Rahnamae, Neda 
ORCID: 0009-0005-1607-0323, Metzger, Lukas ORCID: 0009-0007-3791-0154, Hördemann, Lea, Korfmann, Kevin ORCID: 0000-0001-8869-8949, Khan, Abdul Saboor ORCID: 0000-0001-7924-7986, Özoglan, Yasar, Dent, Craig I. ORCID: 0000-0001-5688-3824, Amar, Samija ORCID: 0000-0001-7811-1614, Wijfjes, Raúl Y. ORCID: 0000-0003-0806-2911, Ali, Tahir ORCID: 0000-0003-2371-0884, Schmitz, Gregor ORCID: 0000-0002-8624-3024, Stich, Benjamin ORCID: 0000-0001-6791-8068, Tellier, Aurelien ORCID: 0000-0002-8895-0785 and de Meaux, Juliette ORCID: 0000-0002-2942-4750
(2026).
Contemporary hybridization among Arabis floodplain species creates opportunities for adaptation.
New Phytologist, 249 (3).
pp. 1542-1557.
Wiley.
ISSN 0028-646X
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Abstract
Hybridization between closely related species is increasingly recognized as a major source of biodiversity. Yet, whether it can create advantageous trait combinations while purging harmful alleles remains unknown. To address this question, we studied Arabis nemorensis and Arabis sagittata, two endangered species that currently hybridize in a single hotspot. We chose two representative individuals originating from the hotspot, generated high-quality annotated genome sequences, crossed them to form an F2 population, quantified segregation distortion along the genome, measured 22 phenotypic traits and mapped their genetic basis. Two genomic regions showed strong segregation distortion favoring A. sagittata alleles in the F2 and potentially accelerating their introgression. Fifty-eight quantitative trait loci (QTLs) were identified for 20 traits, with additive and dominance effects best fitting Gaussian and logistic distributions, respectively. It was found that 48% of QTLs were unlinked to reduced fitness or segregation distortion. A major QTL affecting flowering time implicated Terminal-Flower 1 (TFL1) as a candidate gene for life-history adaptation. QTLs did not overlap with recent selective sweeps, except for those controlling rosette size. Our findings offer unique insights into both the potential for adaptive trait combinations and the constraints imposed by hybrid fitness loss during incipient stages of hybridization.
| Item Type: | Article |
| Creators: | Creators Email ORCID ORCID Put Code Hördemann, Lea UNSPECIFIED UNSPECIFIED UNSPECIFIED Özoglan, Yasar UNSPECIFIED UNSPECIFIED UNSPECIFIED |
| URN: | urn:nbn:de:hbz:38-812949 |
| Identification Number: | 10.1111/nph.70779 |
| Journal or Publication Title: | New Phytologist |
| Volume: | 249 |
| Number: | 3 |
| Page Range: | pp. 1542-1557 |
| Number of Pages: | 16 |
| Date: | 10 February 2026 |
| Publisher: | Wiley |
| ISSN: | 0028-646X |
| Language: | English |
| Faculty: | Faculty of Mathematics and Natural Sciences |
| Divisions: | Faculty of Mathematics and Natural Sciences > Department of Biology > Botanical Institute Faculty of Mathematics and Natural Sciences > Department of Biology > Zoologisches Institut |
| Subjects: | Life sciences |
| Uncontrolled Keywords: | Keywords Language Arabis nemorensis ; Arabis sagittate ; fine-mapping ; genetic incompatibility ; hybridization ; quantitative trait loci (QTL) ; segregation distortion English |
| ['eprint_fieldname_oa_funders' not defined]: | Publikationsfonds UzK |
| Refereed: | Yes |
| URI: | http://kups.ub.uni-koeln.de/id/eprint/81294 |
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