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Mitigation of soil N2O emission by inoculation with a mixed culture of indigenous Bradyrhizobium diazoefficiens
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Mitigation of soil N2O emission by inoculation with a mixed culture of indigenous Bradyrhizobium diazoefficiens
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Journal Article
Mitigation of soil N2O emission by inoculation with a mixed culture of indigenous Bradyrhizobium diazoefficiens
2016
Overview
Agricultural soil is the largest source of nitrous oxide (N
2
O), a greenhouse gas. Soybean is an important leguminous crop worldwide. Soybean hosts symbiotic nitrogen-fixing soil bacteria (rhizobia) in root nodules. In soybean ecosystems, N
2
O emissions often increase during decomposition of the root nodules. Our previous study showed that N
2
O reductase can be used to mitigate N
2
O emission from soybean fields during nodule decomposition by inoculation with
nosZ
++ strains [mutants with increased N
2
O reductase (N
2
OR) activity] of
Bradyrhizobium diazoefficiens
. Here, we show that N
2
O emission can be reduced at the field scale by inoculation with a mixed culture of indigenous
nosZ
+ strains of
B. diazoefficiens
USDA110 group isolated from Japanese agricultural fields. Our results also suggested that nodule nitrogen is the main source of N
2
O production during nodule decomposition. Isolating
nosZ
+ strains from local soybean fields would be more applicable and feasible for many soybean-producing countries than generating mutants.
Publisher
Nature Publishing Group UK,Nature Publishing Group
