Oxygen requirement for denitrification by the fungus Fusarium oxysporum View Full Text


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Article Info

DATE

2001-01

AUTHORS

Zhemin Zhou, Naoki Takaya, Maria Antonina C. Sakairi, Hirofumi Shoun

ABSTRACT

The effects of dioxygen (O2) on the denitrification activity of the fungus Fusarium oxysporum MT-811 in fed-batch culture in a stirred jar fermentor were examined. The results revealed that fungal denitrifying activity requires a minimal amount of O2 for induction, which is repressed by excess O2. The optimal O2 supply differed between the denitrification substrates : 690 micromol O2 x h(-1) (g dry cell wt.)(-1) for nitrate (NO3-) and about 250 micromol O2 x h(-1) (g dry cell wt.)(-1) for nitrite (NO2-). The reduction of NO3- required more O2 than that of NO2- . With an optimal O2 supply, 80% and 52% of nitrogen atoms in NO3- and NO2-, respectively, were recovered as the denitrification product N2O. These features of F. oxysporum differ from those of bacterial denitrifiers that work exclusively under anoxic conditions. The denitrification activity of F. oxysporum MT-811 mutants with impaired NO3- assimilation was about double that of the wild-type strain, suggesting competition for the substrate between assimilatory and dissimilatory types of NO3- reduction. These results showed that denitrification by F. oxysporum has unique features, namely, a minimal O2 requirement and competition with assimilatory NO3-. More... »

PAGES

19-25

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s002030000231

DOI

http://dx.doi.org/10.1007/s002030000231

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1047132313

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/11271416


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