文献类型： 外文期刊

作者： Li, Xinrui ¹ ; Zhang, Changbing ¹ ; Wang, Lili ⁵ ; Huang, Gai ⁷ ; Li, Daxu ¹ ; Ji, Changmian ⁶ ; Yang, Zujun ⁸ ; You, Minghong ¹ ; Yan, Lijun ¹ ; Chen, Lili ¹ ; Gou, Wenlong ¹ ; Lei, Xiong ¹ ; Ji, Xiaofei ¹ ; Li, Yingzhu ¹ ; Wu, Qi ¹ ; Zhang, Jianbo ¹ ; Chang, Dan ¹ ; Li, Ping ⁹ ; Xiong, Yanli ⁴ ; Xiong, Yi ⁴ ; Han, Mengli ³ ; Chen, Zhao ³ ; Sun, Ming ² ; Wu, Chanjuan ² ; Wang, Ting ² ; Zheng, Hongkun ⁵ ; Ma, Xiao ⁴ ; Yan, Xuebing ³ ; Yan, Jiajun ¹ ; Bai, Shiqie ¹ ;

作者机构： 1.Sichuan Acad Grassland Sci, Chengdu 611731, Peoples R China

2.Southwest Univ Sci & Technol, Sch Life Sci & Engn, Mianyang 621010, Peoples R China

3.Yangzhou Univ, Coll Anim Sci & Technol, Yangzhou 225100, Peoples R China

4.Sichuan Agr Univ, Coll Grassland Sci & Technol, Chengdu 611130, Peoples R China

5.Biomarker Technol Corp, Beijing 101300, Peoples R China

6.Chinese Acad Trop Agr Sci, Sanya Res Inst, Sanya 572000, Peoples R China

7.Chinese Acad Sci, Inst Genet & Dev Biol, Key Lab Seed Innovat, Beijing 100101, Peoples R China

8.Univ Elect Sci & Technol China, Ctr Informat Biol, Sch Life Sci & Technol, Chengdu 611731, Peoples R China

9.Guizhou Univ, Coll Anim Sci, Guiyang 550000, Peoples R China

关键词： Elymus sibiricus L.; allotetraploid; genome evolution; population analysis; genetic diversity

期刊名称：SCIENCE CHINA-LIFE SCIENCES （ 影响因子：9.5； 五年影响因子：8.1 ）

ISSN： 1674-7305

年卷期： 2025 年 68 卷 8 期

页码：

收录情况： SCI

摘要： Elymus sibiricus L., a member of the Triticeae tribe, is a grass widely used for forage and restoring degraded grasslands in the Qinghai-Tibetan Plateau (QTP) region. Here, we present a high-quality reference genome assembly of allotetraploid E. sibiricus, consisting of 14 pseudochromosomes. Our findings suggest that large-scale bursts of retrotransposon activity, especially by Gypsy elements and unclassified retrotransposon elements, have played a critical role in the genome expansion of E. sibiricus as compared with other Triticeae. We identified a translocation between chromosomes Es4H and Es6H with a low recombination rate. Population genomic analysis of 90 E. sibiricus accessions and 25 diploid accessions of proposed ancestors from different habitats revealed four distinct groups, although they are of monophyletic origin. Our population analysis supports the idea that the QTP is likely the center of origin and genetic diversity of E. sibiricus. Selective sweep analysis identified significant pathways related to photosynthesis and metabolism, which are likely associated with the multiple environmental adaptations of this species to the climatic conditions of the QTP. Collectively, our study not only provides genomic resources for genetic improvement of the Elymus genus, but also provides important insights on the evolutionary history of E. sibiricus from population genomic analysis and the evolution of the tribe Triticeae.