Disentangling the components of triploid block and its fitness consequences in natural diploid-tetraploid contact zones of Arabidopsis arenosa

0547592 - BÚ 2022 RIV GB eng J - Journal Article
Morgan, E. J. - Čertner, Martin - Lučanová, Magdalena - Deniz, U. - Kubíková, K. - Venon, A. - Kovářík, O. - Lafon Placette, C. - Kolář, Filip
Disentangling the components of triploid block and its fitness consequences in natural diploid-tetraploid contact zones of Arabidopsis arenosa.
New Phytologist. Roč. 232, č. 3 (2021), s. 1449-1462. ISSN 0028-646X. E-ISSN 1469-8137
Institutional support: RVO:67985939
Keywords : speciation * triploid block * whole-genome duplication
OECD category: Plant sciences, botany
Impact factor: 10.323, year: 2021
Method of publishing: Limited access
https://doi.org/10.1111/nph.17357

Hybrid seed inviability (HSI) is an important mechanism of reproductive isolation and speci- ation. HSI varies in strength among populations of diploid species but it remains to be tested whether similar processes affect natural variation in HSI within ploidy-variable species (triploid block). Here we used extensive endosperm, seed and F1-hybrid phenotyping to explore HSI varia- tion within a diploid-autotetraploid species. By leveraging 12 population pairs from three ploidy contact zones, we tested for the effect of interploidy crossing direction (parent of origin), ploidy divergence and spatial arrangement in shaping reproductive barriers in a natu- rally relevant context. We detected strong parent-of-origin effects on endosperm development, F1 germination and survival, which was also reflected in the rates of triploid formation in the field. Endosperm cellularization failure was least severe and F1-hybrid performance was slightly better in the pri- mary contact zone, with genetically closest diploid and tetraploid lineages. We demonstrated overall strong parent-of-origin effects on HSI in a ploidy variable species, which translate to fitness effects and contribute to interploidy reproductive isolation in a natu- ral context. Subtle intraspecific variation in these traits suggests the fitness consequences of HSI are predominantly a constitutive property of the species regardless of the evolutionary background of its populations.
Permanent Link: http://hdl.handle.net/11104/0324573