| Project/Area Number |
12440225
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
植物生理
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| Research Institution | Nara Women's University |
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Principal Investigator |
MIMURA Tetsuro NARA WOMEN'S UNIVERSITY, FACULTY OF SCIENCE, PROFESSOR, 理学部, 教授 (20174120)
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| Co-Investigator(Kenkyū-buntansha) |
TANAKA Yoshiyuki NATIONAL INSTITUTE OF AGROBIOLOGICAL SCIENCES, LABORATORY LEADER, 室長
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| Project Period (FY) |
2000 – 2002
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| Project Status |
Completed (Fiscal Year 2002)
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| Budget Amount *help |
¥13,400,000 (Direct Cost: ¥13,400,000)
Fiscal Year 2002: ¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2001: ¥4,000,000 (Direct Cost: ¥4,000,000)
Fiscal Year 2000: ¥5,800,000 (Direct Cost: ¥5,800,000)
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| Keywords | Cell membrane / Tonoplast / Characeae / Mangrove / Barley / Salt tolerance / Inorganic ion metabolism / Na^+ / H^+ antiporter / プロトンATPアーゼ / プロトンATPアーぜ / Na^+環境認識 / 液胞膜 / H^+アンチポーダー |
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| Research Abstract |
It is well known that Na^+ is not an essential element for most plants. Except for the salt tolerance, therewas almost no work on Na^+ metabolism, Na^+ transport in plant cells. Recently, we have found that Na^+ may play some important roles in plant life, too. In the present study, we focused roles of Na^+ in plant cell functions. We mainly investigated about Na^+ membrane transport systems, intracellular distribution of Na^+ and recognition of Na^+ environment by plant cells.
We have found that under Pi deficiency, Chara cells induced Na^+ driven Pi uptake system in the plasma membrane and its physiological transport mechanism was analyzed. Furthermore, we found that the induction of Na^+/Pi cotransport system absolutely needs the presence of extracellular Na^+. Second, under K^+ deficiency, we found that Na^+ is playing an important role for plant growth by being accumulated in the vacuole. Lastly, we found the vacuolar volume quickly increased when mangrove cells are exposed to the salt stress. In this phenomenon, Na^+ transport was partly mediated with the vesicle transport into the vacuole.
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