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Articles containing the keyword 'Ophiostoma'

Category: Article

article id 5415, category Article
Kim von Weissenberg. (1990). Host-parasite relationships in forest ecosystems: A review. Silva Fennica vol. 24 no. 1 article id 5415. https://doi.org/10.14214/sf.a15567
Keywords: Pinus; resistance; Ophiostoma; rust diseases; Cronartium; Cryphonectria; Melampsora; polygenic; oligogenic; gene-for-gene
Abstract | View details | Full text in PDF | Author Info

Based on a survey of world literature it is concluded that 1) the better -researched epidemic forest pathosystems are caused by anthropogenic factors, 2) the systems most likely have a polygenic background, and 3) resistance breeding should maintain polygenic resistance with restrictive incorporation of oligogenic resistance. Corresponding objectives are valid in breeding programs of presently balanced pathosystems, which may turn epidemic if man causes changes in the gene pool and alters critical environmental conditions.

The PDF includes an abstract in English.

  • Weissenberg, E-mail: kw@mm.unknown (email)

Category: Research article

article id 1328, category Research article
Nelly N. Selochnik, Nataliya V. Pashenova, Evgeny Sidorov, Michael J. Wingfield, Riikka Linnakoski. (2015). Ophiostomatoid fungi and their roles in Quercus robur die-back in Tellermann forest, Russia. Silva Fennica vol. 49 no. 5 article id 1328. https://doi.org/10.14214/sf.1328
Keywords: Ophiostomatales; Ophiostoma; oak die-back; pathogenicity
Highlights: Dominant ophiostomatoid fungi associated with Q. robur in the post-outbreak region of oak die-back were investigated; Ophiostoma quercus was the most commonly encountered fungus; This is the first report of O. grandicarpum from Russia; The results of preliminary pathogenicity experiments demonstrate that fungi investigated in this study are unlikely to play causal role in oak die-back
Abstract | Full text in HTML | Full text in PDF | Author Info

Several eastern European countries have reported outbreaks of oak die-back during the 1980’s. Species of Ophiostoma Syd. were isolated from diseased trees and have been suggested to be the possible causal agents of the die-back, but this view have generally not been accepted. In order to monitor the post-outbreak region of oak die-back and to consider the possible role of Ophiostoma spp. in the syndrome, research has been conducted in the Tellerman forest, Voronezh region, Russia between 2005 and 2011. Our study resulted in the isolation of ophiostomatoid fungi from Quercus robur L. trees displaying external signs of desiccation. Fungi were identified based on morphological characteristics and DNA sequence comparisons. Three species of Ophiostoma were identified including O. grandicarpum (Kowalski & Butin) Rulamort, a species closely related to O. abietinum Marm. & Butin, O. fusiforme Aghayeva & M.J. Wingf. and O. lunatum Aghayeva & M.J. Wingf. representing a poorly understood species complex, and most commonly O. quercus (Georgev.) Nannf. Pathogenicity of these fungi was tested using artificial inoculations on Q. robur trees. The fungi were shown to be non-pathogenic and unlikely to play any role in oak die-back. These fungi are most likely only components in a complex of abiotic, biotic and anthropogenic factors that have contributed to a die-back of Quercus spp. in Russia.

  • Selochnik, Forest Science Institute of RAS, Uspenskoe 143030, Moscow Region, Russia E-mail: lenelse@yandex.ru
  • Pashenova, V.N. Sukachev Institute of Forest SB RAS, Krasnoyarsk 660036, Russia E-mail: pasnat@ksc.krasn.ru
  • Sidorov, Department of Forest Protection and Game Management, St. Petersburg State Forest Technical University, St. Petersburg 194021, Russia E-mail: sidorov_evgeny@mail.ru
  • Wingfield, Forestry and Agricultural Biotechnology Institute (FABI), University of Pretoria, 0002 Pretoria, South Africa E-mail: mike.wingfield@up.ac.za
  • Linnakoski, Forestry and Agricultural Biotechnology Institute (FABI), University of Pretoria, 0002 Pretoria, South Africa; Department of Forest Sciences, University of Helsinki, P.O. Box 27, FI-00014 University of Helsinki, Finland ORCID http://orcid.org/0000-0002-3294-8088 E-mail: riikka.linnakoski@helsinki.fi (email)
article id 137, category Research article
Alberto Bueno, Julio J. Diez, Mercedes M. Fernández. (2010). Ophiostomatoid fungi transported by Ips sexdentatus (Coleoptera; Scolytidae) in Pinus pinaster in NW Spain. Silva Fennica vol. 44 no. 3 article id 137. https://doi.org/10.14214/sf.137
Keywords: Spain; Ips sexdentatus; ophiostomatoid fungi; Pinus pinaster; mycangia
Abstract | View details | Full text in PDF | Author Info
Ips sexdentatus (Coleoptera; Scolytidae) is one of the main vectors of ophiostomatoid blue stain fungi that can cause mortality of healthy conifers. For this reason, our objective was to identify the fungal species carried by this bark beetle in Maritime pine (Pinus pinaster) in north-western Spain. We collected insects from naturally infected pines placed them on malt extract agar (MEA) and left to walk freely on culture plates. Plant tissues (phloem and xylem) from adult pines were cultivated in moist chambers and also on MEA. At the same time, we inoculated pine logs with living insects in the laboratory. Four ophiostomatoid fungi appeared: Ophiostoma ips, Ophiostoma brunneo-ciliatum, Ceratocystiopsis minuta and Ophiostoma sp., as well as Graphium and Sporothrix imperfect stages. Moreover there were seven saprophytic species: Penicillium sp., Trichoderma sp., Verticillium sp., Mucor sp., Aspergillus niger, Gliocladium viride and Scopulariopsis brevicaulis, and the pathogenic Ophiostoma ips. The fructification percentage of the ophiostomatoid species was low, however; its imperfect stage Sporothrix/Hyalorhinocladiella produced high quantity of conidiophores.
  • Bueno, University of Valladolid, Dept of Agroforestry Sciences, Palencia, Spain E-mail: ab@nn.es
  • Diez, University of Valladolid, Dept of Agroforestry Sciences, Palencia, Spain E-mail: jjd@nn.es
  • Fernández, University of Valladolid, Dept of Agroforestry Sciences, Palencia, Spain E-mail: mffernan@agro.uva.es (email)

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