Phylogenetic analyses of penicillia based on partial calmodulin gene sequences

Partial sequences (about 600 nucleotides) of the calmodulin gene were used for the phylogenetic studies on Eupenicillium, Talaromyces and Penicillium. This region is from the 3rd base of the codon for the 9th amino acid Gln to the 3rd base of the codon for the 122th amino acid Val, flanking parts of the 2nd and 5th exons with complete sequences of two exons and three introns. Seventy-six isolates of 56 taxa of penicillia were involved. The nucleotide sequences with and without introns were analyzed respectively using the neighbor-joining (NJ) and maximum parsimony (MP) methods. The cluster analysis on relative synonymous codon usage (RSCU) of each sequence was also carried out. The fact that species of penicillia belong to the two subfamilies of the Trichocomaceae proposed by Malloch based on traditional methods is supported by our molecular data, whereas, the development of asci and patterns of penicilli show little phylogenetic information. Nine groups in the lineage of Eupenicillium and two in that of Talaromyces were recognized in our studies. In addition to the teleomorph-holomorph-anamorph evolutionary model of penicillia suggested by LoBuglio et al., and Pitt, we proposed that a mutation bias of holomorphs/anamorphs with or without selection is another evolutionary path of these organisms.

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