ABERRANT PANICLE ORGANIZATION 2/RFL, the rice ortholog of Arabidopsis LEAFY, suppresses the transition from inflorescence meristem to floral meristem through interaction with APO1

Kyoko Ikeda-Kawakatsu, Masahiko Maekawa, Takeshi Izawa, Jun Ichi Itoh, Yasuo Nagato

Research output: Contribution to journalArticlepeer-review

99 Citations (Scopus)

Abstract

The temporal and spatial control of meristem identity is a key element in plant development. To better understand the molecular mechanisms that regulate inflorescence and flower architecture, we characterized the rice aberrant panicle organization 2 (apo2) mutant which exhibits small panicles with reduced number of primary branches due to the precocious formation of spikelet meristems. The apo2 mutants also display a shortened plastochron in the vegetative phase, late flowering, aberrant floral organ identities and loss of floral meristem determinacy. Map-based cloning revealed that APO2 is identical to previously reported RFL gene, the rice ortholog of the Arabidopsis LEAFY (LFY) gene. Further analysis indicated that APO2/RFL and APO1, the rice ortholog of Arabidopsis UNUSUAL FLORAL ORGANS, act cooperatively to control inflorescence and flower development. The present study revealed functional differences between APO2/RFL and LFY. In particular, APO2/RFL and LFY act oppositely on inflorescence development. Therefore, the genetic mechanisms for controlling inflorescence architecture have evolutionarily diverged between rice (monocots) and Arabidopsis (eudicots).

Original languageEnglish
Pages (from-to)168-180
Number of pages13
JournalPlant Journal
Volume69
Issue number1
DOIs
Publication statusPublished - Jan 2012

Keywords

  • APO1
  • APO2
  • LFY
  • flower
  • inflorescence
  • plastochron
  • rice

ASJC Scopus subject areas

  • Genetics
  • Plant Science
  • Cell Biology

Fingerprint Dive into the research topics of 'ABERRANT PANICLE ORGANIZATION 2/RFL, the rice ortholog of Arabidopsis LEAFY, suppresses the transition from inflorescence meristem to floral meristem through interaction with APO1'. Together they form a unique fingerprint.

Cite this