Rice gibberellin-insensitive gene homolog, OsGAI, encodes a nuclear-localized protein capable of gene activation at transcriptional level

M. Ogawa, T. Kusano, M. Katsumi, H. Sano

    Research output: Contribution to journalArticle

    88 Citations (Scopus)

    Abstract

    This paper reports isolation and properties of a rice gene, OsGAI, a putative homolog of the GAI of Arabidopsis thaliana. OsGAI encodes a polypeptide of 625 amino acids, which shows 53-55% identity to GAI and RGA from A. thaliana, and 85% identity to wheat rht-D1a and maize d8. Genomic DNA blot analysis indicated the OsGAI to be a single-copy gene in the rice genome. RNA blot hybridization showed that OsGAI transcripts increased within 6 h upon GA 3 but not ABA application. This GA-induced increment in OsGAI transcripts did not require de novo protein synthesis. High levels of OsGAI transcripts were detected in nodes, internodes, leaf sheaths and ears of adult plants and leaf sheaths of young seedlings, where GA enhances cell elongation and division. Transiently expressed OsGAI-GFP fusion protein located to the nucleus in onion epidermal cells. Transactivation assays clearly indicated that OsGAI protein is a transcriptional activator or a coactivator. (C) 2000 Elsevier Science B.V. All rights reserved.

    Original languageEnglish
    Pages (from-to)21-29
    Number of pages9
    JournalGene
    Volume245
    Issue number1
    DOIs
    Publication statusPublished - 2000 Mar 7

    Keywords

    • GAI
    • Gibberellin
    • Oryza sativa
    • Transactivation
    • VHIID

    ASJC Scopus subject areas

    • Genetics

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