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<p>Rice (<i>Oryza sativa</i> L.), a chilling-sensitive staple crop originating from tropical and subtropical Asia, can be cultivated in temperate regions through the introduction of chilling tolerance traits. However, the molecular mechanisms underlying this adaptation remain largely unknown. Herein, we show that <i>HAN2</i>, a quantitative trait locus, confers chilling tolerance in <i>temperate</i> <i>japonica</i> rice. <i>HAN2</i> encodes an auxin efflux transporter (OsABCB5) and negatively regulates chilling tolerance, potentially via auxin-mediated signaling pathway. During rice domestication, <i>HAN2</i> has undergone selective divergence between the <i>indica</i> and <i>temperate</i> <i>japonica</i> subspecies. In <i>temperate</i> <i>japonica</i> rice, the insertion of a <i>Copia</i> long terminal repeat retrotransposon downstream of <i>HAN2</i> reduces its expression, thereby enhancing chilling tolerance and facilitating adaptation to temperate climates. Introgression of the <i>temperate</i> <i>japonica HAN2</i> allele into <i>indica</i> rice significantly improves chilling tolerance at both seedling and booting stages. These findings advance our understanding of rice northward expansion and provide a valuable genetic resource for improving yield stability under chilling stress.</p>

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Suppressing an auxin efflux transporter enhances rice adaptation to temperate habitats

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年5月2日

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  • Yanchun Cui,
  • Lifang Huang,
  • Peng Liu,
  • Xiaodong Wang,
  • Bi Wu,
  • Yongjun Tan,
  • Xuan Huang,
  • Xiaojie Hu,
  • Zhankun He,
  • Yuqi Xia,
  • Zebang Li,
  • Wenli Zhang,
  • Wenbang Tang,
  • Yongzhong Xing,
  • Caiyan Chen,
  • Donghai Mao

摘要

Rice (Oryza sativa L.), a chilling-sensitive staple crop originating from tropical and subtropical Asia, can be cultivated in temperate regions through the introduction of chilling tolerance traits. However, the molecular mechanisms underlying this adaptation remain largely unknown. Herein, we show that HAN2, a quantitative trait locus, confers chilling tolerance in temperate japonica rice. HAN2 encodes an auxin efflux transporter (OsABCB5) and negatively regulates chilling tolerance, potentially via auxin-mediated signaling pathway. During rice domestication, HAN2 has undergone selective divergence between the indica and temperate japonica subspecies. In temperate japonica rice, the insertion of a Copia long terminal repeat retrotransposon downstream of HAN2 reduces its expression, thereby enhancing chilling tolerance and facilitating adaptation to temperate climates. Introgression of the temperate japonica HAN2 allele into indica rice significantly improves chilling tolerance at both seedling and booting stages. These findings advance our understanding of rice northward expansion and provide a valuable genetic resource for improving yield stability under chilling stress.