Resolved phylogeny and biogeography of the root pathogen Armillaria and its gasteroid relative, Guyanagaster

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• 作者：Rachel A. Koch ; Andrew W. Wilson ; Olivier Séné ; Terry W. Henkel…
• 关键词：Armillaria root rot ; Cameroon ; Eocene ; Fungal taxonomy ; Gasteromycetation ; Guiana Shield ; Melanin ; Mushroom evolution ; Physalacriaceae ; Systematics
• 刊名：BMC Evolutionary Biology
• 出版年：2017
• 出版时间：December 2017
• 年：2017
• 卷：17
• 期：1
• 全文大小：3100KB
• 刊物主题：Evolutionary Biology; Animal Systematics/Taxonomy/ Biogeography; Entomology; Genetics and Population Dynamics; Life Sciences, general;
• 出版者：BioMed Central
• ISSN：1471-2148
• 卷排序：17

文摘

BackgroundArmillaria is a globally distributed mushroom-forming genus composed primarily of plant pathogens. Species in this genus are prolific producers of rhizomorphs, or vegetative structures, which, when found, are often associated with infection. Because of their importance as plant pathogens, understanding the evolutionary origins of this genus and how it gained a worldwide distribution is of interest. The first gasteroid fungus with close affinities to Armillaria—Guyanagaster necrorhizus—was described from the Neotropical rainforests of Guyana. In this study, we conducted phylogenetic analyses to fully resolve the relationship of G. necrorhizus with Armillaria. Data sets containing Guyanagaster from two collecting localities, along with a global sampling of 21 Armillaria species—including newly collected specimens from Guyana and Africa—at six loci (28S, EF1α, RPB2, TUB, actin-1 and gpd) were used. Three loci—28S, EF1α and RPB2—were analyzed in a partitioned nucleotide data set to infer divergence dates and ancestral range estimations for well-supported, monophyletic lineages.