12 pages
English

Some Mediterranean plant species Lavandula spp and Thymus satureioides act as potential ‘plant nurses' for the early growth of Cupressus atlantica

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Niveau: Supérieur, Doctorat, Bac+8
Some Mediterranean plant species (Lavandula spp. and Thymus satureioides) act as potential ‘plant nurses' for the early growth of Cupressus atlantica L. Ouahmane1,2, R. Duponnois3, M. Hafidi1, M. Kisa3, A. Boumezouch1, J. Thioulouse4 and C. Plenchette5,* 1Faculte des Sciences Semlalia, Universite Cadi Ayyad, Marrakech, Maroc; 2Direction Regionale des Eaux et Forets du Haut Atlas, Marrakech, Maroc; 3IRD, UMR 113 CIRAD/INRA/IRD/AGRO-M/UM2, Laboratoire des Symbioses Tropicales et Mediterraneennes (LSTM), Montpellier Cedex, France; 4CNRS, UMR 5558, Laboratoire de Biometrie et Biologie Evolutive, Universite Lyon 1, Lyon Cedex, France; 5INRA, UMR BGA, Dijon, France; *Author for correspondence (e-mail: ; phone: +03-80-69-30-32; fax: +03-80-69-32-62) Received 12 September 2005; accepted in revised form 8 December 2005 Key words: Arbuscular mycorrhiza, Cupressus atlantica, Degraded forest ecosystems, Microbial catabolic diversity, Nurse plant, Restoration ecology, Revegetation strategies Abstract The mycorrhizal status of several representative shrub species (Lavandula spp. and Thymus satureioides) in Moroccan semiarid ecosystems, was evaluated as well as their contribution to the mycorrhizal potential of the soil. Furthermore, the rhizosphere soils collected under these target species were tested for their influence on the growth of Cupressus atlantica, a tree species whose natural stands has declined in this area.

  • atlantica

  • group

  • soil

  • cupressus atlantica

  • discrimi- nant analysis

  • di?erent between

  • quinic acid

  • plant species


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Nombre de lectures 49
Langue English
PlantEcology(2006)DOI10.1007/s11258-005-9089-9Springer2006SomeMediterraneanplantspecies(Lavandulaspp.andThymussatureioides)actaspotential‘plantnurses’fortheearlygrowthofCupressusatlantica1,23131L.Ouahmane,R.Duponnois,M.Hafidi,M.Kisa,A.Boumezouch,J.Thioulouse4andC.Plenchette5,*1Faculte´desSciencesSemlalia,Universite´CadiAyyad,Marrakech,Maroc;2DirectionRe´gionaledesEauxetForeˆtsduHautAtlas,Marrakech,Maroc;3IRD,UMR113CIRAD/INRA/IRD/AGRO-M/UM2,LaboratoiredesSymbiosesTropicalesetMe´diterrane´ennes(LSTM),MontpellierCedex,France;4CNRS,UMR5558,LaboratoiredeBiome´trieetBiologieEvolutive,Universite´Lyon1,LyonCedex,France;5INRA,UMRBGA,Dijon,France;*Authorforcorrespondence(e-mail:christian.plenchette@dijon.inra.fr;phone:+03-80-69-30-32;fax:+03-80-69-32-62)Received12September2005;acceptedinrevisedform8December2005Keywords:Arbuscularmycorrhiza,Cupressusatlantica,Degradedforestecosystems,Microbialcatabolicdiversity,Nurseplant,Restorationecology,RevegetationstrategiesAbstractThemycorrhizalstatusofseveralrepresentativeshrubspecies(Lavandulaspp.andThymussatureioides)inMoroccansemiaridecosystems,wasevaluatedaswellastheircontributiontothemycorrhizalpotentialofthesoil.Furthermore,therhizospheresoilscollectedunderthesetargetspeciesweretestedfortheirinfluenceonthegrowthofCupressusatlantica,atreespecieswhosenaturalstandshasdeclinedinthisarea.SoilsampleswerecollectedfromtherhizosphereofL.stoechas,L.dentataandofC.atlanticaexistingintheexperimentalarea.Controlsampleswererandomlycollectedfrombaresoilsites,awayfromplantinflu-ence.AllthetargetspeciesformedAMsymbiosisandtheextentofAMfungalcolonizationwasnotsignificantlydifferentbetweenplantspecies.NosignificantdifferencewasdetectedbetweenthetotalnumberofAMfungalsporesofthebaresoilandthoserecordedintherootzonesoftargetspeciesandC.atlantica.ThreegeneraofAMfungi(Scutellospora,GlomusandAcaulospora)werepresentintherhizospheresoftheplantspeciesandinthebaresoil.Thenumberofmycorrhizalpropagulesinsoilorig-inatingfromaroundthefourtargetplantspecieswassignificantlyhigherthantheoneinthebaresoil(Figure1).Themostprobablenumber(MPN)ofmycorrhizalpropagulesper100gofdrysoilrangedfrom7.82(baresoil)to179.7(L.dentataandC.atlantica)and244.5(L.stoechasandT.satureioides).Asthetotalnumberofsporeswasnotdifferentforthesoilofdifferentorigins,theincreaseofthemycorrhizalsoilinfectivity(MSI)mainlyresultedfromlargerAMmycelialnetworksthatconstitutedthemainsourceofAMfungalinoculum.Inaddition,thisMSIenhancementwaslinkedwithchangesinthefunctioningofsoilmicrobialcommunities.Inaglasshouseexperiment,thegrowthofC.atlanticaseedlingswassignificantlyhigherintheC.atlanticaandintheshrubspeciessoilsthaninthebaresoil.AlthoughtheAMinoculumpotentialisnotsufficienttoensurethedevelopmentofforesttreesinMediterraneanecosystems,theuseofplantnursessuchasT.satureioidesorLavandulaspp.couldbeofgreatinteresttorestoreaself-sustainingvegetationcovertoactagainstdesertification.