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Faculty of Arts and HumanitiesDean's Office, Faculty of Arts and HumanitiesJakobi 2, r 116-121 51005 Tartu linn, Tartu linn, Tartumaa EST0Institute of History and ArchaeologyJakobi 2 51005 Tartu linn, Tartu linn, Tartumaa EST0Institute of Estonian and General LinguisticsJakobi 2, IV korrus 51005 Tartu linn, Tartu linn, Tartumaa ESTInstitute of Philosophy and SemioticsJakobi 2, III korrus, ruumid 302-337 51005 Tartu linn, Tartu linn, Tartumaa EST0Institute of Cultural ResearchÜlikooli 16 51003 Tartu linn, Tartu linn, Tartumaa EST0Institute of Foreign Languages and CulturesLossi 3 51003 Tartu linn, Tartu linn, Tartumaa EST0School of Theology and Religious StudiesÜlikooli 18 50090 Tartu linn, Tartu linn, Tartumaa EST0Viljandi Culture AcademyPosti 1 71004 Viljandi linn, Viljandimaa EST0Professors emeritus, Faculty of Arts and Humanities0Associate Professors emeritus, Faculty of Arts and Humanities0Faculty of Social SciencesDean's Office, Faculty of Social SciencesLossi 36 51003 Tartu linn, Tartu linn, Tartumaa EST0Institute of EducationJakobi 5 51005 Tartu linn, Tartu linn, Tartumaa EST0Johan Skytte Institute of Political StudiesLossi 36, ruum 301 51003 Tartu linn, Tartu linn, Tartumaa EST0School of Economics and Business AdministrationNarva mnt 18 51009 Tartu linn, Tartu linn, Tartumaa EST0Institute of PsychologyNäituse 2 50409 Tartu linn, Tartu linn, Tartumaa EST0School of LawNäituse 20 - 324 50409 Tartu linn, Tartu linn, Tartumaa EST0Institute of Social StudiesLossi 36 51003 Tartu linn, Tartu linn, Tartumaa EST0Narva CollegeRaekoja plats 2 20307 Narva linn, Ida-Virumaa EST0Pärnu CollegeRingi 35 80012 Pärnu linn, Pärnu linn, Pärnumaa EST0Professors emeritus, Faculty of Social Sciences0associate Professors emeritus, Faculty of Social Sciences0Faculty of MedicineDean's Office, Faculty of MedicineRavila 19 50411 Tartu linn, Tartu linn, Tartumaa ESTInstitute of Biomedicine and Translational MedicineBiomeedikum, Ravila 19 50411 Tartu linn, Tartu linn, Tartumaa ESTInstitute of PharmacyNooruse 1 50411 Tartu linn, Tartu linn, Tartumaa ESTInstitute of DentistryL. Puusepa 1a 50406 Tartu linn, Tartu linn, Tartumaa ESTInstitute of Clinical MedicineL. Puusepa 8 50406 Tartu linn, Tartu linn, Tartumaa ESTInstitute of Family Medicine and Public HealthRavila 19 50411 Tartu linn, Tartu linn, Tartumaa ESTInstitute of Sport Sciences and PhysiotherapyUjula 4 51008 Tartu linn, Tartu linn, Tartumaa ESTprofessors emeritus, Faculty of Medicine0associate Professors emeritus, Faculty of Medicine0Faculty of Science and TechnologyDean's Office, Faculty of Science and TechnologyVanemuise 46 - 208 51003 Tartu linn, Tartu linn, Tartumaa ESTInstitute of Computer ScienceNarva mnt 18 51009 Tartu linn, Tartu linn, Tartumaa ESTInstitute of GenomicsRiia 23b/2 51010 Tartu linn, Tartu linn, Tartumaa ESTEstonian Marine Institute0Institute of PhysicsInstitute of ChemistryRavila 14a 50411 Tartu linn, Tartu linn, Tartumaa ESTInstitute of Mathematics and StatisticsNarva mnt 18 51009 Tartu linn, Tartu linn, Tartumaa EST0Institute of Molecular and Cell BiologyRiia 23, 23b - 134 51010 Tartu linn, Tartu linn, Tartumaa ESTTartu ObservatoryObservatooriumi 1 61602 Tõravere alevik, Nõo vald, Tartumaa EST0Institute of TechnologyNooruse 1 50411 Tartu linn, Tartu linn, Tartumaa ESTInstitute of Ecology and Earth SciencesJ. Liivi tn 2 50409 Tartu linn, Tartu linn, Tartumaa ESTprofessors emeritus, Faculty of Science and Technology0associate Professors emeritus, Faculty of Science and Technology0Area of Academic SecretaryHuman Resources OfficeÜlikooli 18, ruumid 302 ja 304 50090 Tartu linn, Tartu linn, Tartumaa EST0Area of Head of FinanceFinance Office0Area of Director of AdministrationInformation Technology Office0Administrative OfficeÜlikooli 17 (III korrus) 51005 Tartu linn, Tartu linn, Tartumaa EST0Estates Office0Marketing