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

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)817-828
Number of pages12
JournalPlant Molecular Biology
Issue number4-5
Publication statusPublished - Jul 2006
Externally publishedYes


  • Arabidopsis
  • Cell elongation
  • CUE domain
  • Endoreduplication
  • IPD1
  • Light control

Field of Science*

  • 1.6 Biological sciences

Publication Type*

  • 1.1. Scientific article indexed in Web of Science and/or Scopus database


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