| Budget Amount *help |
¥15,990,000 (Direct Cost: ¥12,300,000、Indirect Cost: ¥3,690,000)
Fiscal Year 2020: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2019: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2018: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2017: ¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
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| Outline of Final Research Achievements |
Iron toxicity in rice caused by higher contents of ferrous iron generated under anoxic conditions brings about severe deterioration of paddy rice production in some areas of the tropics. This research project focused on the microorganisms involved in the redox cycle of iron in the rhizosphere of rice under iron toxic conditions. Microbial community structures of iron reducers and oxidizers were investigated in the bulk and rhizosphere soil and root samples of rice plants with and without the symptoms of iron toxicity in an iron-toxic paddy field in the Kou valley, Burkina Faso, West Africa. The characteristics of the communities of iron reducers and oxidizers were compared with those in a paddy field in Japan without iron toxicity. Irrespective of the symptoms of iron toxicity in rice, a clear predominance of iron reducers over iron oxidizers was revealed in the rice rhizosphere in the iron-toxic paddy field, which corresponded well to the higher contents of ferrous iron in the soil.
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