2025-05-31 中国科学院（CAS）
The HAN2 gene in rice facilitates the adaptation of japonica rice to temperate climates (Image by CUI Yanchun)
＜関連情報＞
- https://english.cas.cn/newsroom/research_news/life/202506/t20250603_1044932.shtml
- https://www.nature.com/articles/s41467-025-59449-z
オーキシン排出トランスポーターの抑制はイネの温帯生息地への適応を促進する Suppressing an auxin efflux transporter enhances rice adaptation to temperate habitats
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
Nature Communications Published:02 May 2025
DOI:https://doi.org/10.1038/s41467-025-59449-z
Abstract
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.
