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• W4366263114 abstract "Abstract The shift from outcrossing to self-fertilization is one of the main evolutionary transitions in plants, and has broad effects on evolutionary trajectories. In Brassicaceae, the ability to impede self-fertilization is controlled by two genes, SCR and SRK, tightly linked within the S-locus. A series of small non-coding RNAs also encoded within the S-locus regulates the transcriptional activity of SCR alleles, resulting in a linear dominance hierarchy between them. Brassicaceae allopolyploid species are often self-compatible (SC) even when one of their parents is self-incompatible, but the causes of the loss of self-incompatibility (SI) in polyploid lineages have generally remained elusive. We used a series of synthetic hybrids obtained between self-fertilizing Capsella orientalis and outcrossing C. grandiflora to test whether the breakdown of SI in allopolyploid species, such as C. bursa-pastoris , could be explained by the dominance interactions between S-haplotypes inherited from the parental lineages. After establishing a database of reference S-allele sequences, we used RNA-sequencing data from young inflorescences to measure allele-specific expression of the SCR and SRK genes in diploid and tetraploid synthetic hybrids. We then compared the observed expression of SCR alleles with the predicted dominance relationship between S-haplotypes in pollen and with the seed set from autonomous self-fertilization in the synthetic hybrids. Our results formally establish that upon hybridization, the immediate effect on the mating system depends on the relative dominance between S-alleles inherited from the parental species. They illustrate that a detailed understanding of the genetic architecture of the control of SI is essential to predict the patterns of association between the mating system and changes in ploidy. Lay summary Polyploidy is the inheritable condition of carrying more than two sets of chromosomes. It can result from within-species genome duplication (auto-polyploidy), or from the merging of sets of chromosomes from different species following hybridization (allo-polyploidy). Because sexual reproduction between individuals of different levels of ploidy is generally not successful, self-fertilization has been considered a key component of the establishment success of polyploid lineages. However, the reasons why the mating system of polyploids may differ from that of their parental species remains mysterious. In plants of the Brassicaceae family, several allopolyploid species arose from hybridization between an outcrossing and a self-fertilizing species, and in most cases the resulting lineages are self-fertilizing. It has been proposed that the mating system of these allopolyploids depends on the dominance relationships between the functional and non-functional self-incompatibility alleles inherited from the parental species. Here, we tested this prediction by characterizing at the transcriptional (RNA-seq) and phenotypic levels (estimation of autonomous seed production) a series of synthetic Capsella diploid and tetraploid hybrids. We found that the predicted dominance relationships matched the observed expression of self-incompatibility alleles, as well as the mating system phenotypes. Hence, the mating system of newly formed Capsella allotetraploids depends on the dominance relationship between self-incompatibility alleles inherited from the parents. Overall, our results improve our understanding of the mechanisms by which changes in ploidy can alter the system of mating over the course of evolution." @default.
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• W4366263114 date "2023-04-18" @default.
• W4366263114 modified "2023-10-17" @default.
• W4366263114 title "Dominance between self-incompatibility alleles determines the mating system of Capsella allopolyploids" @default.
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• W4366263114 doi "https://doi.org/10.1101/2023.04.17.537155" @default.
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