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Stud Mycol 55(1): 255-267 2006
Copyright © 2006 CBS Fungal Biodiversity Centre
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Celoporthe dispersa gen. et sp. nov. from native Myrtales in South Africa

Grace Nakabonge1,*, Marieka Gryzenhout1, Jolanda Roux1, Brenda D. Wingfield2 and Michael J. Wingfield1

1 Department of Microbiology and Plant Pathology, Forestry and Agricultural Biotechnology Institute (FABI), University of Pretoria, Pretoria, 0002, South Africa
2 Department of Genetics, Forestry and Agricultural Biotechnology Institute (FABI), University of Pretoria, Pretoria, 0002, South Africa

* Correspondence: Grace Nakabonge, Grace.Nakabonge{at}fabi.up.ac.za

In a survey for Cryphonectria and Chrysoporthe species on Myrtales in South Africa, a fungus resembling the stem canker pathogen Chrysoporthe austroafricana was collected from native Syzygium cordatum near Tzaneen (Limpopo Province), Heteropyxis canescens near Lydenburg (Mpumalanga Province) and exotic Tibouchina granulosa in Durban (KwaZulu-Natal Province). The fungus was associated with dying branches and stems on S. cordatum, H. canescens and T. granulosa. However, morphological differences were detected between the unknown fungus from these three hosts and known species of Chrysoporthe. The aim of this study was to characterise the fungus using DNA sequence comparisons and morphological features. Pathogenicity tests were also conducted to assess its virulence on Eucalyptus (ZG 14 clones), H. natalensis and T. granulosa. Plants of H. canescens were not available for inoculation. Results showed distinct morphological differences between the unknown fungus and Chrysoporthe spp. Phylogenetic analysis showed that isolates reside in a clade separate from Chrysoporthe and other related genera. Celoporthe dispersa gen. et sp. nov. is, therefore, described to accommodate this fungus. Pathogenicity tests showed that C. dispersa is not pathogenic to H. natalensis, but that it is a potential pathogen of Eucalyptus and Tibouchina spp.

Taxonomic novelties: Celoporthe Nakab., Gryzenh., Jol. Roux & M.J. Wingf. gen. nov., Celoporthe dispersa Nakab., Gryzenh., Jol. Roux & M.J. Wingf. sp. nov.

Keywords Chrysoporthe / Heteropyxis / Holocryphia / Phylogeny / Syzygium / Tibouchina




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