2000: 92: 282-285
Molecular phylogeny of the arbuscular mycorrhizal
fungi Glomus sinuosum and Sclerocystis coremioides
Joseph B. Morton2 and
Thomas D. Bruns1
Department of Plant and Microbial Biology, 321 Koshland Hall,
University of California, Berkeley, California, 94720, USA
International Collectioon of Vesicular-Arbuscular and Arbuscular
Mycorrhizal Fungi, Division of Plant and Soil Sciences, 401 Brooks
Hall, P.O. Box 6057, West Virginia University, Morgantown,
West Virginia 26506
We report the first molecular analysis of
arbuscular mycorrhizal fungi previously classified in the genus
Sclerocystis. Fungi in Sclerocystis sensu lato were
distinguished by formation of complex sporocarps. Most species
were transferred to Glomus, but both their taxonomic and
phylogenetic relations remain the subject of controversy. Phylogenetic
analysis of the 18S ribosomal subunit of G. sinuosum (= S.
sinuosa) and S. coremioides shows that both species
are each other's closest relatives and fall within a monophyletic
clade comprising the well-characterized species, G. mosseae,
G. intraradices and G. vesiculiferum, to the exclusion
of several other Glomus species. This placement indicates
that formation of complex sporocarps is an advanced character
of some Glomus species, but the sporocarpic trait is not
sufficiently unique to group these species into a separate genus
Dataset and phylogenetic tree available at TREEBASE
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