Effects of Some Hill Reaction-Inhibiting Herbicides on Nitrous Oxide Emission from Nitrogen-Input Farming Soil
| Autor: | Yasuyuki Hashidoko, Li Li, Yuta Takatsu, Sharon Yu Ling Lau |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
inorganic chemicals
denitrification inhibition Denitrification chemistry.chemical_element Andisol farmland soil Diquat lcsh:Technology lcsh:Chemistry 03 medical and health sciences chemistry.chemical_compound Denitrifying bacteria Bromacil General Materials Science Instrumentation lcsh:QH301-705.5 030304 developmental biology Fluid Flow and Transfer Processes 0303 health sciences 030306 microbiology lcsh:T Process Chemistry and Technology General Engineering Hill reaction Andisol equipment and supplies Nitrogen lcsh:QC1-999 electron-transport inhibiting herbicide Computer Science Applications chemistry lcsh:Biology (General) lcsh:QD1-999 lcsh:TA1-2040 Environmental chemistry N2O emission suppression Nitrification lcsh:Engineering (General). Civil engineering (General) lcsh:Physics Hill reaction inhibitors |
| Zdroj: | Applied Sciences Volume 9 Issue 9 Applied Sciences, Vol 9, Iss 9, p 1903 (2019) |
| ISSN: | 2076-3417 |
| DOI: | 10.3390/app9091903 |
| Popis: | Nitrous oxide (N2O) emission-suppressing activity of some electron-transport inhibitors of the Hill reaction system was investigated. The Hill reaction inhibitors&mdash paraquat, isouron, bromacil, diquat, and simazine&mdash all of which have been or are currently being used as herbicides in farming activity are expected to inhibit the electron-transporting pathways of nitrate respiration in denitrifying bacteria. Using N2O-emitting soil bed (5.0 g of fresh weight) from a continuously manured Andisol corn farmland in Hokkaido, Japan, which was autoclaved and further supplemented with an active N2O-emitter, Pseudomonas sp. 5CFM15-6D, and 1 mL of 100 mM NH4NO3 or (NH4)2SO4 solution as the sole nitrogen source (final concentration, 0.2 mM) in a 30 mL gas-chromatography vial, the effects of the five herbicides on N2O emission were examined. Paraquat and isouron (each at 50 µ M) showed a statistically significant suppression of N2O emission in both the nitrification and the denitrification processes after a 7-day-incubation, whereas diquat at the same concentration accelerated N2O emission in the presence of NO3&minus These results suggest that paraquat and isouron inhibited both the nitrification and the denitrification processes for N2O generation, or its upstream stages, whereas diquat specifically inhibited N2O reductase, an enzyme that catalyzes the reduction of N2O to N2 gas. Incomplete denitrifiers are the key players in the potent emission of N2O from Andisol corn farmland soil because of the missing nosZ gene. The electron relay system-inhibiting herbicides&mdash paraquat and isouron&mdash possibly contribute to the prevention of denitrification-induced nitrogen loss from the farming soil. |
| Databáze: | OpenAIRE |
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