2006 Fiscal Year Final Research Report Summary
Plant growth regulation useful for plant production in arid environment
| Project/Area Number |
16380166
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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 |
Agricultural environmental engineering
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| Research Institution | Tohoku University |
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Principal Investigator |
TAKAHASHI Hideyuki Tohoku University, Graduate School of Life Sciences, Professor, 大学院生命科学研究科, 教授 (70179513)
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| Co-Investigator(Kenkyū-buntansha) |
FUJII Nobuharu Tohoku University, Graduate School of Life Sciences, Assistant Professor, 大学院生命科学研究科, 助教授 (70272002)
YUTAKA Miyazawa Tohoku University, Graduate School of Life Sciences, Research Associate, 大学院生命科学研究科, 助手 (00342858)
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| Project Period (FY) |
2004 – 2006
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| Keywords | Wheat / Arabidopsis / Hydrotropism / Auxin / MIZU-KUSSEI(MIZ) / Graviresponse / Internode elongation / Gibberellin |
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| Research Abstract |
We isolated seven Arabidopsis mutants (mizu-kussei : miz) defective in root hydrotropism. We characterized their phenotypes and identified genes responsible for the mutations of miz1 and miz6. Roots of both miz1 and miz6 showed impaired hydrotropism, but their gravitropism, elongation growth and morphological feature were normal. These results suggest that the pathway inducing hydrotropism is independent of gravitropism. MIZ1 phenotype resulted from a single recessive mutation, which encoded a novel protein containing a domain (the MIZ domain) that was highly conserved among terrestrial plants. We hypothesized that MIZ1 evolved to play an important role in adaptation to terrestrial life. In addition, a pMIZ1::GEIS fusion gene was strongly expressed in columella cells of the root cap but not in the elongation zone, suggesting that MIZ1 functions in the early phase of the hydrotropic response. We found that auxin response is indispensable for both hydrotropism and gravitropism, but mecha
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nisms for auxin redistribution differ between hydrotropism and gravitropism in Arabidopsis roots.
A variety of wheat, Hong Mang Mai, exhibits tolerance to deep-sowing conditions by extreme elongation of the first internodes in soil. To exert this response, the first internodes of Hong Mang Mai possessed greater ability to produce cells, compared to other varieties. It was revealed that gibberellin plays roles in both cell elongation and cell division of the internodes. However, extraordinary elongation of the first internodes of Hong Mang Mai occurred due to cell division rather than cell elongation. Based on these results, we are now studying molecular mechanisms for the deep-sowing tolerance of Hong Mang Mai.
Plants respond to gravity for controlling their growth orientation. We found that gravisensing is required for circumnutation and winding response in morning glory and that glycine-rich protein (CsGRP1) and auxin-mediated transcription (CsARF2 and CsARF5) play roles in the gravity regulation of peg formation in cucumber seedlings. Less
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[Journal Article] Shoot circumnutation and winding movements require gravisensing cells.2005
Author(s)
Kitazawa D, Hatakeda Y, Kamada M, Fujii N, Miyazawa Y, Hoshino A, Iida S, Fukaki H, Morita MT, Tasaka M, Suge H, Takahashi H
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Journal Title
Proceedings of the National Academy of Sciences of the United States of America(PNAS) 102
Pages: 18742-18747
Description
「研究成果報告書概要(欧文)」より
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