Does the brassinosteroid signal pathway in photomorphogenesis overlap with the gravitropic response caused by auxin?
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- Naiyanate Jaroensanti
- Department of Applied Biological Chemistry, The University of Tokyo, Tokyo, Japan
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- Jung-Min Yoon
- Department of Applied Biological Chemistry, The University of Tokyo, Tokyo, Japan
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- Yuji Nakai
- Department of Applied Biological Chemistry, The University of Tokyo, Tokyo, Japan
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- Ikuya Shirai
- Department of Applied Biological Chemistry, The University of Tokyo, Tokyo, Japan
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- Masato Otani
- Department of Applied Biological Chemistry, The University of Tokyo, Tokyo, Japan
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- Seung-Hyun Park
- Department of Applied Biological Chemistry, The University of Tokyo, Tokyo, Japan
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- Ken-ichiro Hayashi
- Faculty of Science, Department of Biochemistry, Okayama University of Science, Okayama, Japan
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- Masatoshi Nakajima
- Department of Applied Biological Chemistry, The University of Tokyo, Tokyo, Japan
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- Tadao Asami
- Department of Applied Biological Chemistry, The University of Tokyo, Tokyo, Japan
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説明
<jats:title>Abstract</jats:title><jats:p>Brassinosteroid (BR) and auxin co-regulate plant growth in a process termed cross-talking. Based on the assumption that their signal transductions are partially shared, inhibitory chemicals for both signal transductions were screened from a commercially available library. A chemical designated as NJ15 (ethyl 2-[5-(3,5-dichlorophenyl)-1,2,3,4-tetrazole-2-yl]acetate) diminished the growth promotion of both adzuki bean epicotyls and Arabidopsis seedlings, by the application of either BR or auxin. To understand its target site(s), bioassays with a high dependence on the signal transduction of either BR (BR-signaling) or auxin (AX-signaling) were performed. NJ15 inhibited the photomorphogenesis of Arabidopsis seedlings grown in the dark, which mainly depends on BR-signaling, while NJ15 also inhibited their gravitropic responses mainly depending on AX-signaling. On the study for the structure–activity relationships of NJ15 analogs, they showed strong correlations on the inhibitory profiles between BR- and AX-signalings. These correlations imply that NJ15 targets the downstream pathway after the integration of BR- and AX-signals.</jats:p>
収録刊行物
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- Bioscience, Biotechnology, and Biochemistry
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Bioscience, Biotechnology, and Biochemistry 78 (11), 1839-1849, 2014-11-02
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