Molecular Biology and Evolution, Vol 13, 462-470, Copyright © 1996 by Society for Molecular Biology and Evolution
ML Berbee
The fungal subclass Loculoascomycetes is characterized by asci or sexual
spore sacks with two separable wall layers. At maturity, the inner wall
layer protrudes out beyond the outer wall as in a jack-in- the-box. If the
Loculoascomycetes were monophyletic and their jack-in- the-box type asci
evolved once, then taxa from diverse loculoascomycete lineages would
cluster together in a DNA sequence-based tree. To evaluate the phylogenetic
history of the two-walled asci, I sequenced the 18S nuclear rRNA genes of
16 species from seven families in the loculoascomycete orders Pleosporales,
Dothideales, and Chaetothyriales. Within the Loculoascomycetes, the
Pleosporales form a monophyletic group in 99% of the bootstrapped parsimony
trees. The Dothideales usually appear as a monophyletic group but without
statistical support. Capronia pilosella (Herpotrichiellaceae, Order
Chaetothyriales) clusters with plectomycete members of the subclass
Euascomycetes rather than the other Loculoascomycetes in 99% of parsimony
and neighbor- joining bootstrap replicates. Although the
jack-in-the-box-type ascus is a good marker for large, monophyletic
loculoascomycete orders, it must have evolved at least twice or been lost
at least once.
ORIGINAL ARTICLE
Loculoascomycete origins and evolution of filamentous ascomycete morphology based on 18S rRNA gene sequence data
Department of Botany, University of British Columbia, Vancouver, Canada. berb
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