| Project/Area Number |
17570041
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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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・分子
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| Research Institution | Tokyo Metropolitan University |
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Principal Investigator |
KANEGAE Takeshi Tokyo Metropolitan University, Department of biological sciences, Assistant professor, 理工学研究科, 助手 (70264588)
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| Project Period (FY) |
2005 – 2006
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| Project Status |
Completed (Fiscal Year 2006)
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| Budget Amount *help |
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2006: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2005: ¥2,800,000 (Direct Cost: ¥2,800,000)
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| Keywords | plant / development / differentiation / photoreceptor / signal transduction / environmental response / フィトクロム / フォトトロピン |
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| Research Abstract |
Phytochrome 3 (PHY3) is a red-light receptor found in some ferns, which preferentially grow under weak light conditions. Based on its predicted domain organization, fern PHY3 looks like a chimeric protein consists of both red・and blue-light photoreceptors. N-terminal half of PHY3 contains a chromophore-binding domain of phytochrome and its C-terminal half shows a remarkable similarity to phototropin, containing two LOV domains and a Ser/Thr kinase domain. To study functions of PHY3 polypeptide, we introduced CaMV 35S promoter driven Adiantum PHY3 gene into Arabidopsis phot1-5 phot2-1 plant and observed the phototropic responses. Here we report that PHY3 acts as a dual-channel photoreceptor with both the red-light sensing system of phytochrome and the blue-light sensing system of phototropin. Although these sensing-systems usually reside in independent photoreceptors, these two different light-sensing systems cooperate and generate a synergistic effect within PHY3 molecule, and consequently confer the enhanced light-sensitivity on PHY3.
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