24 research outputs found
The Ophiostoma clavatum species complex: a newly defined group in the Ophiostomatales including three novel taxa
Two species of blue-stain fungi with similar morphologies, Ophiostoma brunneociliatum
and O. clavatum, are associates of bark beetles infesting Pinus spp. in Europe. This
has raised questions whether they represent distinct taxa. Absence of herbarium specimens and
contaminated or mistakenly identified cultures of O. brunneo-ciliatum and O. clavatum have
accentuated the uncertainty regarding their correct identification. The aim of this study was to
reconsider the identity of European isolates reported as O. brunneo-ciliatum and O. clavatum
by applying DNA-based identification methods, and to provide appropriate type specimens for
them. Phylogenetic analyses of the ITS, βT, TEF-1 and CAL gene sequences revealed that the
investigated isolates represent a complex of seven cryptic species. The study confirmed that
ITS data is insufficient to delineate species in some Ophiostoma species clusters. Lectotypes and epitypes were designated for O. clavatum and O. brunneo-ciliatum, and three new species,
O. brunneolum, O. macroclavatum and O. pseudocatenulatum, were described in the newly
defined O. clavatum-complex. The other two species included in the complex are O. ainoae
and O. tapionis. The results suggest co-evolution of these fungi in association with specific bark
beetles. The results also confirm the identity of the fungus associated with the pine bark beetle
Ips acuminatus as O. clavatum, while O. brunneo-ciliatum appears to be mainly associated with
another pine bark beetle, Ips sexdentatus.The University of Helsinki and the Emil Aaltonen Foundation, Finland; the University
of Pretoria, the members of the Tree Protection Co-operative Programme (TPCP) and the THRIP initiative of the
Department of Trade and Industry, South Africa; the Ministry of Science and Higher Education of the Republic of
Poland; Ministero dell’Istruzione, dell’Università e della Ricerca (PRIN 200774ENMR ‘Climatic change and
Italian pine pests: a model study’), Italy; the European Union’s Seventh Framework Programme FP7/2007–2013
(KBBE 2009-3) under grant agreement 245268 ISEFOR; and the Norwegian Biodiversity Information Centre (pnr.
70184233).http://link.springer.com/journal/104822017-05-31hb2016Microbiology and Plant Patholog
Multigene phylogenies of Ophiostomataceae associated with Monterey pine bark beetles in Spain reveal three new fungal species
Ophiostoma species, some of which cause
sapstain in timber and/or are mild pathogens, are
common fungal associates of bark beetles (Coleoptera:
Scolytinae). Three new Ophiostomataceae from
Spain are recognized in the present study based on
comparisons of sequence data for three gene regions
as well as morphological characteristics. The new taxa
are described as Ophiostoma nebulare sp. nov.,
Ophiostoma euskadiense sp. nov. and Graphilbum
crescericum sp. nov.National Research Foundation, members of the Tree Protection Co-operative Programme (TPCP), the Department of Education, Universities and Research of Basque Government, and the NRF/DST Center of Excellence in Tree Health Biotechnology (CTHB).http://www.mycologia.orghb201