaybespeciesspecific,butknowledgeonMediterraneanconiferresponsestolong-termrealisticexposureisstilllimited.Weexaminedresponsesregardingtophotosynthesis,needlebiochemicalstressmarkersandcarbonandnitrogen(N)isotopesoftwoMediterraneanpinespecies(PinushalepensisMill.andPinuspineaL.).SeedlingsweregrowninaFree-AirControlledExposureexperimentwiththreelevelsofO3(ambientair,AA[38.7p.p.b.asdailyaverage];1.5×AAand2.0×AA)duringthegrowingseason(May–October2019).InP.halepensis,O3causedasignificantdecreaseinthephotosyntheticrate,whichwasmainlyduetoareductionofbothstomatalandmesophylldiffusionconductancetoCO2.IsotopicanalysesindicatedacumulativeormemoryeffectofO3exposureonthisspecies,asthenegativeeffectswerehighlightedonlyinthelategrowingseasoninassociationwithareducedbiochemicaldefensecapacity.Ontheotherhand,therewasnocleareffectofO3onphotosynthesisinP.pinea.However,thisspeciesshowedenhancedNallocationtoleavestocompensateforreducedphotosyntheticN-useefficiency.WeconcludethatfunctionalresponsestoO3aredifferentbetweenthetwospeciesdeterminingthatP.halepensiswiththinneedleswasrelativelysensitivetoO3,whileP.pineawiththickerneedleswasmoreresistantduetoapotentiallylowO3loadperunitmassofmesophyllcells,whichmayaffectspecies-specificresilienceinO3-pollutedMediterraneanpineforests.

Functional responses of two Mediterranean pine species in an ozone Free-Air Controlled Exposure (FACE) experiment

Lorenzo Cotrozzi
Secondo
;
Cristina Nali;Elisa Pellegrini;Andrea Scartazza;
2023-01-01

Abstract

Effectsofthephytotoxicandwidespreadozone(O3)pollutionmaybespeciesspecific,butknowledgeonMediterraneanconiferresponsestolong-termrealisticexposureisstilllimited.Weexaminedresponsesregardingtophotosynthesis,needlebiochemicalstressmarkersandcarbonandnitrogen(N)isotopesoftwoMediterraneanpinespecies(PinushalepensisMill.andPinuspineaL.).SeedlingsweregrowninaFree-AirControlledExposureexperimentwiththreelevelsofO3(ambientair,AA[38.7p.p.b.asdailyaverage];1.5×AAand2.0×AA)duringthegrowingseason(May–October2019).InP.halepensis,O3causedasignificantdecreaseinthephotosyntheticrate,whichwasmainlyduetoareductionofbothstomatalandmesophylldiffusionconductancetoCO2.IsotopicanalysesindicatedacumulativeormemoryeffectofO3exposureonthisspecies,asthenegativeeffectswerehighlightedonlyinthelategrowingseasoninassociationwithareducedbiochemicaldefensecapacity.Ontheotherhand,therewasnocleareffectofO3onphotosynthesisinP.pinea.However,thisspeciesshowedenhancedNallocationtoleavestocompensateforreducedphotosyntheticN-useefficiency.WeconcludethatfunctionalresponsestoO3aredifferentbetweenthetwospeciesdeterminingthatP.halepensiswiththinneedleswasrelativelysensitivetoO3,whileP.pineawiththickerneedleswasmoreresistantduetoapotentiallylowO3loadperunitmassofmesophyllcells,whichmayaffectspecies-specificresilienceinO3-pollutedMediterraneanpineforests.
2023
Hoshika, Yasutomo; Cotrozzi, Lorenzo; Gavrichkova, Olga; Nali, Cristina; Pellegrini, Elisa; Scartazza, Andrea; Paoletti, Elena
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/1198988
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