A Novel Class of Gibberellin 2-Oxidases Control Semidwarfism, Tillering, and Root Development in Rice

We show that members of the rice GA2ox family are differentially regulated and act in concert or individually to control GA levels during flowering, tillering, and seed germination

Shuen-Fang Lo; Show-Ya Yang; Ku-Ting Chen; Yue-Ie Hsing; Jan A.D. Zeevaart; Liang-Jwu Chen; Su-May Yu


Scholarcy highlights

  • Gibberellins are a class of essential hormones controlling a variety of growth and developmental processes during the entire life cycle of plants
  • Mapping of GA2oxs in the rice genome sequence revealed that seven GA2oxs clustered on chromosomes 1 and 5 and others located on chromosomes 2, 4, and 7
  • Examination of expression of genes encoding enzymes involved in GA biosynthesis and catabolism provides an alternative approach for such studies
  • We showed that GA2oxs are differentially regulated during the rice life cycle, indicating that they act in concert or individually to control GA levels during rice development
  • Due to the complicated feedback regulatory network and temporal and spatial expression of GA2oxs and other enzymes involved in GA biosynthesis and catabolism, and the interaction between GA metabolism and response pathways, deciphering the regulatory mechanism of GA2ox expression by more extensive biochemical and genetic studies is required to better understand their exact functions during rice growth and development
  • A recent study showed that overexpression of the YABBY1 gene, a feedback regulator of GA biosynthesis, in transgenic rice leads to reduced GA level, increased tiller number, and a semidwarf phenotype, which provides a clue that GA might coordinately control the two opposite developmental processes
  • Our discoveries offer three different approaches for breeding plants with reduced height, increased root biomass, and normal flowering and seed production by overexpression of C20 GA2oxs

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