Rice ABERRANT PANICLE ORGANIZATION 1, encoding an F-box protein, regulates meristem fate

Kyoko Ikeda, Momoyo Ito, Nobuhiro Nagasawa, Junko Kyozuka, Yasuo Nagato

Research output: Contribution to journalArticle

151 Citations (Scopus)

Abstract

Inflorescence architecture is one of the most important agronomical traits. Characterization of rice aberrant panicle organization 1 (apo1) mutants revealed that APO1 positively controls spikelet number by suppressing the precocious conversion of inflorescence meristems to spikelet meristems. In addition, APO1 is associated with the regulation of the plastchron, floral organ identity, and floral determinacy. Phenotypic analyses of apo1 and floral homeotic double mutants demonstrate that APO1 positively regulates class-C floral homeotic genes, but not class-B genes. Molecular studies revealed that APO1 encodes an F-box protein, an ortholog of Arabidopsis UNUSUAL FLORAL ORGAN (UFO), which is a positive regulator of class-B genes. Overexpression of APO1 caused an increase in inflorescence branches and spikelets. As the mutant inflorescences and flowers differed considerably between apo1 and ufo, the functions of APO1 and UFO appear to have diverged during evolution.

Original languageEnglish
Pages (from-to)1030-1040
Number of pages11
JournalPlant Journal
Volume51
Issue number6
DOIs
Publication statusPublished - 2007 Sep 1
Externally publishedYes

Keywords

  • ABERRANT PANICLE ORGANIZATION 1
  • F-box protein
  • Floral organ identity
  • Inflorescence
  • Rice
  • UNUSUAL FLORAL ORGAN

ASJC Scopus subject areas

  • Genetics
  • Plant Science
  • Cell Biology

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