Fungal Genetics and Biology
1999: 28:238-244

Phylogenetic analysis of a dataset of fungal 5.8S rDNA sequences shows that highly divergent copies of Internal Transcribed Spacers reported from Scutellospora castanea are of Ascomycete origin

Dirk Redecker1, Mohamed Hijri, Hubert Dulieu and Ian R. Sanders

1Department of Plant and Microbial Biology, 321 Koshland Hall, University of California, Berkeley, California, 94720, USA

Using a dataset comprising 5.8S rDNA sequences from a wide range of fungi, we show that some sequences reported recently from the arbuscular mycorrhizal (AM) fungus Scutellospora castanea most likely originate from Ascomycetes. Other ITS and 5.8S sequences which were previously reported are confirmed as being clearly of mycorrhizal origin and are variable within one isolate of S. castanea. However, these results mean that previous conclusions which were drawn regarding the heterokaryotic status of AM fungal spores remain unproven. We provide an enlarged 5.8S rDNA dataset that can be used to check ITS sequences for conflicts with well-established phylogenies of the organisms that they were obtained from.

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