Accelerated nrDNA evolution and profound AT bias in the medicinal fungus cordyceps sinensis
作者： Øyvind Stensrud , Trond Schumacher , Kamran Shalchian-Tabrizi , Ingeborg Bjorvand Svegården , Håvard Kauserud
DOI: 10.1016/J.MYCRES.2007.01.015
关键词: Phylogenetic tree 、 GenBank 、 Clade 、 Biology 、 Molecular phylogenetics 、 Evolutionary biology 、 Clavicipitaceae 、 Taxon 、 Cordyceps 、 Botany 、 Species complex
摘要: Cordyceps sinensis is a reputed medicinal fungus growing parasitically on buried larvae of ghost moths in Asian high-altitude grassland ecosystems. We have analysed the intraspecific ITS nrDNA (ITS1, 5.8S gene, ITS2) variation among 71 sequences C. available EMBL/Genbank. The sequences, submitted to Bayesian ML analyses, were distributed into five groups, referred as A-E. Nine (groups D and E) grouped with distantly related hypocrealean/clavicipitalean taxa are interpreted erroneously accessioned under wrong taxon names. remaining 62 constituted three highly supported clades A-C), that may represent cryptic (phylogenetic) species currently ascribed sinensis. A remarkably high sequence divergence occurred gene between groups. Sequences groups B C showed accelerated substitution rates AT nucleotide bias. hypothesize evolution bias been caused by shift life historical attributes or ecology. also suggest recorded differences effects populations be attributed existence genetically differentiated chemotypes this morphotaxon.
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