ISSN:
1432-072X
Keywords:
Cyanide-resistant respiration
;
Cytochrome oxidase
;
Salicylhydroxamic acid
;
Oxygen
;
Oomycetes
;
Chytridiomycetes
;
Aerotolerant anaerobe
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract We have demonstrated a significant capacity for O2 uptake in Blastocladia ramosa (Chytridiomycetes, Blastocladiales), Aqualinderella fermentans (Oomycetes, Leptomitales) and Pythiogeton sp. (Oomycetes, Peronosporales), all believed from previous studies to be obligately-fermentative aerotolerant anaerobes. However, whereas O2 uptake in related aerobes is strongly inhibited by KCN, O2 utilization by these fermentative species appears to be completely insensitive to cyanide but sensitive to salicylhydroxamic acid, an inhibitor of diverse non-cytochrome oxidases. Our results therefore tend to support, rather than refute, the presumption of an obligately-fermentative metabolism. The findings are corroborative evidence than cyanide-resistant O2 uptake is a phenomenon of widespread phylogenetic significance. Although the role of O2 uptake in obligately-fermentative aquatic fungi is not clear, the observations are consistent with the general conclusion that cyanide-resistant respiration does not contribute substantially to ATP formation.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00429397
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