Abstract
Ultrastructural localization of peroxidatic activity was investigated in the chytrid Entophlyctis variabilis with the 3,3′-diaminobenzidine (DAB) cytochemical prodedure. The subcellular distribution of reaction product varied with changes in pH of the DAB medium and with the developmental stage of the fungus. Incubations in the DAB reaction medium at pH 9.2 produced an electron dense reaction product within single membrane bounded organelles which resembled microbodies but which varied in shapes from elongate to oval. At this pH the cell wall also stained darkly. When the pH of the DAB medium was lowered to pH 8.2 or 7.0, DAB oxidation product was localized within mitochondrial cristae as well as in microbodies and zoosporangial walls. As soon as zoospores were completely cleaved out of the zoosporangial cytoplasm, endoplasmic reticulum (ER) also stained. When the wall appeared around the encysted zoospore, ER staining was no longer found. The influence of the catalase inhibitor, aminotriazole, and the inhibitors of heme enzymes, sodium azide and sodium cyanide, on the staining patterns within cells incubated in the DAB media indicates that microbody staining is due to both catalase and peroxidase, mitochondrial staining is due to cytochrome c, and ER staining is due to peroxidase.
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Abbreviations
- DAB:
-
3,3′-diaminobenzidine-HCl
- ER:
-
endoplasmic reticulum
References
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Powell, M.J. Ultrastructural cytochemistry of the diaminobenzidine reaction in the aquatic fungus Entophlyctis variabilis . Arch. Microbiol. 114, 123–136 (1977). https://doi.org/10.1007/BF00410773
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DOI: https://doi.org/10.1007/BF00410773