Fungal Genetics and Biology
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
Mohamed Hijri, Hubert Dulieu and Ian R. Sanders
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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