Title :

Varying importance of postzygotic isolation in polyploid speciation? A survey of the triploid block strength, its causal mechanisms, and evolutionary consequences

Author(s) :

Salony, Susnata [Auteur]
Univerzita Karlova [Praha, Česká republika] = Charles University [Prague, Czech Republic] [UK]
Clo, Josselin [Auteur]
Univerzita Karlova [Praha, Česká republika] = Charles University [Prague, Czech Republic] [UK]
Évolution, Écologie et Paléontologie (Evo-Eco-Paleo) - UMR 8198 [Evo-Eco-Paléo (EEP)]
Kolář, Filip [Auteur]
Univerzita Karlova [Praha, Česká republika] = Charles University [Prague, Czech Republic] [UK]
Lafon Placette, Clément [Auteur]
Univerzita Karlova [Praha, Česká republika] = Charles University [Prague, Czech Republic] [UK]

Publication date :

2024-07-15

English keyword(s) :

adaptation -evolutionary
embryogenesis and seed development
angiosperms triploid block
hybrid seed lethality
polyploidy speciation
postzygotic barrier
seed development triploid block
seed development

HAL domain(s) :

Sciences du Vivant [q-bio]/Génétique/Génétique des plantes
Sciences du Vivant [q-bio]/Biologie du développement
Sciences du Vivant [q-bio]/Biodiversité/Evolution [q-bio.PE]

English abstract : [en]

The triploid block, primarily caused by endosperm developmental issues, is known as a significant barrier to interploidy hybridization among flowering plants and thereby, polyploid speciation. However, its strength varies ...
Show more >The triploid block, primarily caused by endosperm developmental issues, is known as a significant barrier to interploidy hybridization among flowering plants and thereby, polyploid speciation. However, its strength varies across taxa, with some instances of leakiness, questioning its universal role as a barrier. We conducted a literature survey to explore the causes of the variation in the strength of triploid block across angiosperms. We particularly assessed the impact of interploidy cross direction, types of endosperm development, endosperm persistence at seed maturity, and ploidy divergence. None of these factors had a significant impact on triploid seed viability, likely due to limited data and inconsistencies in estimation methods across the literature. In addition, triploid seed viability in experimental crosses was sometimes correlated to the occurrence of triploid hybrids in nature, sometimes not, suggesting a mixed role of the triploid block in shaping interspecies gene flow. Altogether, our study highlights the need for unified approaches in future studies on the triploid block to advance our understanding of its variation and evolutionary implications.Show less >

Language :

Anglais

Collections :

• Évolution, Écologie et Paléontologie (Evo Eco Paleo) - UMR 8198

Source :

Harvested from HAL

Submission date :

2024-08-22T02:19:37Z