Molecular phylogeny and radiation time of Erysiphales inferred from the nuclear ribosomal DNA sequences
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概要
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Phylogenetic relationships of Erysiphals within Ascomycota were inferred from the newly determined sequences of the 18SrDNA and partial sequences of the 28SrDNA including the D1 and D2 regions of 1O Erysiphales taxa．Phylogenetic analyses revealed that the Erysiphales form a distinct clade among ascomycetous fungi, Suggesting that the Erysiphales diverged from a single ancestral taxon. The Myxotrichaceae of the Onygenales was distantly related to the other onygenalean families and was the sister group to the Erysiphales clade, with which it combined to form a clade．The Erysiphales / Myxotrichaceae clade was also closely related to some discomycetous fungi (Leotiales, Cyttariales and Thelebolaceae) including taxa that form cleistothecial ascomata. The present molecular analyses as well as previously reported morphological ofservations ssuggest the possible exsistence of a novel evolutionary pathway from cleistothecial discomycetous fungi to Erysiphales and Myxotrichaceae. However, since most of these fungl, except for the Erysiphales，are saprophytic on dung and/or plant materials．the questions of how and why an obligate biotroph like the Erysiphales radiated from the saprophytjc fungi remain to be addressed. We also estimated the radiation time of the Erysiphales using the 18SrDNA sequences and the two molecular clocks that have been previously reported. The calculation showed that the Erysiphales split from the Myxotrichaceae 190-127 myr ago. Since the radiation time of the Erysiphales does not exceed 230 myr ago, even when allowance is made for the uncertainty of the molecular clocks, it is possible to consider that the Erysiphales evolved after the radiation of angiosperms. The results of our calculation also showed that the first radiation within the Erysiphales(138-92 myr ago）coincided with the date of a major diversification of angiosperms(130-90 myr ago). These results may support our early assumption that the radiation of the Erysiphales coincided with the evolution of angiosperm plants.
- Mycological Society of Japanの論文
- 2000-10-15
著者
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Sato Yukio
College Of Technology Toyama Prefectural University
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Takamatsu Susumu
Faculty Of Bioresources Mie University
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Mori Yasuhiro
Faculty Of Bioresources Mie University
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