Description: Das Projekt "Patterns of evolution in the species complex of the tree-root endophyte Phialocephala fortinii" wird vom Umweltbundesamt gefördert und von Eidgenössische Technische Hochschule Zürich, Professur für Forstschutz und Dendrologie durchgeführt. Populations of P. fortinii from allover Europe are examined using microsatellites to construct gene genealogies and infer evolutionary history. The tree-root endophyte Phialocephala fortinii s.l. (mitosporic Ascomycota) is the dominant colonizer of conifer root systems in forests in the northern hemisphere. P. fortinii s.l. is genetically highly diverse and forms a complex of several cryptic species. Recombination occurs or has occurred within cryptic species and to some extent also among them (introgression). Cryptic species occur sympatrically and they can form large thalli, but it remains unclear whether the observed patterns of spatial distribution reflect local climax situations or are the results of recent gene and genotype flow. One of the key objectives will be to estimate population genetic parameters (eg. migration rates, genotype flow, recombination) within and among populations of cryptic species in forests where man-mediated genotype flow can be excluded. Other key objectives are the determination of the number, frequency, distribution and evolutionary history of the cryptic species in Europe and to identify the driving forces for speciation. The approach will be multidisciplinary and will include standard mycological and microbiological methods as well as molecular genetic techniques such as microsatellite fingerprinting and DNA sequencing. The evolutionary history of haplotypes at both the population and species level will be reconstructed and the results will be compared with known patterns of pleistocenic glaciations and postglacial recolonization of host trees. The project will be a significant contribution to the understanding of the population and evolutionary genetics of a versatile and ecologically extremely successful fungal genus and it will shed light on the effects of pleistocenic and postglacial climatic changes on fungal speciation.
Types:
SupportProgram
Origin: /Bund/UBA/UFORDAT
Tags: Gen ? Nadelgehölz ? Introgression ? Zürich ? Waldschaden ? Fluss ? Dendrologie ? Genotyp ? Beleuchtung ? Baum ? Baumwurzel ? DNA ? Genetik ? Brunnen ? Europäische Gemeinschaften ? Waldboden ? Wiederansiedlung ? Wirkung ? Pflanzenwurzel ? Bodenbelastung ? Evolution ? Standardmethode ? Technik ? Waldschutz ? Wirkung ? Bevölkerungsmigration ? Europa ? Norm ? Bevölkerung ? Kenngröße ? Klimawandel ? Verfahren ? Wald ? Beitrag ? Methode ? gemischt ? microbiologisch ? neu ? nördlich ? sonstig ? vergleichen ? Bemessung ? Überreste ? ökologisch ? Projekt ? Sequenzierung ? Annäherung ? Speziation [Chemie] ? Ergebnis ? Fluss [Bewegung] ? Formblätter ? Genetischer Fingerabdruck ? Großer Wald ? Verteilung ? ein- ? evolutionär ? Art [Spezies] ? Klimax ? extrem ?
License: cc-by-nc-nd/4.0
Language: Deutsch
Time ranges: 2006-04-01 - 2024-11-29
Accessed 1 times.