| Budget Amount *help |
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2015: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2014: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
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| Outline of Final Research Achievements |
Previously uncultured microorganisms Nitrospira which are also nitrite oxidizing microorganisms resist the cultivation of agar plates. Nitrospira are co-existing with heterotrophs in the enrichment culture. Growth of those heterotrophs are completely dependent on the organic compounds excreted from autotrophs as metabolic by-products. However, it is unclear whether the symbiotic relationships are commensal or mutualistic.
Then we screened 16 isolates of heterotrophs, co-cultured with and tested growth promoting activity on Nitrospira. The growth of Nitrospira was clearly stimulated by co-cultivation with 4 isolates, suggesting to have a benefit to be co-existing with each other. We next tested those isolates to identify whether the growth promoting on Nitrospira are derived from, 1) removal of inhibiting factor for Nitrospira or, 2) supply of growth promoting factor. The result suggested that heterotrophs provide unknown growth promoting factor to Nitrospira.
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