Organ fusion and defective shoot development in oni3 mutants of rice

Takafumi Akiba, Ken Ichiro Hibara, Fumiko Kimura, Katsutoshi Tsuda, Kiko Shibata, Mayu Ishibashi, Chihiro Moriya, Kiyotaka Nakagawa, Nori Kurata, Jun Ichi Itoh, Yukihiro Ito

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)


Maintenance of organ separation is one of the essential phenomena for normal plant development. We have identified and analyzed ONION3 (ONI3), which is required for avoiding organ fusions in rice. Loss-of-function mutations of ONI3, which were identified as mutants with ectopic expression of KNOX genes in leaves and morphologically resembling KNOX overexpressors, showed abnormal organ fusions in developing shoots. The mutant seedlings showed fusions between neighboring organs and also within an organ; they stopped growing soon after germination and subsequently died. ONI3 was shown to encode an enzyme that is most similar to Arabidopsis HOTHEAD and is involved in biosynthesis of long-chain fatty acids. Expression analyses showed that ONI3 was specifically expressed in the outermost cell layer in the shoot apex throughout life cycle, and the oni3 mutants had an aberrant outermost cell layer. Our results together with previous studies suggest that long-chain fatty acids are required for avoiding organ fusions and promoting normal shoot development in rice.

Original languageEnglish
Pages (from-to)42-51
Number of pages10
JournalPlant and Cell Physiology
Issue number1
Publication statusPublished - 2014 Jan


  • Epidermis
  • Long-chain fatty acid
  • Organ fusion
  • Rice
  • Shoot
  • Very-long-chain fatty acid

ASJC Scopus subject areas

  • Physiology
  • Plant Science
  • Cell Biology


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