Ultrastructural studies of the mycelium-to yeast transformation of Sporothrix schenckii.

Journal of Bacteriology
R G GarrisonF Mariat

Abstract

Fine details of the internal and external morphology of the in vitro mycelial phase (MP) to yeastlike phase (YP) transition of the dimorphic fungal pathogen Sporothrix schenckii are shown in electron micrographs of ultrathin sections. Morphological transformation at the ultrastructural level was observed to occur by direct formation of budlike structures at the tips and along the hyphae and by oidial cell formation. Direct budding of yeast from conidiospores was not observed. Early transitional forms arising by direct blastic action from the MP possessed conspicuous electron-dense microfibrillar material at the outer limits of the cell wall. The electron density of this microfibrillar material was enhanced by staining with acidified dialyzed iron. It is believed that this extracellular material may be composed in part of an acid mucosubstance. No acid phosphatase activity was associated with this microfibrillar material. This substance was found to be a characteristic of the outer limits of the cell wall of the YP of S. schenckii. Oidial YP cell formation occurred later during the transition. The cell wall of the developing oidial YP transitional form arose from an inner layer of the converting hyphae. No consupicuous alteratio...Continue Reading

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Citations

Jan 1, 1990·Journal of Basic Microbiology·A Svoboda, A Trujillo-Gonzalez
Feb 1, 1987·Journal of Medical and Veterinary Mycology : Bi-monthly Publication of the International Society for Human and Animal Mycology·D B WetheredS A Gumaa
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Oct 7, 2011·Clinical Microbiology Reviews·Mônica Bastos de Lima BarrosArmando Oliveira Schubach
Aug 16, 2011·Mycopathologia·Zhenying ZhangXiaoming Liu
Nov 30, 1979·Mycopathologia·R G GarrisonJ E Wagner
Jun 1, 1996·Journal of Medical and Veterinary Mycology : Bi-monthly Publication of the International Society for Human and Animal Mycology·H Han-YakuT Nishikawa
Nov 18, 2010·Mycopathologia·Gerardo Sandoval-BernalMyrna Sabanero
Nov 9, 2017·Molecular Medicine Reports·Zhenying ZhangShixin Han
Feb 1, 1988·Mycopathologia·S Ayala, N Rodríguez-Del Valle
Dec 1, 1980·Microbiological Reviews·L R Travassos, K O Lloyd

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