Phytochrome dependent quantitative control of Hd3a transcription is the basis of the night break effect in rice flowering

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概要

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• A short exposure to light during relative night (night break; NB) delays flowering in the short day plant rice. NB acts by downregulating Heading date 3a (Hd3a) expression. Because phytochrome B mutants do not respond to NB and their flowering time is not affected even under NB conditions, phyB is required for the suppression of Hd3a expression. The effect of NB is quantitatively controlled by light quality and by either light intensity or duration. However, the molecular mechanisms that regulate these interactions are poorly understood. Here, we examine the roles of phytochromes in the regulation of Hd3a transcription under NB conditions using monochromatic red, far-red and blue light. Red and blue light downregulated Hd3a expression, but far-red light NB did not. The effect of red light NB on Hd3a is dependent on photon fluence and is restored by subsequent far-red light irradiation. Our results suggest that quantitative effect of light on flowering in rice NB is mediated by the regulation of Hd3a transcription by phyB.

• 2009-04-25

著者

• Takano Makoto

  Division of Molecular Physiology and Biophysics, Department of Physiology, Jichi Medical University

• 篠村 知子

  (株)日立製作所 中央研究所

• 篠村 知子

  日立製作所・基礎研究所

• SHIMAMOTO Ko

  Laboratory of Plant Molecular Genetics, Nara Institute of Science and Technology

• SHINOMURA Tomoko

  Hitachi Adv. Res. Lab, Saitama

• Takano Makoto

  Division Of Biophysics Department Of Physiology Jichii Medical School

• ISHIKAWA Ryo

  Laboratory of Plant Molecular Genetics, Nara Institute of Science and Technology

• Shimamoto Ko

  Laboratory For Plant Molecular Genetics Nara Institute Of Science And Technology

• Ishikawa Ryo

  Laboratory Of Plant Molecular Genetics Nara Institute Of Science And Technology

• Takano Makoto

  Division Of Plant Sciences National Institute Of Agrobiological Sciences

• Shimamoto Ko

  Lab. Of Plant Molecular Genetics Nara Inst. Of Sci. And Technol.

• Ishikawa Ryo

  Laboratory Of Plant Breeding Graduate School Of Agricultural Science Kobe University

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