A Small Subfamily of Arabidopsis RADIALIS-LIKE SANT/MYB Genes: A Link to HOOKLESS1-Mediated Signal Transduction during Early Morphogenesis

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概要

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• More than 1,600 genes encoding transcription factors have been identified in the Arabidopsis genome sequence, but their physiological functions are not yet fully understood. In this study, a small subfamily of single-MYB transcription factor genes, designated RSM1, RSM2, RSM3 and RSM4 (RADIALIS-LIKE SANT/MYB 1-4), was characterized. Here, we mainly examined the RSM1 gene, and found that it appears to play a role in close connection with the HLS1 (HOOKLESS 1) gene during early morphogenesis. Etiolated seedlings overexpressing RSM1 showed several phenotypes similar to those of hls1-1, viz., lack of apical hooks with short hypocotyls, and a defect in gravitropism. Furthermore, both RSM1-ox and hls1-1 seedlings were hypersensitive to red light during early photomorphogenesis, displaying shorter hypocotyls than wild-type seedlings. The histochemical profile of the DR5::GUS auxin-reporter in the RMS1-ox seedlings was considerably different from that in the wild-type seedlings. These results are discussed in the context of the possibility that RSM1 is implicated in HLS1-mediated auxin signaling, which is responsible for regulation of the early photomorphogenesis of Arabidopsis thaliana.

• 社団法人 日本農芸化学会の論文

著者

• YAMASHINO Takafumi

  Laboratory of Molecular Microbiology, School of Agriculture, Nagoya University

• MIZUNO Takeshi

  Laboratory of Molecular Microbiology, School of Agriculture, Nagoya University

• Kiba Takatoshi

  Laboratory of Molecular Microbiology, School of Agriculture, Nagoya University

• KOIZUMI Nobuya

  Laboratory of Molecular Microbiology, School of Agriculture, Nagoya University

• KOJIMA Mikiko

  RIKEN Plant Science Center

• SAKAKIBARA Hitoshi

  RIKEN Plant Science Center

• Yamashino Takafumi

  Nagoya Univ. Nagoya Jpn

• HAMAGUCHI Aya

  Laboratory of Molecular Microbiology, School of Agriculture, Nagoya University

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