Gibberellin biosynthesis and signal transduction is essential for internode elongation in deepwater rice

Madoka Ayano, Takahiro Kani, Mikiko Kojima, Hitoshi Sakakibara, Takuya Kitaoka, Takeshi Kuroha, Rosalyn B. Angeles-Shim, Hidemi Kitano, Keisuke Nagai, Motoyuki Ashikari

    Research output: Contribution to journalArticle

    45 Citations (Scopus)

    Abstract

    Under flooded conditions, the leaves and internodes of deepwater rice can elongate above the water surface to capture oxygen and prevent drowning. Our previous studies showed that three major quantitative trait loci (QTL) regulate deepwater-dependent internode elongation in deepwater rice. In this study, we investigated the age-dependent internode elongation in deepwater rice. We also investigated the relationship between deepwater-dependent internode elongation and the phytohormone gibberellin (GA) by physiological and genetic approach using a QTL pyramiding line (NIL-1+3+12). Deepwater rice did not show internode elongation before the sixth leaf stage under deepwater condition. Additionally, deepwater-dependent internode elongation occurred on the sixth and seventh internodes during the sixth leaf stage. These results indicate that deepwater rice could not start internode elongation until the sixth leaf stage. Ultra-performance liquid chromatography tandem mass-spectrometry (UPLC-MS/MS) method for the phytohormone contents showed a deepwater-dependent GA1 and GA4 accumulation in deepwater rice. Additionally, a GA inhibitor abolished deepwater-dependent internode elongation in deepwater rice. On the contrary, GA feeding mimicked internode elongation under ordinary growth conditions. However, mutations in GA biosynthesis and signal transduction genes blocked deepwater-dependent internode elongation. These data suggested that GA biosynthesis and signal transduction are essential for deepwater-dependent internode elongation in deepwater rice.

    Original languageEnglish
    Pages (from-to)2313-2324
    Number of pages12
    JournalPlant, Cell and Environment
    Volume37
    Issue number10
    DOIs
    Publication statusPublished - 2014 Oct 1

    Keywords

    • Gibberellin

    ASJC Scopus subject areas

    • Physiology
    • Plant Science

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  • Cite this

    Ayano, M., Kani, T., Kojima, M., Sakakibara, H., Kitaoka, T., Kuroha, T., Angeles-Shim, R. B., Kitano, H., Nagai, K., & Ashikari, M. (2014). Gibberellin biosynthesis and signal transduction is essential for internode elongation in deepwater rice. Plant, Cell and Environment, 37(10), 2313-2324. https://doi.org/10.1111/pce.12377