World's Best Scientists 2026 revealed!
Thomas N. Sieber

Thomas N. Sieber

D-Index & Metrics

Plant Science and Agronomy

D-Index
50
Citations
7947
World Ranking
2180
National Ranking
43

Overview

What is he best known for?

The fields of study he is best known for:

  • Botany
  • Ecology
  • Fungus

Thomas N. Sieber mainly focuses on Botany, Plant use of endophytic fungi in defense, Ecology, Species complex and Endophyte. His study in Taxon, Taxonomy, Hymenoscyphus, Fraxinus angustifolia and Fraxinus falls within the category of Botany. His research in Plant use of endophytic fungi in defense intersects with topics in Picea abies, Abies alba, Colonization, Fusarium and Fungi imperfecti.

His research integrates issues of Acephala applanata and Population biology in his study of Ecology. The study incorporates disciplines such as Genetic variation, Ericaceae, Virulence and Reproductive isolation in addition to Species complex. His studies in Endophyte integrate themes in fields like Curvularia, Chaetomium globosum, Colletotrichum crassipes, Horticulture and Botryosphaeria rhodina.

His most cited work include:

  • Ecology, metabolite production, and substrate utilization in endophytic fungi. (343 citations)
  • Endophytic fungi in forest trees: are they mutualists? (327 citations)
  • Microbial root endophytes (297 citations)

What are the main themes of his work throughout his whole career to date?

Thomas N. Sieber focuses on Botany, Endophyte, Plant use of endophytic fungi in defense, Species complex and Picea abies. His studies deal with areas such as Host and Colonization as well as Botany. His work in Endophyte covers topics such as Beech which are related to areas like Discula.

His Plant use of endophytic fungi in defense research incorporates themes from Cenangium ferruginosum, Twig, Hymenoscyphus fraxineus, Phomopsis and Mycelium. His Species complex research includes elements of Genetic analysis, Inoculation and Gene flow. His study in Picea abies is interdisciplinary in nature, drawing from both Zoology and Conidium.

He most often published in these fields:

  • Botany (83.65%)
  • Endophyte (34.62%)
  • Plant use of endophytic fungi in defense (25.96%)

What were the highlights of his more recent work (between 2012-2021)?

  • Botany (83.65%)
  • Endophyte (34.62%)
  • Plant use of endophytic fungi in defense (25.96%)

In recent papers he was focusing on the following fields of study:

The scientist’s investigation covers issues in Botany, Endophyte, Plant use of endophytic fungi in defense, Species complex and Hymenoscyphus fraxineus. His Botany research incorporates elements of Ascomycota, Host and Colonization. His work deals with themes such as Zoology and Blight, which intersect with Endophyte.

His Plant use of endophytic fungi in defense research is multidisciplinary, relying on both Coniothyrium, Nigrospora, Ascochyta, Alternaria and Dutch elm disease. Thomas N. Sieber combines subjects such as Inoculation, Picea abies, Tectona, Diaporthe and Community structure with his study of Species complex. Thomas N. Sieber interconnects Ascospore, Ascocarp, Fraxinus ornus and Venturia in the investigation of issues within Hymenoscyphus fraxineus.

Between 2012 and 2021, his most popular works were:

  • Hymenoscyphus pseudoalbidus, the causal agent of European ash dieback (196 citations)
  • Fungal Root Endophytes (121 citations)
  • Resistance to Dutch elm disease reduces presence of xylem endophytic fungi in Elms (Ulmus spp.). (51 citations)

In his most recent research, the most cited papers focused on:

  • Botany
  • Ecology
  • Fungus

Thomas N. Sieber mainly focuses on Botany, Plant use of endophytic fungi in defense, Endophyte, Hymenoscyphus fraxineus and Fraxinus. As part of his studies on Botany, Thomas N. Sieber frequently links adjacent subjects like Species complex. His research integrates issues of Fraxinus pennsylvanica, Range, Inoculation, Invasive species and Virulence in his study of Species complex.

His work deals with themes such as Animal ecology, Host, Ophiostoma and Microbiology, which intersect with Plant use of endophytic fungi in defense. His work carried out in the field of Endophyte brings together such families of science as Ascospore, Fraxinus ornus and Venturia. His research in Hymenoscyphus fraxineus intersects with topics in Ascocarp, Fraxinus angustifolia, Helotiales and Hymenoscyphus.

Best Publications

  • Endophytic fungi in forest trees: are they mutualists?

    Thomas N. Sieber

  • Ecology, metabolite production, and substrate utilization in endophytic fungi.

