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Nitrogen Isotope Fractionation Associated with Nitrate Reductase Activity and Uptake of NO3− by Pearl Millet
Open accessAbstract
Nitrogen isotope fractionation by Pearl Millet (Pennisetum americanum L. and P. mollissimum L.) grown on nitrate was associated with nitrate reductase activity. Fractionation was evidenced at the step of nitrate reduction when the substrate-to-enzyme ratio was high (possibly saturating for the active sites of the nitrate reductase enzyme), for instance in young seedlings having a low nitrate reductase activity or in seedlings grown on high nitrate concentration.When the substrate concentration was low (and, hence, the active sites of the enzyme were possibly not saturated), the isotopic discrimination could only be associated with the uptake of nitrate into the cell. In that case, isotopic fractionation was null. It is concluded that the uptake of nitrate does not discriminate among nitrogen isotopes.
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Citations
Cited by
N2-Fixation in Field Settings: Estimations Based on Natural 15N Abundance
Shearer, G., & Kohl, D. (1986) · Australian Journal of Plant Physiology · doi:10.1071/pp9860699 · Cited by 1,082
Physiological mechanisms influencing plant nitrogen isotope composition
Evans, R. D. (2001) · Trends in Plant Science · doi:10.1016/s1360-1385(01)01889-1 · Cited by 852
Denitrifying bioreactors—an approach for reducing nitrate loads to receiving waters
Schipper, L. A., Robertson, W. D., Gold, A. J., Jaynes, D. B., & Cameron, S. C. (2010) · Ecological Engineering · doi:10.1016/j.ecoleng.2010.04.008 · Cited by 573
“In contrast, mmobilisation of NO3− into organic pools does not discriminate etween isotopes (Mariotti et al., 1982).”
BackgroundMariotti, A., Landreau, A., & Simon, B. (1988) · Geochimica et Cosmochimica Acta · doi:10.1016/0016-7037(88)90010-5 · Cited by 538
Self-citationGebauer, G., & Schulze, E. D. (1991) · Oecologia · doi:10.1007/bf00325257 · Cited by 351
Metadata
- Authors
- Mariotti, A., Mariotti, F., Champigny, M.-L., Amarger, N., & Moyse, A.
- Venue
- Plant Physiology
- Publisher
- Oxford University Press (OUP)
- Published
- 1982-04-01
- Volume
- 69
- Issue
- 4
- Pages
- 880-884
- ISSN
- 0032-0889 (ISSN-L)
- 1532-2548
- OpenAlex
- W2084800474
- Cited by
- 226
- References
- 0
- FWCI
- 2.76
- Type
- journal article
- Language
- en
- Open access
- bronze
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- CoChat. (2026). Citation check: Nitrogen Isotope Fractionation Associated with Nitrate Reductase Activity and Uptake of NO3− by Pearl Millet. https://app.cochat.ai/papers/10.1104/pp.69.4.880
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- Mariotti, A., Mariotti, F., Champigny, M.-L., Amarger, N., & Moyse, A. (1982). Nitrogen Isotope Fractionation Associated with Nitrate Reductase Activity and Uptake of NO3− by Pearl Millet. Plant Physiology. https://doi.org/10.1104/pp.69.4.880
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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
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