Mycopathologia (2010) 169, 413-423

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Joha W. Grobbelaar, Z. Wilhelm de Beer, Paulette Bloomer, Michael J. Wingfield and Brenda D. Wingfield (2010)
Ophiostoma tsotsi sp. nov., a wound-infesting fungus of hardwood trees in Africa
Mycopathologia 169 (5), 413-423
Abstract: Polymorphic sequence-characterised marker assays from a recent diversity study on the Ascomycete fungus Ophiostoma quercus reported that some isolates from Africa were genetically distinct from O. quercus. In the present study, these African isolates were compared with authentic O. quercus isolates by evaluating morphological characters, growth in culture, mating compatibility and DNA sequence data. The isolates from Africa were morphologically similar to O. quercus, presenting Pesotum and Sporothrix synanamorphs in culture. Phylogenetic analyses of the ribosomal internal transcribed spacer regions 1 and 2, ß-tubulin and translation elongation factor 1-alpha gene regions confirmed that the African group represents a distinct species within the hardwood lineage of the O. piceae complex, closely related to O. ulmi and O. himal-ulmi. Mating studies between O. quercus and the African isolates showed that isolates mated predominantly with those of their own group, although there were rare cases of fertile crosses between the groups. Isolates residing in the African lineage are described here as a new species, O. tsotsi sp. nov.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Z. Wilhelm de Beer, Brenda D. Wingfield, Michael J. Wingfield

Research topic(s) for pests/diseases/weeds:
identification/taxonomy


Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.


Ophiostoma quercus
Ophiostoma tsotsi