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Journal of Integrative Plant Biology >

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DOI: https://doi.org/10.1111/jipb.13902

Research Article

High-quality genome of allotetraploid Avena barbata provides insights into the origin and evolution of B subgenome in Avena

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  • 1. College of Life Sciences, Institute of Life Science and Green Development, Hebei University, Baoding 071000, China
    2. Hebei Basic Science Center for Biotic Interaction, Hebei University, Baoding 071000, China
    3. State Key Laboratory of Plant Environmental Resilience, College of Biological Sciences, China Agricultural University, Beijing 100094, China

    †These authors contributed equally to this work.
    *Correspondence: Huilong Du (huilongdu@hbu.edu.cn)

Received date: 2024-07-01

  Accepted date: 2025-02-24

  Online published: 2025-04-14

Supported by

This work was supported by the Young Elite Scientists Sponsorship Program by CAST Grant No. YESS20210080, the National Natural Science Foundation of China (Grant No.32100500), the Natural Science Foundation of Hebei Province (Grant Nos: C2021201048 and C2023201074) and the Interdisciplinary Research Program of Natural Science of Hebei University (Grant No: 513201422004). The Excellent Youth Research Innovation Team of Hebei University (Grant No. QNTD202401). Funded by the Science and Technology Project of the Hebei Education Department (Grant No. QN2024271).

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Abstract

Avena barbata, a wild oat species within the genus Avena, is a widely used model for studying plant ecological adaptation due to its strong environmental adaptability and disease resistance, serving as a valuable genetic resource for oat improvement. Here, we phased the high-quality chromosome-level genome assembly of A. barbata (6.88 Gb, contig N50 = 53.74 Mb) into A (3.57 Gb with 47,687 genes) and B (3.31 Gb with 46,029 genes) subgenomes. Comparative genomics and phylogenomic analyses clarified the evolutionary relationships and trajectories of A, B, C and D subgenomes in Avena. We inferred that the A subgenome donor of A. barbata was Avena hirtula, while the B subgenome donor was probably an extinct diploid species closely related to Avena wiestii. Genome evolution analysis revealed the dynamic transposable element (TE) content and subgenome divergence, as well as extensive structure variations across A, B, C, and D subgenomes in Avena. Population genetic analysis of 211 A. barbata accessions from distinct ecotypes identified several candidate genes related to environmental adaptability and drought resistance. Our study provides a comprehensive genetic resource for exploring the genetic basis underlying the strong environmental adaptability of A. barbata and the molecular identification of important agronomic traits for oat breeding.

Key words： allotetraploid; Avena barbata; B subgenome; genome evolution; subgenome differentiation

Cite this article

Qiang He, Yao Xiao, Tao Li, Yaru Wang, Yitao Wang, Yu Wang, Wei Li, Ningkun Liu, Zhizhong Gong, Huilong Du . High-quality genome of allotetraploid Avena barbata provides insights into the origin and evolution of B subgenome in Avena[J]. Journal of Integrative Plant Biology, 0 : 1 . DOI: 10.1111/jipb.13902

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