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作者Healy, Rosanne A.;Arnold, A. Elizabeth;Bonito, Gregory;Huang, Yu-Ling;Lemmond, Benjamin;Pfister, Donald H.;Smith, Matthew E.
出版日期20210720
著作名稱Endophytism in Pezizomycetes: the exception or the rule?
會議名稱Botany 202
會議地點Virtual
會議日期20210720
主辦單位BSA/MSA
國際性會議Y
主題真菌
關鍵字Endophytes; Pezizales; endolichenic; pyrophilous fungi; Mycology.
摘要Fungal endophytes are common within healthy plants and lichens around the globe. Several major lineages of non-lichenized Ascomycota contain diverse endophytes, but endophytism is least studied among the Pezizomycetes. Pezizomycetes consists of one order (Pezizales), 23 families, and approximately 2,000 species known as plant pathogens, ectomycorrhizal fungi, and saprobes. However, the endophytic habit has not traditionally been considered an important ecological strategy in Pezizomycetes. Recent culture-based and sequence-based studies have detected diverse Pezizomycetes as endophytes in plants and lichens, but there has been no comprehensive assessment of endophytism in this lineage. We used a phylogenetic framework based on >4000 ITS and 28S rDNA sequences to determine how many Pezizomycetes have been found as endophytes, what lineages contain endophytes, and the main nutritional modes of Pezizomycetes that can act as endophytes. We conservatively delimited >160 OTUs of Pezizomycete endophytes in at least 16 families. These include representatives from 50 genera as well as 13 lineages that could not be assigned to a known genus. Endophytic Pezizomycetes occur in lineages with diverse trophic strategies, including saprobes, plant pathogens, and more rarely, ectomycorrhizal fungi. Endophytes were particularly common among fire-adapted and pyrophilous Pezizomycetes with evidence of endophytism in 12 of those genera. Some endophytic taxa were found on only one or two hosts but many occupy a broad range of hosts. We documented endophytes in two lineages with no previously known endophytes (the ectomycorrhizal genus Otidea and dung saprobe genus Coprotus), as well as one species that was divergent from any taxa represented in GenBank and could not be assigned to a known family. This species is represented by four isolates from angiosperm leaves and lichens in an Alaskan boreal forest and represents a unique lineage nested between the two uniformly ECM families, Tuberaceae and Geomoriaceae. Together these results suggest that endophytism is widespread across the Pezizomycetes and highlights how culture collections – especially when characterized by barcode sequences – can be important for defining the ecology and phylogenetic relationships of fungal lineages in the Pezizomycetes and beyond.
系統號NO000006260

Aug 20 2021 11:12:17
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