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doi: 10.1242/10.1242/dev.00111

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Development 129, 5409-5419 (2002)
Copyright © 2002 The Company of Biologists Limited

Role of a positive regulator of root hair development, CAPRICE, in Arabidopsis root epidermal cell differentiation

Takuji Wada1, Tetsuya Kurata1, Rumi Tominaga1, Yoshihiro Koshino-Kimura1,2, Tatsuhiko Tachibana2,*, Koji Goto3, M. David Marks4, Yoshiro Shimura5 and Kiyotaka Okada1,2,{dagger}

1 Plant Science Center, RIKEN, 1-7-22 Suehiro-cho, Tsurumi-Ku, Yokohama, Kanagawa 230-0045, Japan
2 Department of Botany, Graduate School of Science, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan
3 Research Institute for Biological Science, Kayo-cho, Jobo, Okayama 716-1241, Japan
4 Department of Genetics and Cell Biology, University of Minnesota, St. Paul, MN 55108-1095, USA
5 Biomolecular Engineering Research Institute, 6-2-3 Furuedai, Suita, Osaka 565-0874, Japan
* Present address: Chugai Pharmaceutical Co. Ltd., 1-135 Komakado, Gotemba, Shizuoka 412-8513, Japan

{dagger} Author for correspondence (e-mail: kiyo{at}ok-lab.bot.kyoto-u.ac.jp)

Accepted 26 August 2002

In Arabidopsis, root hairs are formed only from a set of epidermal cells named trichoblasts or hair-forming cells. Previous studies showed CAPRICE (CPC) promotes differentiation of hair-forming cells by controlling a negative regulator, GLABRA2 (GL2), which is preferentially expressed in hairless cells. Here, we show that CPC is also predominantly expressed in the hairless cells, but not in the neighboring hair-forming cells, and that CPC protein moves to the hair-forming cells and represses the GL2 expression. We also show that the N terminus of bHLH protein interacts with CPC and is responsible for the GL2 expression. We propose a model in which CPC plays a key role in the fate-determination of hair-forming cells.

Key words: Arabidiopsis, CAPRICE, Myb, bHLH, Root hair, Transcriptional regulation, Epidermis, Protein movement




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© The Company of Biologists Ltd 2002