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Science 291 (5511): 2138-2141

Copyright © 2001 by the American Association for the Advancement of Science

Arabidopsis NPL1: A Phototropin Homolog Controlling the Chloroplast High-Light Avoidance Response

Takatoshi Kagawa,12* Tatsuya Sakai,3* Noriyuki Suetsugu,4 Kazusato Oikawa,4 Sumie Ishiguro,3 Tomohiko Kato,5 Satoshi Tabata,5 Kiyotaka Okada,36 Masamitsu Wada24dagger

Chloroplasts relocate their positions in a cell in response to the intensity of incident light, moving to the side wall of the cell to avoid strong light, but gathering at the front face under weak light to maximize light interception. Here, Arabidopsis thaliana mutants defective in the avoidance response were isolated, and the mutated gene was identified as NPL1 (NPH-like 1), a homolog of NPH1 (nonphototropic hypocotyl 1), a blue light receptor used in phototropism. Hence, NPL1 is likely a blue light receptor regulating the avoidance response under strong light.

1 "Unit Process and Combined Circuit," PRESTO, Japan Science and Technology Corporation, 1-8, Honcho 4-chome, Kawaguchi-city, Saitama 332-0012, Japan.
2 Division of Biological Regulation and Photobiology, National Institute for Basic Biology, Okazaki 444-8585, Japan.
3 RIKEN Plant Science Center, Kyoto 606-8502, Japan.
4 Department of Biological Sciences, Graduate School of Science, Tokyo Metropolitan University, Tokyo 192-0397, Japan.
5 Kazusa DNA Research Institute, Kisarazu, Chiba 292-0812, Japan.
6 Department of Botany, Graduate School. of Science, Kyoto University, Kyoto 606-8502, Japan
*   These authors contributed equally to this work.

dagger    To whom correspondence should be addressed. E-mail: wada-masamitsu{at}

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   Abstract »    Full Text »    PDF »

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