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

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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
Creators:
CreatorsEmailORCIDORCID Put Code
Bachmann, Jorg A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Tedder, AndrewUNSPECIFIEDorcid.org/0000-0002-7378-4673UNSPECIFIED
Fracassetti, MarcoUNSPECIFIEDorcid.org/0000-0002-2962-2669UNSPECIFIED
Steige, Kim A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lafon-Placette, ClementUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kohler, ClaudiaUNSPECIFIEDorcid.org/0000-0002-2619-4857UNSPECIFIED
Slotte, TanjaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
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
Uncontrolled Keywords:
KeywordsLanguage
Ecology; Evolutionary Biology; Genetics & HeredityMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/59217

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