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Fig. 6 | BMC Ecology and Evolution

Fig. 6

From: Adaptive evolution of Moniliophthora PR-1 proteins towards its pathogenic lifestyle

Fig. 6

Proposed model for the adaptive evolution of PR-1 proteins in Moniliophthora towards the pathogenic lifestyle. All Moniliophthora PR-1 proteins derived independently from two ancient clades (PR-1b-like and PR-1d-like) within the Agaricales order, as indicated in PR-1 phylogeny. The subsequent diversification of PR-1a and PR-1e from PR-1b, and PR-1j from PR-1d, occured in putative saprotroph lineages before the divergence of Moniliophthora genus, suggesting a diversification not related to pathogenicity. Within Moniliophthora hypothetical pathogenic ancestors, five other PR-1 proteins were derived (c from j, h from b, f-g-i from e) and most of these new lineages showed evidence of positive selection in M. perniciosa samples (indicated by pink circles). New PR-1 copies (n and i2 in M. roreri, l and k in M. perniciosa) diverged within M. species. Recently diversified PR-1 genes in Moniliophthora, not only show an elevated rate of evolution and positive selection evidence but are also predominantly expressed during the biotrophic interaction (indicated by green highlights). This supports the hypothesis that these proteins accumulated adaptive changes related to pathogen lifestyle that might also contribute to the host specialization observed in Moniliophthora species and biotypes

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