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RPT2: A Signal Transducer of the Phototropic Response in Arabidopsis

Tatsuya Sakai, Takuji Wada, Sumie Ishiguro, Kiyotaka Okada
Tatsuya Sakai
Department of Botany, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan
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Takuji Wada
Department of Botany, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan
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Sumie Ishiguro
Department of Botany, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan
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Kiyotaka Okada
Department of Botany, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan
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  • For correspondence: kiyo@ok-lab.bot.kyoto-u.ac.jp

Published February 2000. DOI: https://doi.org/10.1105/tpc.12.2.225

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  • © 2000 American Society of Plant Physiologists

Abstract

The blue light receptor NPH1 (for nonphototropic hypocotyl) has been considered to be the only UV-A/blue light receptor that induces a phototropic response by the hypocotyl and root of Arabidopsis. By analysis of root phototropism (rpt) mutants, we show, however, the involvement of another blue light receptor as well as the existence of two separate signaling pathways working downstream of these receptors in the phototropic response. A newly isolated gene, RPT2, controls one of these pathways. The RPT2 gene is light inducible; encodes a novel protein with putative phosphorylation sites, a nuclear localization signal, a BTB/POZ domain, and a coiled-coil domain; and belongs to a large gene family that includes the recently isolated NPH3 gene. From genetic, physiological, and biochemical evidence, we propose a genetic model of the signaling pathways that induce the phototropic response in Arabidopsis.

  • Received September 28, 1999.
  • Accepted December 10, 1999.
  • Published February 1, 2000.
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RPT2: A Signal Transducer of the Phototropic Response in Arabidopsis
Tatsuya Sakai, Takuji Wada, Sumie Ishiguro, Kiyotaka Okada
The Plant Cell Feb 2000, 12 (2) 225-236; DOI: 10.1105/tpc.12.2.225

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RPT2: A Signal Transducer of the Phototropic Response in Arabidopsis
Tatsuya Sakai, Takuji Wada, Sumie Ishiguro, Kiyotaka Okada
The Plant Cell Feb 2000, 12 (2) 225-236; DOI: 10.1105/tpc.12.2.225
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The Plant Cell Online: 12 (2)
The Plant Cell
Vol. 12, Issue 2
Feb 2000
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