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Key message <p><b>This study shows that transcription factor </b><Emphasis Type="BoldItalic">G1</Emphasis><b> represses the floral development regulator </b><Emphasis Type="BoldItalic">OsMADS1</Emphasis><b> by binding to the CArG-box and YACTGTW motifs in </b><Emphasis Type="BoldItalic">OsMADS1</Emphasis><b>&#xa0;promoter to specify sterile lemma development in rice. In addition, we first demonstrate that G1 physically interacted with the OsMADS1 K-box domain, which enhances G1-mediated repression of </b><Emphasis Type="BoldItalic">OsMADS1</Emphasis><b>.</b></p> Abstract <p>Sterile lemma is a unique organ formation during the development of rice spikelet, and the regulatory mechanism underlying its development remains poorly understood. Previous studies showed that transcription factor <i>G1</i> (<i>Os07g0139300</i>) plays a critical role in sterile lemma development. Here, we further reveal that <i>G1</i> transcriptionally represses the expression of <i>OsMADS1</i>, a key gene regulating floral organ development in rice, by directly binding to the CArG box and YACTGTW motifs in its promoter. Importantly, we first demonstrate that G1 specifically targets the K-box domain of OsMADS1 to establish physical interaction, and the interaction significantly enhances G1-mediated transcriptional repression of <i>OsMADS1</i> expression. The feedback regulatory loop formed between <i>G1</i> and <i>OsMADS1</i> provides a key clue for further elucidating the molecular mechanisms underlying sterile lemma development.</p>

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G1-mediated OsMADS1 repression regulates sterile lemma development in rice

  • 期刊论文

  • 发表日期：

    2025年9月28日

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  • Xuemei Qin,
  • Jinliang Sun,
  • Ru Li,
  • Weijian Cen,
  • Rongbai Li,
  • Jijing Luo

摘要

Key message

This study shows that transcription factor G1 represses the floral development regulator OsMADS1 by binding to the CArG-box and YACTGTW motifs in OsMADS1 promoter to specify sterile lemma development in rice. In addition, we first demonstrate that G1 physically interacted with the OsMADS1 K-box domain, which enhances G1-mediated repression of OsMADS1.

Abstract

Sterile lemma is a unique organ formation during the development of rice spikelet, and the regulatory mechanism underlying its development remains poorly understood. Previous studies showed that transcription factor G1 (Os07g0139300) plays a critical role in sterile lemma development. Here, we further reveal that G1 transcriptionally represses the expression of OsMADS1, a key gene regulating floral organ development in rice, by directly binding to the CArG box and YACTGTW motifs in its promoter. Importantly, we first demonstrate that G1 specifically targets the K-box domain of OsMADS1 to establish physical interaction, and the interaction significantly enhances G1-mediated transcriptional repression of OsMADS1 expression. The feedback regulatory loop formed between G1 and OsMADS1 provides a key clue for further elucidating the molecular mechanisms underlying sterile lemma development.