| Budget Amount *help |
¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
Fiscal Year 2014: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2013: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2012: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
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| Outline of Final Research Achievements |
Nitrogen is an essential macronutrient required in quantity for plant growth and productivity. Rice grown in flooded paddy fields chiefly takes up and uses an inorganic form of soil ammonium as an external nitrogen source; however, a sole supply of ammonium at high concentration frequently causes toxic effects to many terrestrial plants. Down-modulation of the high-affinity transport system for ammonium uptake into plant roots in response to an increasing ammonium supply is important for preventing ammonium-toxicity in plants. In this study, a protein kinase OsACTPK1 was suggested to be involved in negative modulation of ammonium transport activity of plasma membrane proteins associated with ammonium uptake in rice roots in response to an ascending external ammonium and possibly to internal carbon availability. This finding will provide a cue for better understanding of molecular mechanisms for preventing excess ammonium uptake into roots.
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