Glomus perpusillum, a new arbuscular mycorrhizal fungus

Janusz Blaszkowski, Gabor M. Kovács, Tímea Balazs

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

A new arbuscular mycorrhizal fungal species of genus Glomus, G. perpusillum (Glomeromycota), forming small, hyaline spores is described and illustrated. Spores of G. perpusillum were formed in hypogeous aggregates and occasionally inside roots. They are globose to subglobose, (10-)24(-30) μm diam, rarely egg-shaped, oblong to irregular, 18-25 × 25-63 μm. The single spore wall of G. perpusillum consists of two permanent layers: a finely laminate, semiflexible to rigid outer layer and a flexible to semiflexible inner layer. The inner layer becomes plastic and frequently contracts in spores crushed in PVLG-based mountants and stains reddish white to grayish red in Melzer's reagent. Glomus perpusillum was associated with roots of Ammophila arenaria colonizing sand dunes of the Mediterranean Sea adjacent to Calambrone, Italy, and this is the only site of its occurrence known to date. In single-species cultures with Plantago lanceolata as host plant, G. perpusillum formed vesicular-arbuscular mycorrhiza. Phylogenetic analyses of partial SSU sequences of nrDNA placed the species in Glomus group A with no affinity to its subgroups. The sequences of G. perpusillum unambiguously separated from the sequences of described Glomus species and formed a distinct clade together with in planta arbuscular mycorrhizal fungal sequences found in alpine plants.

Original languageEnglish
Pages (from-to)247-255
Number of pages9
JournalMycologia
Volume101
Issue number2
DOIs
Publication statusPublished - Mar 1 2009

Keywords

  • Arbuscular fungi
  • Glomeromycota
  • Molecular phylogeny
  • Mycorrhizae
  • New species

ASJC Scopus subject areas

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

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