Antagonistic regulation of the gibberellic acid response during stem growth in rice

Keisuke Nagai, Yoshinao Mori, Shin Ishikawa, Tomoyuki Furuta, Rico Gamuyao, Yoko Niimi, Tokunori Hobo, Moyuri Fukuda, Mikiko Kojima, Yumiko Takebayashi, Atsushi Fukushima, Yasuyo Himuro, Masatomo Kobayashi, Wataru Ackley, Hiroshi Hisano, Kazuhiro Sato, Aya Yoshida, Jianzhong Wu, Hitoshi Sakakibara, Yutaka Sato, Hiroyuki Tsuji, Takashi Akagi and Motoyuki Ashikari ()
Additional contact information
Keisuke Nagai: Nagoya University
Yoshinao Mori: Nagoya University
Shin Ishikawa: Nagoya University
Tomoyuki Furuta: Nagoya University
Rico Gamuyao: Nagoya University
Yoko Niimi: Nagoya University
Tokunori Hobo: Nagoya University
Moyuri Fukuda: Nagoya University
Mikiko Kojima: RIKEN Center for Sustainable Resource Science
Yumiko Takebayashi: RIKEN Center for Sustainable Resource Science
Atsushi Fukushima: RIKEN Center for Sustainable Resource Science
Yasuyo Himuro: RIKEN Center for Sustainable Resource Science
Masatomo Kobayashi: RIKEN BioResource Research Center
Wataru Ackley: Institute of Livestock and Grassland Science, NARO
Hiroshi Hisano: Okayama University
Kazuhiro Sato: Okayama University
Aya Yoshida: Yokohama City University
Jianzhong Wu: Institute of Crop Science, NARO
Hitoshi Sakakibara: Nagoya University
Yutaka Sato: National Institute of Genetics
Hiroyuki Tsuji: Yokohama City University
Takashi Akagi: Okayama University
Motoyuki Ashikari: Nagoya University

Nature, 2020, vol. 584, issue 7819, 109-114

Abstract: Abstract The size of plants is largely determined by growth of the stem. Stem elongation is stimulated by gibberellic acid1–3. Here we show that internode stem elongation in rice is regulated antagonistically by an ‘accelerator’ and a ‘decelerator’ in concert with gibberellic acid. Expression of a gene we name ACCELERATOR OF INTERNODE ELONGATION 1 (ACE1), which encodes a protein of unknown function, confers cells of the intercalary meristematic region with the competence for cell division, leading to internode elongation in the presence of gibberellic acid. By contrast, upregulation of DECELERATOR OF INTERNODE ELONGATION 1 (DEC1), which encodes a zinc-finger transcription factor, suppresses internode elongation, whereas downregulation of DEC1 allows internode elongation. We also show that the mechanism of internode elongation that is mediated by ACE1 and DEC1 is conserved in the Gramineae family. Furthermore, an analysis of genetic diversity suggests that mutations in ACE1 and DEC1 have historically contributed to the selection of shorter plants in domesticated populations of rice to increase their resistance to lodging, and of taller plants in wild species of rice for adaptation to growth in deep water. Our identification of these antagonistic regulatory factors enhances our understanding of the gibberellic acid response as an additional mechanism that regulates internode elongation and environmental fitness, beyond biosynthesis and gibberellic acid signal transduction.

Date: 2020
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DOI: 10.1038/s41586-020-2501-8

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