title: Variation in functional ascospore parts in the ascomycetous yeast Dipodascopsis uninucleata.
abstract: A variation in functional ascospore morphology was detected using electron microscopy (EM) in two varieties of the yeast Dipodascopsis uninucleata, i.e., D. uninucleata var. uninucleata and D. uninucleata var. wickerhamii. It was found that the latter produces ascospores characterized by the absence of small surface hooks which have been implicated in the release and re-assembly of ascospores in D. uninucleata var. uninucleata. These varieties are closely related on the basis of their mode of sexual reproduction, ascospore morphology as observed under the light microscope, physiological characteristics as well as the extent of divergence in the variable D1/D2 domain of the large subunit 26S ribosomal DNA.
authors.affiliation: Department of Microbiology, Biochemistry and Food Science, UNESCO MIRCEN: Industrial Biotechnology, P.O. Box 339, Bloemfontein 9301, South Africa.
authors.forename: A S
authors.initials: AS
authors.lastname: Bareetseng
authors.forename: J L F
authors.initials: JL
authors.lastname: Kock
authors.forename: C H
authors.initials: CH
authors.lastname: Pohl
authors.forename: E E
authors.initials: EE
authors.lastname: Pretorius
authors.forename: P W J
authors.initials: PW
authors.lastname: Van Wyk
mesh_terms: D010641:Phenotype; D004718:Saccharomycetales / Q000502:physiology / Q000648:ultrastructure*; D013172:Spores, Fungal / Q000648:ultrastructure*