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<p>Plant architecture and grain size are critical traits for rice breeding. Brassinosteroid (BR), a class of plant hormones, regulates these traits by modulating cell elongation, division, and differentiation. Therefore, exploring BR-related genes to leverage their pleiotropic effects is crucial for crop improvement. We identify a novel gene, <i>Large Grain 2</i> (<i>LG2</i>), which encodes a Golgi-localized protein containing an NHL domain. This gene plays a crucial role in regulating both plant architecture and grain size in rice. Mechanistically, FUWA, a paralog of LG2, directly interacts with LG2 and enhances its protein stability. Furthermore, our findings indicate that <i>LG2</i> is involved in BR signaling. Collectively, these results suggest that the LG2-FUWA module synergistically regulate plant architecture and grain size through the BR pathway in rice. Our study provides new insights into the function of NHL domain-containing proteins in plants and introduces a novel BR component for crop improvement. The LG2-FUWA module regulates plant architecture and grain size through the BR pathway in rice.</p>

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Large Grain 2, an NHL Domain-Containing Protein, Interacts with FUWA and Regulates Plant Architecture and Grain Size Through the Brassinosteroid Signaling Pathway in Rice

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年5月21日

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  • Zhengyan Xu,
  • Jierui Zeng,
  • Xiaorong Zhou,
  • Yang Liu,
  • Feifan Chen,
  • Haitang Liu,
  • Xiao Peng,
  • Zhengqi Han,
  • Feihong Hou,
  • Hao Wang,
  • Weilan Chen,
  • Bin Tu,
  • Ting Li,
  • Jiawei Xiong,
  • Zhaohui Zhong,
  • Yuping Wang,
  • Bingtian Ma,
  • Peng Qin,
  • Shigui Li,
  • Hua Yuan

摘要

Plant architecture and grain size are critical traits for rice breeding. Brassinosteroid (BR), a class of plant hormones, regulates these traits by modulating cell elongation, division, and differentiation. Therefore, exploring BR-related genes to leverage their pleiotropic effects is crucial for crop improvement. We identify a novel gene, Large Grain 2 (LG2), which encodes a Golgi-localized protein containing an NHL domain. This gene plays a crucial role in regulating both plant architecture and grain size in rice. Mechanistically, FUWA, a paralog of LG2, directly interacts with LG2 and enhances its protein stability. Furthermore, our findings indicate that LG2 is involved in BR signaling. Collectively, these results suggest that the LG2-FUWA module synergistically regulate plant architecture and grain size through the BR pathway in rice. Our study provides new insights into the function of NHL domain-containing proteins in plants and introduces a novel BR component for crop improvement. The LG2-FUWA module regulates plant architecture and grain size through the BR pathway in rice.