Abstract
We examined the phylogenetic relationships among five heterothallic species ofNeurosporausing restriction fragment polymorphisms derived from cosmid probes and sequence data from the upstream regions of two genes,al-1andfrq.Distance, maximum likelihood, and parsimony trees derived from the data support the hypothesis that strains assigned toN. sitophila, N. discreta,andN. tetraspermaform respective monophyletic groups. Strains assigned toN. intermediaandN. crassa,however, did not form two respective monophyletic groups, consistent with a previous suggestion based on analysis of mitochondrial DNAs thatN. crassaandN. intermediamay be incompletely resolved sister taxa. Trees derived from restriction fragments and theal-1sequence positionN. tetraspermaas the sister species ofN. sitophila.None of the trees produced by our data supported a previous analysis of sequences in the region of the mating type idiomorph that groupedN. crassaandN. sitophilaas sister taxa, as well asN. intermediaandN. tetraspermaas sister taxa. Moreover, sequences fromal-1, frq,and the mating-type region produced different trees when analyzed separately. The lack of consensus obtained with different sequences could result from the sorting of ancestral polymorphism during speciation or gene flow across species boundaries, or both.
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