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Science 294 (5546): 1519-1521

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

ARR1, a Transcription Factor for Genes Immediately Responsive to Cytokinins

Hiroe Sakai,1* Takashi Honma,1dagger Takashi Aoyama,1 Shusei Sato,2 Tomohiko Kato,2 Satoshi Tabata,2 Atsuhiro Oka1ddagger

Cytokinins are a class of phytohormones involved in various physiological events of plants. The Arabidopsis sensor histidine kinase CRE1 was recently reported to be a cytokinin receptor. We used a steroid-inducible system to show that the transcription factor-type response regulator ARR1 directs transcriptional activation of the ARR6 gene, which responds to cytokinins without de novo protein synthesis. This fact, together with characteristics of ARR1-overexpressing plants and arr1 mutant plants, indicates that the phosphorelay to ARR1, probably from CRE1, constitutes an intracellular signal transduction occurring immediately after cytokinin perception.

1 Laboratory of Molecular Biology, Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan.
2 Kazusa DNA Research Institute, Kisarazu, Chiba 292-0812, Japan
*   These authors contributed equally to this work.

dagger    Deceased 14 July 2001.

ddagger    To whom correspondence should be addressed. E-mail: oka{at}scl.kyoto-u.ac.jp


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