Phylogenetic relationships among eleven selected species of Aspergillus and associated teleomorphic genera estimated from 18S ribosomal RNA partial sequences.
1991; Microbiology Research Foundation; Volume: 37; Issue: 3 Linguagem: Inglês
10.2323/jgam.37.289
ISSN1349-8037
AutoresJye-Ming CHANG, Hiroshi Oyaizu, Junta Sugiyama,
Tópico(s)Mycotoxins in Agriculture and Food
ResumoPartial sequence comparisons of 18S ribosomal RNA comprising 558 nucleotides in the positions 384-562, 942-1119, and 1419-1623 were used to determine the evolutionary affinities among eleven species of Aspergillus and associated teleomorphs, including five species of the most diverse sect. Ornati, and two species of Penicillium with teleomorphs. The species compared were Eurotium repens, Aspergillus fumigatus, Sclerocleista ornata, Hemicarpenteles paradoxus, H. acanthosporus, Warcupiella spinulosa, A. raperi, Emericella nidulans, A: flavus, A. oryzae, Chaetosartorya cremea, Eupenicillium crustaceum, and Talaromyces flavus. Phylogenetic trees were constructed by the unweighted pair-group method using arithmetic averages (UPGMA) and the neighbor-joining (NJ) method from evolutionary distances (Knuc). The sequence differences between the eleven species of Aspergillus and associated teleomorphs were slight, indicating only recent diversification. These observations contrast with the diversity of teleomorphs and the heterogeneity of ubiquinone systems. Both UPGMA and NJ trees based on the above sequence data, and the present known data of 18S rRNA partial sequences comprising a total of 188 nucleotides in the positions 1419-1607 from Aspergillus, Penicillium and associated teleomorphs showed that the anamorphic genera Aspergillus and Penicillium are well separated from each other. The distinguished character of "aspergillum" for Aspergillus and of "penicillus" for Penicillium appears to be a phylogenetic indicator.
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