Identification of An7 as a positive awn regulator from two wild rice species

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  • Mizutani Miya
    Bioscience and Biotechnology Center, Nagoya University Present address: Division of Biological Science, Nara Institute of Science and Technology
  • Murase Riri
    Graduate School of Bioagricultural Sciences, Nagoya University
  • Aoki Shin-ichiro
    Graduate School of Bioagricultural Sciences, Nagoya University
  • Sato Yutaka
    National Institute of Genetics
  • Yamagata Yoshiyuki
    Plant Breeding Laboratory, Faculty of Agriculture, Kyushu University
  • Yasui Hideshi
    Plant Breeding Laboratory, Faculty of Agriculture, Kyushu University
  • Yoshimura Atsushi
    Plant Breeding Laboratory, Faculty of Agriculture, Kyushu University
  • Ashikari Motoyuki
    Bioscience and Biotechnology Center, Nagoya University Graduate School of Bioagricultural Sciences, Nagoya University
  • Bessho-Uehara Kanako
    Graduate School of Life Sciences, Tohoku University

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  • Identification of <i>An7</i> as a positive awn regulator from two wild rice species

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<p>The awn is a bristle-like appendage that protrudes from the seed tip and plays a critical role in preventing feed damage and spreading habitats in many grass species, including rice. While all wild species in the Oryza genus have awns, this trait has been eliminated in domesticated species due to its obstructive nature to agricultural processes. To date, several genes involved in awn development have been identified in wild rice, Oryza rufipogon and Oryza barthii which are ancestral species of cultivated rice in Asia and Africa, respectively. However, the responsible genes for awn development have not been identified in other wild rice species even though multiple QTLs have been reported previously. In this study, we identified An7 gene responsible for awn development in two wild rice species, Oryza glumaepatula and Oryza meridionalis. An7 encodes a cytochrome P450 enzyme and is homologous to D2/CYP90D2, a known brassinosteroid biosynthesis enzyme in rice. The identification of An7 provides insight into a distinct molecular mechanism underlying awn development that occurs in geographically separated environments.</p>

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