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Article Dans Une Revue Current Opinion in Plant Biology Année : 2021

A revival of effective ploidy: the asymmetry of parental roles in endosperm-based hybridization barriers

Résumé

Interest in understanding hybrid seed failure (HSF) has mushroomed, both in terms of identifying underlying molecular processes and their evolutionary drivers. We review phenotypic and molecular advances with a focus on the 'effective ploidy' concept, witnessing a recent revival after long obscurity. Endosperm misdevelopment has now been shown to underlie HSF in many inter-specific, homoploid crosses. The consistent asymmetries in seed size and developmental trajectories likely reflect parental divergence in key, dosage-sensitive processes. Transcriptomic and epigenomic studies reveal genome-wide, polarized expression perturbations and shifts in parental expression proportions, consistent with small-RNA imbalances between parental roles. Among-species differences in levels of parental conflict over resource allocation enjoy strong support in explaining why differences in effective ploidy may evolve.
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Dates et versions

hal-03631570 , version 1 (05-04-2022)

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Paternité - Pas d'utilisation commerciale - Pas de modification

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Thomas Städler, Ana Florez-Rueda, Morgane Roth. A revival of effective ploidy: the asymmetry of parental roles in endosperm-based hybridization barriers. Current Opinion in Plant Biology, 2021, 61, pp.1-7. ⟨10.1016/j.pbi.2021.102015⟩. ⟨hal-03631570⟩
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