Ultrastructure of dimorphic transformation in paracoccidioides brasiliensis.

Abstract:

:The fine structure of Paracoccidioides brasiliensis undergoing temperature-dependent transformation from mycelium to yeast and vice versa (M right harpoon over left harpoon Y) was studied. The transitional form to mycelium from the yeast appears as an elongated bud that extends from the yeast and which has a mixture of characteristics from both the yeast and the mycelium. The transitional form to yeast from the mycelium starts with enlargement of the interseptal spaces and cracking of the outer electron-dense layer of the cell wall of the hypha. Later the interseptal spaces tend to become round and separate. In M --> Y only few interseptal spaces seem to transform. The yeast is produced by self-transformation of the hypha. In Y --> M a new structure is formed and the yeast dies. Intrahyphal hyphae are observed during the transformation from M --> Y, and intrayeast hyphae during the Y --> M. Due to the high mortality and breakage observed in both types of transformations, we believe that wound of the yeast or the mycelium could elicit this phenomenon.

journal_name

J Bacteriol

journal_title

Journal of bacteriology

authors

Carbonell LM

doi

10.1128/JB.100.2.1076-1082.1969

subject

Has Abstract

pub_date

1969-11-01 00:00:00

pages

1076-82

issue

2

eissn

0021-9193

issn

1098-5530

journal_volume

100

pub_type

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