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Plant Molecular Biology

, Volume 61, Issue 4–5, pp 817–828 | Cite as

Light-dependent polyploidy control by a CUE protein variant in Arabidopsis

  • Yuko Tsumoto
  • Takeshi Yoshizumi
  • Hirofumi Kuroda
  • Mika Kawashima
  • Takanari Ichikawa
  • Miki Nakazawa
  • Naoki Yamamoto
  • Minami Matsui
Article

Abstract

Endoreduplication is a special cell cycle that increases ploidy without cell and nuclear division. In plants endoreduplication is essential for development. We isolated a dominant Arabidopsis mutant from activation tagging lines that had increased polyploidy in darkness. This mutant, ipd1-1D (increased polyploidy level in darkness 1-1D), shows longer hypocotyls and increased ploidy levels only in dark-grown seedlings. The corresponding gene encodes a protein that contains a CUE domain variant. IPD1 is specifically expressed in mitotically dividing cells. Furthermore we show that blue and far-red light can suppress the ploidy increase in ipd1-1D and also suppress the reporter expression in IPD1-promoter β-glucuronidase transgenic plants. These results suggest that IPD1 regulates the endocycle leading to hypocotyl elongation and this function is controlled by blue and far-red light.

Keywords

Arabidopsis Cell elongation CUE domain Endoreduplication IPD1 Light control 

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Copyright information

© Springer Science+Business Media B.V. 2006

Authors and Affiliations

  • Yuko Tsumoto
    • 1
    • 2
  • Takeshi Yoshizumi
    • 2
  • Hirofumi Kuroda
    • 2
  • Mika Kawashima
    • 2
  • Takanari Ichikawa
    • 2
  • Miki Nakazawa
    • 2
  • Naoki Yamamoto
    • 1
  • Minami Matsui
    • 2
  1. 1.Graduate School of Humanities and Science Ochanomizu UniversityTokyoJapan
  2. 2.Plant Functional Genomics Research Team, Functional Genomics Research Group, Genomic Sciences CenterRIKEN Yokohama InstituteKanagawaJapan

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