Molecular characterization of pezizalean ectomycorrhizas associated with pinyon pine during drought

Galena J. Gordon, Catherine A Gehring

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Recent studies using molecular analysis of ectomycorrhizas have revealed that ascomycete fungi, especially members of the order Pezizales, can be important members of ectomycorrhizal (EM) fungal communities. However, little is known about the ecology and taxonomy of many of these fungi. We used data collected during a wet and a dry period to test the hypothesis that pezizalean EM fungi associated with pinyon pine (Pinus edulis) responded positively to drought stress. We also assessed the phylogenetic relationships among six, unknown pezizalean EM fungi, common to our study sites, using rDNA sequences from the internal transcribed spacer and large subunit (LSU) regions of the ribosomal DNA. Sequences of these fungi were then compared to sequences from known taxa to allow finer-scale identification. Three major findings emerged. First, at two sites, pezizalean EM were 44-95% more abundant during a dry year than a wetter year, supporting the hypothesis that pezizalean EM fungi respond positively to dry conditions. Second, four of the six unknown pezizalean EM fungi associated with P. edulis separated from one another consistently regardless of site or year of collection, suggesting that they represented distinct taxa. Third, comparison with LSU sequences of known members of the Pezizales indicated that these four taxa grouped within the genus Geopora of the family Pyronemataceae. Our results provide further evidence of the importance of pezizalean fungi in the ectomycorrhizal symbiosis and demonstrate high local abundance of members of the genus Geopora in drought-stressed pinyon-juniper woodlands.

Original languageEnglish (US)
Pages (from-to)431-441
Number of pages11
JournalMycorrhiza
Volume21
Issue number5
DOIs
StatePublished - Jul 2011

Fingerprint

Pinus edulis
Pinus
ectomycorrhizae
Droughts
Fungi
drought
fungus
fungi
Geopora
Pezizales
Ribosomal DNA
Pyronemataceae
pinyon-juniper
Juniperus
Ascomycota
Symbiosis
molecular analysis
fungal communities
drought stress
symbiosis

Keywords

  • Ascomycete ectomycorrhiza
  • Drought
  • Geopora
  • Pezizales

ASJC Scopus subject areas

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

Cite this

Molecular characterization of pezizalean ectomycorrhizas associated with pinyon pine during drought. / Gordon, Galena J.; Gehring, Catherine A.

In: Mycorrhiza, Vol. 21, No. 5, 07.2011, p. 431-441.

Research output: Contribution to journalArticle

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