Blackmeristematicfungicansurvivehighdosesofradiationandareresistanttodesiccation.Theseadaptationshelpthemtocolonizeharsholigotrophichabitats,e.g.,onthesurfaceandsubsurfaceofrocks.Oneoftheirmostcharacteristicstress-resistancemechanismsistheaccumulationofmelanininthecellwalls.This,productionofotherprotectivemoleculesandaplasticmorphologyfurthercontributetoecologicalflexibilityofblackfungi.Increasedgrowthratesofsomespeciesafterexposuretoionizingradiationevensuggestyetunknownmechanismsofenergyproduction.OtherunusualmetabolicstrategiesmayincludeharvestingUVorvisiblelightorgainingenergybyformingfacultativelichen-likeassociationswithalgaeorcyanobacteria.Thelatterisnotentirelysurprising,sincecertainblackfungallineagesarephylogeneticallyrelatedtocladesoflichen-formingfungi.Similartoblackfungi,lichen-formingfungiareadaptedtogrowthonexposedsurfaceswithlowavailabilityofnutrients.Theyalsoefficientlyuseprotectivemoleculestotoleratefrequentperiodsofextremestress.Traitssharedbybothgroupsoffungimayhavebeenimportantinfacilitatingtheevolutionandradiationoflichen-symbioses.

Polyextremotolerant black fungi: oligotrophism, adaptivepotential, and a link to lichen symbioses.

MUGGIA, LUCIA;
2012

Abstract

Blackmeristematicfungicansurvivehighdosesofradiationandareresistanttodesiccation.Theseadaptationshelpthemtocolonizeharsholigotrophichabitats,e.g.,onthesurfaceandsubsurfaceofrocks.Oneoftheirmostcharacteristicstress-resistancemechanismsistheaccumulationofmelanininthecellwalls.This,productionofotherprotectivemoleculesandaplasticmorphologyfurthercontributetoecologicalflexibilityofblackfungi.Increasedgrowthratesofsomespeciesafterexposuretoionizingradiationevensuggestyetunknownmechanismsofenergyproduction.OtherunusualmetabolicstrategiesmayincludeharvestingUVorvisiblelightorgainingenergybyformingfacultativelichen-likeassociationswithalgaeorcyanobacteria.Thelatterisnotentirelysurprising,sincecertainblackfungallineagesarephylogeneticallyrelatedtocladesoflichen-formingfungi.Similartoblackfungi,lichen-formingfungiareadaptedtogrowthonexposedsurfaceswithlowavailabilityofnutrients.Theyalsoefficientlyuseprotectivemoleculestotoleratefrequentperiodsofextremestress.Traitssharedbybothgroupsoffungimayhavebeenimportantinfacilitatingtheevolutionandradiationoflichen-symbioses.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11368/2735501
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