Contributions of North American endophytes to the phylogeny, ecology, and taxonomy of Xylariaceae (Sordariomycetes, Ascomycota)

Jana M. U'Ren, Jolanta Miadlikowska, Naupaka B. Zimmerman, François Lutzoni, Jason E. Stajich, Anne E Arnold

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

The Xylariaceae (Sordariomycetes) comprise one of the largest and most diverse families of Ascomycota, with at least 85 accepted genera and ca. 1343 accepted species. In addition to their frequent occurrence as saprotrophs, members of the family often are found as endophytes in living tissues of phylogenetically diverse plants and lichens. Many of these endophytes remain sterile in culture, precluding identification based on morphological characters. Previous studies indicate that endophytes are highly diverse and represent many xylariaceous genera; however, phylogenetic analyses at the family level generally have not included endophytes, such that their contributions to understanding phylogenetic relationships of Xylariaceae are not well known. Here we use a multi-locus, cumulative supermatrix approach to integrate 92 putative species of fungi isolated from plants and lichens into a phylogenetic framework for Xylariaceae. Our collection spans 1933 isolates from living and senescent tissues in five biomes across the continental United States, and here is analyzed in the context of previously published sequence data from described species and additional taxon sampling of type specimens from culture collections. We found that the majority of strains obtained in our surveys can be classified in the hypoxyloid and xylaroid subfamilies, although many also were found outside of these lineages (as currently circumscribed). Many endophytes were placed in lineages previously not known for endophytism. Most endophytes appear to represent novel species, but inferences are limited by potential gaps in public databases. By linking our data, publicly available sequence data, and records of ascomata, we identify many geographically widespread, host-generalist clades capable of symbiotic associations with diverse photosynthetic partners. Concomitant with such cosmopolitan host use and distributions, many xylariaceous endophytes appear to inhabit both living and non-living plant tissues, with potentially important roles as saprotrophs. Overall, our study reveals major gaps in the availability of multi-locus datasets and metadata for this iconic family, and provides new hypotheses regarding the ecology and evolution of endophytism and other trophic modes across the family Xylariaceae.

Original languageEnglish (US)
Pages (from-to)210-232
Number of pages23
JournalMolecular Phylogenetics and Evolution
Volume98
DOIs
StatePublished - May 1 2016

Fingerprint

Sordariomycetes
Xylariaceae
Endophytes
Ascomycota
endophyte
Phylogeny
endophytes
Ecology
phylogeny
ecology
taxonomy
Lichens
phylogenetics
lichen
lichens
Specimen Handling
host use
loci
ascomata
axenic culture

Keywords

  • Daldinia loculata
  • Endolichenic fungi
  • Symbiosis
  • Systematics
  • Xylaria cubensis
  • Xylariomycetidae

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Molecular Biology
  • Genetics

Cite this

Contributions of North American endophytes to the phylogeny, ecology, and taxonomy of Xylariaceae (Sordariomycetes, Ascomycota). / U'Ren, Jana M.; Miadlikowska, Jolanta; Zimmerman, Naupaka B.; Lutzoni, François; Stajich, Jason E.; Arnold, Anne E.

In: Molecular Phylogenetics and Evolution, Vol. 98, 01.05.2016, p. 210-232.

Research output: Contribution to journalArticle

U'Ren, Jana M. ; Miadlikowska, Jolanta ; Zimmerman, Naupaka B. ; Lutzoni, François ; Stajich, Jason E. ; Arnold, Anne E. / Contributions of North American endophytes to the phylogeny, ecology, and taxonomy of Xylariaceae (Sordariomycetes, Ascomycota). In: Molecular Phylogenetics and Evolution. 2016 ; Vol. 98. pp. 210-232.
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