Thomas Niklaus Sieber

Last Name

Sieber

First Name

Thomas Niklaus

ORCID

0000-0002-1591-9074

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Publications 1 - 10 of 119

Environmental changes and endophytes
Danti, Roberto; Sieber, Thomas Niklaus (2004)
Endophytism in forest trees
Venturia orni sp nov., a species distinct from Venturia fraxini, living in the leaves of Fraxinus ornus
Ibrahim, Mohammed; Schlegel, Markus; Sieber, Thomas Niklaus (2016)
Mycological Progress
Venturia fraxini Aderh. s.l. is an endophytic fungus in the leaves of different ash species like Fraxinus excelsior and F. ornus. This study shows that the Venturia species on F. ornus is not conspecific with V. fraxini s.s., but is a closely related species which is described as a new species: Venturia orni sp. nov. The two species distinctly differ morphologically and genetically. In contrast to V. fraxini, V. orni constantly lacks setae lining the ostiolum of the pseudothecia. In addition, the two species differ significantly and constantly in the sequences of the internal transcribed spacer (ITS) region and the genes coding for calmodulin, elongation factor EF-1α, and β-tubulin. Using the same molecular markers, another unknown endophytic Venturia species was discovered on F. ornus. However, this species never sporulated and, thus, a description of its morphology was not possible. Venturia fraxini and V. orni are host-specific and infect only F. excelsior and F. ornus, respectively, although the two hosts are sympatric at all examined sites. Venturia orni is abundant and exhibits high genetic and morphological variability, also in F. ornus planted as ornamentals outside its native range. This study indicates that Fraxinus spp. host an undiscovered wealth of fungal diversity.
Microsatellite-based quantification method to estimate biomass of endophytic Phialocephala species in strain mixtures
Reininger, Vanessa; Grünig, Christoph R.; Sieber, Thomas Niklaus (2011)
Microbial Ecology
Pyrenochaeta ligni-putridi sp.nov., a new coelomycete associated with butt rot of Picea abies in Switzerland
Sieber, Thomas Niklaus (1995)
Mycological Research
Ausbreitung von Schadorganismen im Wald unter Einfluss des Klimawandels
Könz, Gianna; Stöckli, Sibylle; Huber, Barbara; et al. (2022)
Schweizerische Zeitschrift für Forstwesen
Durch den globalen Handel und die erhöhte Mobilität dringen Schadorganismen wie Insekten, Pilze, Viren und Nematoden in neue Gebiete vor. Günstigere Klimabedingungen vereinfachen oft die Etablierung und Ausbreitung dieser Organismen, die invasiv werden können. Gewisse Insektenpopulationen reagieren schnell auf klimatische Änderungen: Wärmeres und trockeneres Wetter begünstigt Massenvermehrungen und ermöglicht die Besiedlung in bis anhin ungeeignete Gebiete, in denen Wirtspflanzen vorhanden sind. Zudem werden manche Baumarten aufgrund der klimawandelbedingten Zunahme von Trockenperioden anfälliger gegenüber Schaderregern. Neben invasiven, gebietsfremden Arten können auch bisher unauffällige, einheimische Arten problematisch werden. Die neuste Version der bioklimatischen Simulationssoftware CLIMEX berechnet das geografische Ausbreitungspotenzial von Schadorganismen mit hoch aufgelösten Klimadaten. So können Gefahrenquellen besser eingeschätzt und eine kostensparende Überwachung etabliert werden.
Endophytic mycobiota in bark of European beech (Fagus sylvatica) in the Apennines
Danti, R.; Sieber, Thomas Niklaus; Sanguineti, G. (2002)
Mycological Research
Genetic Variation among European Lophodermium piceae Populations
Müller, Michael M.; Sieber, Thomas Niklaus; Hantula, Jarkko (2007)
Acta silvatica & lignaria Hungarica
Competitiveness of endophytic Phialocephala fortinii s.l. – Acephala applanata strains in Norway spruce roots
Stroheker, Sophie; Dubach, Vivanne; Sieber, Thomas Niklaus (2018)
Fungal Biology
Genetic variability among strains of Phialocephala fortinii and phylogenetic analysis of the genus Phialocephala based on rDNA ITS sequence comparisons
Grünig, C.; Sieber, Thomas Niklaus; Rogers, S.; et al. (2002)
Canadian Journal of Botany
Biological control of Heterobasidion annosum with Phlebiopsis gigantea on Norway spruce in Switzerland
Holdenrieder, Ottmar; Engesser, Roland; Sieber, Thomas Niklaus (1998)
Les Colloques de l'INRA ~ Root and butt rot of forest trees

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Thomas Niklaus Sieber

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