    Orlando Petrini;Thomas N. Sieber;Luigi Toti;Olivier Viret

  • Microbial root endophytes

    Barbara J. E. Schulz;Christine J. C. Boyle;Thomas N. Sieber

  • Hymenoscyphus pseudoalbidus, the causal agent of European ash dieback

    Andrin Gross;Ottmar Holdenrieder;Marco Pautasso;Valentin Queloz

  • Cryptic speciation in Hymenoscyphus albidus

    Valentin Queloz;Christoph Rudolf Grünig;Reinhard Berndt;T. Kowalski

  • Fungal Root Endophytes

    Thomas N. Sieber

  • Dark septate endophytes (DSE) of the Phialocephala fortinii s.l. – Acephala applanata species complex in tree roots: classification, population biology, and ecology

    Christoph R. GrünigC.R. Grünig;Valentin QuelozV. Queloz;Thomas N. SieberT.N. Sieber;Ottmar HoldenriederO. Holdenrieder

  • The profusion of dark septate endophytic fungi in non-ectomycorrhizal fine roots of forest trees and shrubs

    Karin Ahlich;Thomas N. Sieber

  • Season and Tissue Type Affect Fungal Endophyte Communities of the Indian Medicinal Plant Tinospora cordifolia More Strongly than Geographic Location

    Ashish Mishra;Surendra K. Gond;Anuj Kumar;Vijay K. Sharma

  • Endophytic Fungi in Four Winter Wheat Cultivars (Triticum aestivum L.) Differing in Resistance Against Stagonospora nodorum (Berk.) Cast. & Germ. =Septoria nodorum (Berk.) Berk.

    T. Sieber;T. K. Riesen;E. Müller;P. M. Fried

  • Endophytic fungi in twigs of healthy and diseased Norway spruce and white fir

    Thomas N. Sieber

  • Fragmented environment affects birch leaf endophytes

    M. Helander;J. Ahlholm;T. N. Sieber;S. Hinneri

  • Assemblages of endophytic fungi in coppice shoots of Castanea sativa

    Martin Bissegger;Thomas N. Sieber

  • Simulated acid rain affects birch leaf endophyte populations.

    M. Helander;S. Neuvonen;Thomas Niklaus Sieber;O. Petrini

  • Nutritional niche overlap potentiates the use of endophytes in biocontrol of a tree disease

    Kathrin Blumenstein;Benedicte R. Albrectsen;Benedicte R. Albrectsen;Juan A. Martín;Malin Hultberg

  • Negative effects on survival and performance of Norway spruce seedlings colonized by dark septate root endophytes are primarily isolate-dependent

    Christoph Tellenbach;Christoph Tellenbach;Christoph R. Grünig;Thomas N. Sieber

  • ENDOPHYTIC FUNGI IN SCOTS PINE NEEDLES : SPATIAL VARIATION AND CONSEQUENCES OF SIMULATED ACID RAIN

    M. L. Helander;T. N. Sieber;O. Petrini;S. Neuvonen

  • ENDOPHYTIC FUNGI OF RED ALDER (ALNUS RUBRA) LEAVES AND TWIGS IN BRITISH COLUMBIA

    T. N. Sieber;F. Sieber-Canavesi;C. E. Dorworth

  • No biogeographical pattern for a root-associated fungal species complex

    Valentin Queloz;Thomas N. Sieber;Ottmar Holdenrieder;Bruce A. McDonald

  • Fungal associations of serially washed healthy non-mycorrhizal roots of Picea abies

    O. Holdenrieder;Thomas Niklaus Sieber

  • Evidence for subdivision of the root-endophyte Phialocephala fortinii into cryptic species and recombination within species.

    Christoph R. Grünig;Bruce A. McDonald;Thomas N. Sieber;Scott O. Rogers

  • Effects of Salinity on Root Growth

    Amram Eshel;Tom Beeckman

Frequent Co-Authors

Orlando Petrini
Orlando Petrini University of Applied Sciences and Arts of Southern Switzerland
Marco Conedera
Marco Conedera Swiss Federal Institute for Forest, Snow and Landscape Research
Marjo Helander
Marjo Helander University of Turku
Jarkko Hantula
Jarkko Hantula Natural Resources Institute Finland
Kari Saikkonen
Kari Saikkonen University of Turku
Seppo Neuvonen
Seppo Neuvonen Natural Resources Institute Finland
Harald Bugmann
Harald Bugmann ETH Zurich
Daniel Rigling
Daniel Rigling Swiss Federal Institute for Forest, Snow and Landscape Research

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