ARR1, a transcription factor for genes immediately responsive to cytokinins

H. Sakai, T. Honma, A. Takashi, S. Sato, T. Kato, S. Tabata, A. Oka

Research output: Contribution to journalArticlepeer-review

387 Citations (Scopus)


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-over-expressing plants and arr1 mutant plants, indicates that the phosphorelay to ARR1, probably from CRE1, constitutes an intracelular signal transduction occurring immediately after cytokinin perception.

Original languageEnglish
Pages (from-to)1519-1521
Number of pages3
Issue number5546
Publication statusPublished - 2001 Nov 16


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