ArticleJournal of experimental botany2025
Genomic and evolutionary evidence for drought adaptation of allopolyploid Brachypodium hybridum.
Article in Journal of experimental botany, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
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Who cites it
4 citing papers in PubMed.
- Review
- Diploid- and tetraploid wall barley exhibit alternative molecular responses but comparable reproductive performance in response to different ambient temperature regimes.The Plant journal : for cell and molecular biology · 2026Article
- Polyploidy: A macromutational force pushing bioeconomic developments.Proceedings of the National Academy of Sciences of the United States of America · 2026Review
- Genomic Composition of the Artificial Hybrid ×Plants (Basel, Switzerland) · 2025Article
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Authors and funding
10 authors.
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Abstract
Climate change is increasing the frequency and severity of drought worldwide, threatening the environmental resilience of cultivated grasses. However, the genetic diversity in many wild grasses could contribute to the development of climate-adapted varieties. Here, we elucidated the impact of polyploidy on drought responses using allotetraploid Brachypodium hybridum (B. hybridum) and its progenitor diploid species Brachypodium stacei (B. stacei). Our findings suggest that progenitor species' genomic legacies resulting from hybridization and whole-genome duplications conferred greater ecological adaptive advantages to B. hybridum compared with B. stacei. Genes related to stomatal regulation and the immune response from S-subgenomes were under positive selection during speciation, underscoring their evolutionary importance in adapting to environmental stresses. Biased expression in polyploid subgenomes (B. stacei-type and B. distachyon-type) significantly influenced differential gene expression, with the dominant subgenome exhibiting more differential expression. B. hybridum adapted a drought escape strategy characterized by higher photosynthetic capacity and lower intrinsic water-use efficiency than B. stacei, driven by a highly correlated coexpression network involving genes in the circadian rhythm pathway. In summary, our study shows the influence of polyploidy on ecological and environmental adaptation and resilience in model Brachypodium grasses. These insights hold promise for informing the breeding of climate-resilient cereal crops and pasture grasses.
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