Bachmann, Jorg A., Tedder, Andrew ORCID: 0000-0002-7378-4673, Fracassetti, Marco ORCID: 0000-0002-2962-2669, Steige, Kim A., Lafon-Placette, Clement, Kohler, Claudia ORCID: 0000-0002-2619-4857 and Slotte, Tanja (2021). On the origin of the widespread self-compatible allotetraploid Capsella bursa-pastoris (Brassicaceae). Heredity, 127 (1). S. 124 - 135. LONDON: SPRINGERNATURE. ISSN 1365-2540
Full text not available from this repository.Abstract
Polyploidy, or whole-genome duplication, is a common speciation mechanism in plants. An important barrier to polyploid establishment is a lack of compatible mates. Because self-compatibility alleviates this problem, it has long been hypothesized that there should be an association between polyploidy and self-compatibility (SC), but empirical support for this prediction is mixed. Here, we investigate whether the molecular makeup of the Brassicaceae self-incompatibility (SI) system, and specifically dominance relationships among S-haplotypes mediated by small RNAs, could facilitate loss of SI in allopolyploid crucifers. We focus on the allotetraploid species Capsella bursa-pastoris, which formed similar to 300 kya by hybridization and whole-genome duplication involving progenitors from the lineages of Capsella orientalis and Capsella grandiflora. We conduct targeted long-read sequencing to assemble and analyze eight full-length S-locus haplotypes, representing both homeologous subgenomes of C. bursa-pastoris. We further analyze small RNA (sRNA) sequencing data from flower buds to identify candidate dominance modifiers. We find that C. orientalis-derived S-haplotypes of C. bursa-pastoris harbor truncated versions of the male SI specificity gene SCR and express a conserved sRNA-based candidate dominance modifier with a target in the C. grandiflora-derived S-haplotype. These results suggest that pollen-level dominance may have facilitated loss of SI in C. bursa-pastoris. Finally, we demonstrate that spontaneous somatic tetraploidization after a wide cross between C. orientalis and C. grandiflora can result in production of self-compatible tetraploid offspring. We discuss the implications of this finding on the mode of formation of this widespread weed.
Item Type: | Journal Article | ||||||||||||||||||||||||||||||||
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URN: | urn:nbn:de:hbz:38-592174 | ||||||||||||||||||||||||||||||||
DOI: | 10.1038/s41437-021-00434-9 | ||||||||||||||||||||||||||||||||
Journal or Publication Title: | Heredity | ||||||||||||||||||||||||||||||||
Volume: | 127 | ||||||||||||||||||||||||||||||||
Number: | 1 | ||||||||||||||||||||||||||||||||
Page Range: | S. 124 - 135 | ||||||||||||||||||||||||||||||||
Date: | 2021 | ||||||||||||||||||||||||||||||||
Publisher: | SPRINGERNATURE | ||||||||||||||||||||||||||||||||
Place of Publication: | LONDON | ||||||||||||||||||||||||||||||||
ISSN: | 1365-2540 | ||||||||||||||||||||||||||||||||
Language: | English | ||||||||||||||||||||||||||||||||
Faculty: | Unspecified | ||||||||||||||||||||||||||||||||
Divisions: | Unspecified | ||||||||||||||||||||||||||||||||
Subjects: | no entry | ||||||||||||||||||||||||||||||||
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URI: | http://kups.ub.uni-koeln.de/id/eprint/59217 |
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