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

Thomas N. Sieber publication distribution in Plant Science and Agronomy in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Plant Science and Agronomy in 2026. The highlighted bar marks where Thomas N. Sieber sits on this spectrum.

36–40 publications: 2 scientists 41–45 publications: 7 scientists 46–50 publications: 40 scientists 51–55 publications: 58 scientists 56–60 publications: 60 scientists 61–65 publications: 107 scientists 66–70 publications: 130 scientists 71–75 publications: 153 scientists 76–80 publications: 191 scientists 81–85 publications: 199 scientists 86–90 publications: 206 scientists 91–95 publications: 218 scientists 96–100 publications: 226 scientists 101–105 publications: 227 scientists 106–110 publications: 247 scientists 111–115 publications: 255 scientists 116–120 publications: 253 scientists 121–125 publications: 233 scientists 126–130 publications: 219 scientists 131–135 publications: 201 scientists 136–140 publications: 194 scientists 141–145 publications: 176 scientists 146–150 publications: 157 scientists 151–155 publications: 147 scientists 156–160 publications: 151 scientists 161–165 publications: 159 scientists 166–170 publications: 137 scientists 171–175 publications: 128 scientists 176–180 publications: 126 scientists 181–185 publications: 98 scientists 186–190 publications: 114 scientists 191–195 publications: 100 scientists 196–200 publications: 90 scientists 201–205 publications: 71 scientists 206–210 publications: 98 scientists 211–215 publications: 70 scientists 216–220 publications: 86 scientists 221–225 publications: 61 scientists 226–230 publications: 58 scientists 231–235 publications: 53 scientists 236–240 publications: 64 scientists 241–245 publications: 39 scientists 246–250 publications: 46 scientists 251–255 publications: 51 scientists 256–260 publications: 36 scientists 261–265 publications: 44 scientists 266–270 publications: 35 scientists 271–275 publications: 30 scientists 276–280 publications: 33 scientists 281–285 publications: 35 scientists 286–290 publications: 36 scientists 291–295 publications: 26 scientists 296–300 publications: 26 scientists 301–305 publications: 31 scientists 306–310 publications: 30 scientists 311–315 publications: 21 scientists 316–320 publications: 29 scientists 321–325 publications: 14 scientists 326–330 publications: 15 scientists 331–335 publications: 15 scientists 336–340 publications: 17 scientists 341–345 publications: 15 scientists 346–350 publications: 12 scientists 351–355 publications: 17 scientists 356–360 publications: 18 scientists 361–365 publications: 12 scientists 366–370 publications: 11 scientists 371–375 publications: 6 scientists 376–380 publications: 6 scientists 381–385 publications: 11 scientists 386–390 publications: 9 scientists 391–395 publications: 10 scientists 396–400 publications: 8 scientists 401–405 publications: 4 scientists 406–410 publications: 9 scientists 411–415 publications: 11 scientists 416–420 publications: 4 scientists 421–425 publications: 7 scientists 426–430 publications: 4 scientists 431–435 publications: 3 scientists 436–440 publications: 5 scientists 441–445 publications: 8 scientists 446–450 publications: 6 scientists 451–455 publications: 7 scientists 456–460 publications: 5 scientists 461–465 publications: 6 scientists 466 publications: 2 scientists 467+ publications: 99 scientists
36 publications 467+

This scientist: 116 publications — 37th percentile

37% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 467 publications or more.

Thomas N. Sieber D-index placement in Plant Science and Agronomy in 2026

The chart shows the D-index (discipline H-index) distribution of Plant Science and Agronomy scientists ranked by Research.com in 2026. The highlighted bar marks where Thomas N. Sieber sits on this spectrum.

30 D-Index: 200 scientists 31 D-Index: 236 scientists 32 D-Index: 253 scientists 33 D-Index: 283 scientists 34 D-Index: 288 scientists 35 D-Index: 240 scientists 36 D-Index: 246 scientists 37 D-Index: 243 scientists 38 D-Index: 247 scientists 39 D-Index: 229 scientists 40 D-Index: 232 scientists 41 D-Index: 230 scientists 42 D-Index: 228 scientists 43 D-Index: 219 scientists 44 D-Index: 193 scientists 45 D-Index: 164 scientists 46 D-Index: 158 scientists 47 D-Index: 143 scientists 48 D-Index: 131 scientists 49 D-Index: 127 scientists 50 D-Index: 122 scientists 51 D-Index: 122 scientists 52 D-Index: 110 scientists 53 D-Index: 102 scientists 54 D-Index: 98 scientists 55 D-Index: 79 scientists 56 D-Index: 85 scientists 57 D-Index: 88 scientists 58 D-Index: 91 scientists 59 D-Index: 62 scientists 60 D-Index: 61 scientists 61 D-Index: 59 scientists 62 D-Index: 54 scientists 63 D-Index: 61 scientists 64 D-Index: 59 scientists 65 D-Index: 58 scientists 66 D-Index: 41 scientists 67 D-Index: 49 scientists 68 D-Index: 39 scientists 69 D-Index: 32 scientists 70 D-Index: 40 scientists 71 D-Index: 47 scientists 72 D-Index: 38 scientists 73 D-Index: 28 scientists 74 D-Index: 29 scientists 75 D-Index: 28 scientists 76 D-Index: 22 scientists 77 D-Index: 21 scientists 78 D-Index: 25 scientists 79 D-Index: 26 scientists 80 D-Index: 19 scientists 81 D-Index: 16 scientists 82 D-Index: 12 scientists 83 D-Index: 16 scientists 84 D-Index: 14 scientists 85 D-Index: 11 scientists 86 D-Index: 17 scientists 87 D-Index: 13 scientists 88 D-Index: 10 scientists 89 D-Index: 12 scientists 90 D-Index: 18 scientists 91 D-Index: 16 scientists 92 D-Index: 16 scientists 93 D-Index: 17 scientists 94 D-Index: 12 scientists 95 D-Index: 8 scientists 96 D-Index: 9 scientists 97 D-Index: 9 scientists 98 D-Index: 11 scientists 99 D-Index: 12 scientists 100 D-Index: 5 scientists 101 D-Index: 8 scientists 102 D-Index: 4 scientists 103 D-Index: 11 scientists 104 D-Index: 5 scientists 105 D-Index: 9 scientists 106 D-Index: 7 scientists 107 D-Index: 4 scientists 108 D-Index: 8 scientists 109+ D-Index: 99 scientists
30 D-Index 109+

This scientist: 50 D-Index — 68th percentile

68% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 109 D-Index or more.

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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