Together with V. volvacea, 14 fungal species assigned mainly to the Basidiomycota (phyla are not italicized) and Ascomycota were used in the phylogenomic analysis. Genomic data for eight species (Agaricus bisporus, Aspergillus niger, Ganoderma lucidum, Phanerochaete chrysosporium, Puccinia graminis, Saccharomyces cerevisiae, Schizophyllum commune and Trichoderma reesei) were obtained from the Joint Genome Institute (JGI), and for five species (Coprinopsis cinerea, Cryptococcus neoformans, Neurospora crassa, Rhizopus oryzae, Ustilago maydis) from the Broad Institute. Single-copy orthologous protein sequences from the genomes of 14 species were obtained using our custom perl program. The tandem concatenated sequences consisting of 178 single-copy orthologous sequences from the 14 species were then used to construct a phylogenomic tree using the neighbor-joining method [85] (link) (bootstrap = 1000, JTT matrix). Timescale estimation of phylogenomic analysis with calibration was implemented in the codeml program [86] (link) of the PAML package (version 4) [70] (link). The divergence time between species was estimated using PAML [87] (link) by calibrating against the reassessed origin of U. maydis at 550 million years ago [88] (link). We used both global and local clock methods [89] (link) to estimate the timescale of species divergence, and linear regression was applied to test the congruence between the global and local clocks.
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