Hybrid seed incompatibility in Capsella is connected to chromatin condensation defects in the endosperm

Autoři: Katarzyna Dziasek aff001;  Lauriane Simon aff001;  Clément Lafon-Placette aff001;  Benjamin Laenen aff003;  Cecilia Wärdig aff001;  Juan Santos-González aff001;  Tanja Slotte aff003;  Claudia Köhler aff001
Působiště autorů: Department of Plant Biology, Uppsala Biocenter, Swedish University of Agricultural Sciences, Linnean Center of Plant Biology, Uppsala, Sweden aff001;  Present address: Department of Botany, Faculty of Science, Charles University, Prague, Czech Republic aff002;  Department of Ecology, Environment and Plant Sciences, Science for Life Laboratory, Stockholm University, Stockholm, Sweden aff003
Vyšlo v časopise: Hybrid seed incompatibility in Capsella is connected to chromatin condensation defects in the endosperm. PLoS Genet 17(2): e1009370. doi:10.1371/journal.pgen.1009370
Kategorie: Research Article
doi: https://doi.org/10.1371/journal.pgen.1009370


Hybridization of closely related plant species is frequently connected to endosperm arrest and seed failure, for reasons that remain to be identified. In this study, we investigated the molecular events accompanying seed failure in hybrids of the closely related species pair Capsella rubella and C. grandiflora. Mapping of QTL for the underlying cause of hybrid incompatibility in Capsella identified three QTL that were close to pericentromeric regions. We investigated whether there are specific changes in heterochromatin associated with interspecific hybridizations and found a strong reduction of chromatin condensation in the endosperm, connected with a strong loss of CHG and CHH methylation and random loss of a single chromosome. Consistent with reduced DNA methylation in the hybrid endosperm, we found a disproportionate deregulation of genes located close to pericentromeric regions, suggesting that reduced DNA methylation allows access of transcription factors to targets located in heterochromatic regions. Since the identified QTL were also associated with pericentromeric regions, we propose that relaxation of heterochromatin in response to interspecies hybridization exposes and activates loci leading to hybrid seed failure.

Klíčová slova:

Arabidopsis thaliana – DNA methylation – Endosperm – Chromatin – Plant genomics – Quantitative trait loci – Seeds – Single nucleotide polymorphisms


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