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<p>Growing evidence suggests that JA crosstalk with other phytohormones, such as gibberellic acid (GA), plays a crucial role in modulating plant growth and development. In this study, we show that <i>OsJAZ9</i>, which interacts with OsSLR1, regulates rice tiller formation by modulating the GA-dependent <i>MOC1</i> pathway. Knock-out of <i>OsJAZ9</i>, a repressor of JA signaling, significantly increased tiller number under greenhouse conditions. Agronomic trait analysis under field conditions further supported the function of <i>OsJAZ9</i> in tiller formation and indicated that enhanced tillering in <i>OsJAZ9</i> mutants contributes to improved rice productivity. In addition, we found that the knock-out mutation of <i>OsJAZ9</i>, which enhances JA response while reducing GA response, promotes the expression of <i>MOC1</i>, a key determinant of tiller development, and its downstream genes <i>FON1</i> and <i>OSH1</i>. Consistent with this, exogenous GA treatment downregulated the expression of tillering genes, whereas JA upregulated them. Together with AlphaFold-Multimer-based analysis supporting the interaction between <i>OsJAZ9</i> and OsSLR1, a repressor of GA signaling, these findings suggest that <i>OsJAZ9</i> regulates <i>MOC1</i>-dependent tiller formation in rice by mediating antagonistic crosstalk between JA and GA.</p>

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Loss of OsJAZ9 promotes rice tillering through JA-GA crosstalk

  • 期刊论文

  • 发表日期：

    2026年7月6日

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  • Deok Hyun Seo,
  • Geupil Jang

摘要

Growing evidence suggests that JA crosstalk with other phytohormones, such as gibberellic acid (GA), plays a crucial role in modulating plant growth and development. In this study, we show that OsJAZ9, which interacts with OsSLR1, regulates rice tiller formation by modulating the GA-dependent MOC1 pathway. Knock-out of OsJAZ9, a repressor of JA signaling, significantly increased tiller number under greenhouse conditions. Agronomic trait analysis under field conditions further supported the function of OsJAZ9 in tiller formation and indicated that enhanced tillering in OsJAZ9 mutants contributes to improved rice productivity. In addition, we found that the knock-out mutation of OsJAZ9, which enhances JA response while reducing GA response, promotes the expression of MOC1, a key determinant of tiller development, and its downstream genes FON1 and OSH1. Consistent with this, exogenous GA treatment downregulated the expression of tillering genes, whereas JA upregulated them. Together with AlphaFold-Multimer-based analysis supporting the interaction between OsJAZ9 and OsSLR1, a repressor of GA signaling, these findings suggest that OsJAZ9 regulates MOC1-dependent tiller formation in rice by mediating antagonistic crosstalk between JA and GA.