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

    114 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

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