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Antonie van Leeuwenhoek

, Volume 47, Issue 5, pp 411–421 | Cite as

Trichosporonoides nigrescens sp. nov., a new xerophilic yeast-like fungus

  • Ailsa D. Hocking
  • J. I. Pitt
Taxonomy

Abstract

A new yeast-like fungus isolated from jam on two occasions is described as Trichosporonoides nigrescens. It is a true xerophile, able to grow at water activities at least as low as 0.75. For this reason, its carbon assimilation pattern was examined using both dilute (standard) and concentrated carbon sources: six to nine compounds not assimilated at the standard concentrations of 0.5% (0.001 to 0.1 mol/kg) were assimilated at 1.5 to 2.0 mol/kg. Cell wall and septal ultrastructure, DNA base ratios, and the nuclear cycle were examined to determine the generic and higher taxonomic affinities of this microorganism. All properties were consistent with its assignment to Trichosporonoides Haskins et Spencer. However, while ultrastructure indicated an affinity with the Basidiomycetes, the mitotic nuclear cycle and the xerophilic nature of this fungus suggested an Ascomycete affinity. The GC content (57%) is consistent with assignment to either. No teleomorphic state was found.

Keywords

Cell Wall Carbon Source Concentrate Carbon Water Activity Carbon Assimilation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© H. Veenman & Zonen B. V. 1981

Authors and Affiliations

  • Ailsa D. Hocking
    • 1
  • J. I. Pitt
    • 1
  1. 1.CSIRO Division of Food ResearchNorth RydeAustralia

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