Nitrification in relation to growth in Aspergillus flaws

Gool, A. P. Van; Schmidt, E. L.

doi:10.1016/0038-0717(73)90009-6

Cited by 14 publications

(3 citation statements)

References 10 publications

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“…Nitrate production from various nitrogen sources was assayed by treating the slurry with three nitrogen ammendments: no added nitrogen, (NH4)2SO4 (0.5 mM), or peptone (100 mg/liter or approximately 1 mM N; Nutritional Biochemical Corp.). Peptone was used as a substrate because it provides a source of readily available organic N, and it has been commonly used as a substrate in studies on heterotrophic nitrification (26,27).…”

Section: Methodsmentioning

confidence: 99%

Identification of Heterotrophic Nitrification in a Sierran Forest Soil

Schimel

Firestone

Killham

1984

Appl Environ Microbiol

201

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A potential for heterotrophic nitrification was identified in soil from a mature conifer forest and from a clearcut site. Potential rates of NO2production were determined separately from those of NO3 by using acetylene to block autotrophic NH4+ oxidation and chlorate to block NO2-oxidation to N03in soil slurries. Rates of NO2-production were similar in soil from the forest and the clear-cut site and were strongly inhibited by acetylene. The rate of N03-production was much greater than that of N02production, and N03production was not significantly affected by acetylene or chlorate. Nitrate production was partially inhibited by cycloheximide, but was not significantly reduced by streptomycin. Neither the addition of ammonium nor the addition of peptone stimulated N03production. 15N labeling of the NH4+ pool demonstrated that N03was not coming from NH4'. The potential for heterotrophic nitrification in these forest soils was greater than that for autotrophic nitrification.

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Section: Methodsmentioning

confidence: 99%

Identification of Heterotrophic Nitrification in a Sierran Forest Soil

Schimel

Firestone

Killham

1984

Appl Environ Microbiol

201

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“…(Clearly, fungal nitrification in coniferous forest soils must be considered in close relation to the patterns of nitrogen mineralisation/immobilisation that are occurring). Indeed, any renewal of active biosynthesis and growth, such through the addition of further substrate carbon, will inhibit nitrification and assimilation of nitrate (Van Gool and Schmidt, 1973). These workers suggested that, if fungal nitrification is physiologically significant, it must be concerned with the endogenous respiration of the mycelium.…”

Section: The Ecophysiology Of Fungal Nitrifiers -Relation To Their Acmentioning

confidence: 99%

“…Van Gool and Schmidt (1973) proposed that the rather low specific fungal nitrification rates may be due to the low turnover of the enzyme system involved -a change from the cytochrome form of terminal electron transfer/ respiration of the mycelium when growing actively, to the flavoprotein form may be occurring in the mycelium when fully grown at the initiation of nitrate production. It has certainly been shown that fungal nitrification is not cytochromedependent (Molina and Alexander, 1971).…”

Section: The Ecophysiology Of Fungal Nitrifiers -Relation To Their Acmentioning

confidence: 99%

Nitrification in coniferous forest soils

Killham

1990

Plant Soil

163

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Net nitrification rates tend to be low or negligible in the forest floor of many coniferous forests of North-East Scotland. The most likely process controls are substrate availability, pH, allelopathy, water potential, nutrient status and temperature. These are discussed in relation to field and laboratory studies of net and potential rates of nitrification.Fungi make up by far the largest part of the nitrifier community in the coniferous forest floor. Very little is known about the distribution and activity of autotrophs in these systems, although it is certain that in vitro evidence suggesting autotrophs cannot nitrify at pH levels characteristic of coniferous forest soils is unrealistic.Because of the metabolic diversity of nitrifying fungi, a variety of organic and inorganic nitrification pathways may exist in coniferous forests. The possible involvement of free radicles in fungal nitrification in coniferous forest soils is also suggested.A complete understanding of nitrification in coniferous forest soils can only result from field characterisation of N flux such as through the use of 15N. This must be combined with ecophysiological characterisation of the organisms involved in order that the complexity of nitrification in coniferous forest soils can be resolved.

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Mineral transformations by fungi in culture and in soils

Wainwright

1981

J Plant Nutrition & Soil

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Although micro‐organisms are regarded as the principal agents of mineral cycling in soils, the role of bacteria has generally been emphasized, while that of fungi has been neglected. Fungi are able to transform the majority of elements in vitro but whether they play an important role in soil is as yet unknown. There is sufficient circumstantial evidence from soil studies to suggest that fungi may under certain conditions nitrify and oxidize reduced forms of sulphur. Their role in denitrification and sulphate reduction process is more speculative. While they appear incapable of nitrogen fixation, fungi undoubtedly play a major role in the mineralization of organic N,P, and S in soils, in the solubilization of insoluble phosphates, and participate in oxidation of manganese. Perhaps one of their most important roles is in the dissolution of silica and rocks thus releasing ions into the soil solution during weathering. The ability of fungi to oxidize elements in vitro does not compare with that of the chemoautotrophic bacteria. On the other hand in vitro activity tells us little about the activity of an organism in the soil. At present our appreciation of the part played by fungi in mineral cycling in soils is limited by the techniques available, but there is little doubt that they have a major role to play in the cycling of elements other than carbon.

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Nitrification in relation to growth in Aspergillus flaws

Cited by 14 publications

References 10 publications

Identification of Heterotrophic Nitrification in a Sierran Forest Soil

Identification of Heterotrophic Nitrification in a Sierran Forest Soil

Nitrification in coniferous forest soils

Mineral transformations by fungi in culture and in soils

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