Poster De Conférence Année : 2023

Systematic parent-specific expression perturbations in hybrid endosperms may explain how effective ploidy differences cause hybrid seed failure

Résumé

Hybrid seed inviability (HSI) is a common post-zygotic reproductive barrier in angiosperms caused by endosperm mis-development. Recent studies suggest that “effective ploidy” divergence driven by parental conflict may be responsible for HSI, yet these phenomena remain poorly characterized at the molecular level. We analyzed endosperm transcriptomes in 12 reciprocal crosses within and among three diploid wild tomato lineages and tested 5,015 endosperm-expressed informative genes common to all hybrid crosses for Differential Parental Expression (DPE between hybrid and their corresponding intraspecific endosperms). Strikingly, allelic expression is systematically more perturbed in the parent with lower effective ploidy. We illustrate and discuss the complex interplay between parental expression proportions, total and parent-specific expression in abortive endosperms. Overall, our analyses yield candidate genes/pathways that may underpin the unknown epigenomic imbalances underlying HSI.
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Dates et versions

hal-04177477 , version 1 (04-08-2023)

Identifiants

  • HAL Id : hal-04177477 , version 1

Citer

Morgane Roth, Ana Florez-Rueda, Thomas Städler. Systematic parent-specific expression perturbations in hybrid endosperms may explain how effective ploidy differences cause hybrid seed failure. Plant Biology Europe, Jul 2023, Marseille, France. ⟨hal-04177477⟩
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