and Communication OfficeÜlikooli 18, ruumid 102, 104, 209, 210 50090 Tartu linn, Tartu linn, Tartumaa EST0Area of RectorRector's Strategy OfficeInternal Audit OfficeArea of Vice Rector for Academic AffairsOffice of Academic AffairsUniversity of Tartu Youth AcademyUppsala 10 51003 Tartu linn, Tartu linn, Tartumaa ESTStudent Union OfficeÜlikooli 18b 51005 Tartu linn, Tartu linn, Tartumaa EST0Centre for Learning and TeachingArea of Vice Rector for ResearchUniversity of Tartu LibraryW. Struve 1 50091 Tartu linn, Tartu linn, Tartumaa ESTGrant OfficeArea of Vice Rector for DevelopmentCentre for Entrepreneurship and InnovationNarva mnt 18 51009 Tartu linn, Tartu linn, Tartumaa EST0University of Tartu Natural History Museum and Botanical GardenVanemuise 46 51003 Tartu linn, Tartu linn, Tartumaa EST0International Cooperation and Protocol Office0University of Tartu MuseumLossi 25 51003 Tartu linn, Tartu linn, Tartumaa EST0
PhD defence JANE OJA 8 November at 9:15
Jane Oja „Temporal and spatial patterns of orchid mycorrhizal fungi in forest and grassland ecosystems“
On 8 November at 9:15 Jane Oja will defend her doctoral thesis „Temporal and spatial patterns of orchid mycorrhizal fungi in forest and grassland ecosystems“.
Supervisors:
Prof. Urmas Kõljalg, University of Tartu institute of ecology and earth sciences, University of Tartu
Prof. Tiiu Kull, Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences
Opponent:
Dr. Melissa K. McCormick, Smithsonian Environmental
Research Center, USA
Summary:
Orchids represent one of the largest plant families and display tight associations with pollinators and mycorrhizal fungi. Orchid mycorrhizal (OrM) symbiosis is unique anatomically, taxonomically as well as functionally. Mycorrhizal fungi play a vital role for the orchids during their germination by providing essential nutrients to the dust-like orchid seeds that are almost devoid of their own food reserves. Even after orchids have developed green leaves and start photosynthesizing, their roots remain colonized by mycorrhizal fungi. However, the abundance of fungal colonization as well as the fungal community composition presumably change in the roots of the mature orchids during the vegetation period. Typically, photosynthetic, autotrophic orchids associate with saprotrophic fungi from the Ceratobasidiaceae, Tulasnellaceae and Sebacinales. So far, the distribution and ecological requirements of these fungi remain poorly explored. The aim of this thesis was therefore to study the temporal and spatial patterns of orchid mycorrhizal fungi in forest and grassland ecosystems. The thesis was particularly focused on 1) how the community composition of the putative OrM fungal taxa changes over the vegetation period in relation to the developmental phases of the host orchid species, 2) how the community composition of the putative OrM fungal taxa varies across different habitats as well as within the same habitat and on 3) how the richness of putative OrM fungi changes with the increasing distance from the orchid patches and 4) whether the putative OrM fungi form spatial patterns along the distance from the orchid patches. In addition, we extended annotations of publicly available OrM fungal ITS sequences. The main results of the thesis can be summarized as follows: 1) the community composition of the OrM fungi in roots was primarily host dependent and only secondarily affected by habitat and even to a lesser degree by the developmental phase and 2) in semi-natural grasslands, OrM fungi were randomly distributed and showed little evidence of a distance-dependent decline away from the adult orchids. We detected a number of insufficiently annotated OrM fungal sequences deposited in public databases, as well as sequences which suffered from low read quality and/or chimeras.
Location: Lai 40-218, Tartu
URL: http://hdl.handle.net/10062/62318