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<p>Phylogenetic origin of the Y haplome present in allopolyploid Triticeae species remains unknown. Here, we report the 10.47 Gb chromosome-scale genome of allohexaploid <i>Elymus nutans</i> (StStYYHH). Phylogenomic analyses reveal that the Y haplome is sister to the clade comprising V and Jv haplomes from <i>Dasypyrum</i> and <i>Thinopyum</i>. In addition, H haplome from the <i>Hordeum</i>-like ancestor, St haplome from the <i>Pseudoroegneria</i>-like ancestor and Y haplome are placed in the successively diverged clades. Resequencing data reveal the allopolyploid origins with St, Y, and H haplome combinations in <i>Elymus</i>. Population genomic analyses indicate that <i>E. nutans</i> has expanded from medium to high/low-altitude regions. Phenotype/environmental association analyses identify <i>MAPKKK18</i> promoter mutations reducing its expression, aiding UV-B adaptation in high-altitude populations. These findings enhance understanding of allopolyploid evolution and aid in breeding forage and cereal crops through intergeneric hybridization within Triticeae.</p>

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Analysis of allohexaploid wheatgrass genome reveals its Y haplome origin in Triticeae and high-altitude adaptation

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年4月1日

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  • Yi Xiong,
  • Shuai Yuan,
  • Yanli Xiong,
  • Lizuiyue Li,
  • Jinghan Peng,
  • Jin Zhang,
  • Xing Fan,
  • Chengzhi Jiang,
  • Li-na Sha,
  • Zhaoting Wang,
  • Xue Peng,
  • Zecheng Zhang,
  • Qingqing Yu,
  • Xiong Lei,
  • Zhixiao Dong,
  • Yingjie Liu,
  • Junming Zhao,
  • Guangrong Li,
  • Zujun Yang,
  • Shangang Jia,
  • Daxu Li,
  • Ming Sun,
  • Shiqie Bai,
  • Jianquan Liu,
  • Yongzhi Yang,
  • Xiao Ma

摘要

Phylogenetic origin of the Y haplome present in allopolyploid Triticeae species remains unknown. Here, we report the 10.47 Gb chromosome-scale genome of allohexaploid Elymus nutans (StStYYHH). Phylogenomic analyses reveal that the Y haplome is sister to the clade comprising V and Jv haplomes from Dasypyrum and Thinopyum. In addition, H haplome from the Hordeum-like ancestor, St haplome from the Pseudoroegneria-like ancestor and Y haplome are placed in the successively diverged clades. Resequencing data reveal the allopolyploid origins with St, Y, and H haplome combinations in Elymus. Population genomic analyses indicate that E. nutans has expanded from medium to high/low-altitude regions. Phenotype/environmental association analyses identify MAPKKK18 promoter mutations reducing its expression, aiding UV-B adaptation in high-altitude populations. These findings enhance understanding of allopolyploid evolution and aid in breeding forage and cereal crops through intergeneric hybridization within Triticeae.