Molecular variation within and among species of Harpellales
نویسندگان
چکیده
Intraand interspecific variation of the nu clear ribosomal internal transcribed spacers (ITS) of 77 Smittium isolates and related genera was studied using RFLP. Due to the sequence and length varia tion encountered, the ITS is unsuitable for compar ison at the species level within Smittium, as presently delimited. Intraand interspecific variation of 18S rDNA was also analyzed. Cladistic analysis of 32 new 18S rDNA sequences resolved at least five lineages and suggests that Smittium is not monophyletic. In addition, 17 18S rDNA sequences from 5 orders of Zygomycota were included to assess phylogenetic re lationships with the Trichomycetes. The kickxellid or igin of Trichomycetes was not strongly supported.
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