| Title: |
Complex Polyploids : Origins, Genomic Composition, and Role of Introgressed Alleles |
| Authors: |
Leal, J Luis; Milesi, Pascal; Hodková, Eva; Zhou, Qiujie; James, Jennifer; Eklund, D Magnus; Pyhäjärvi, Tanja; Salojärvi, Jarkko; Lascoux, Martin |
| Publisher Information: |
Uppsala universitet, Växtekologi och evolution; Uppsala universitet, Science for Life Laboratory, SciLifeLab; Uppsala universitet, Fysiologi och miljötoxikologi; Faculty of Environmental Sciences, Czech University of Life Sciences Prague , Kamýcká 129, 16521 Prague , Czech Republic; Organismal and Evolutionary Biology Research Program, Faculty of Biological and Environmental Sciences, and Viikki Plant Science Centre, University of Helsinki , P.O. Box 65 (Viikinkaari 1), 00014 Helsinki , Finland;Department of Forest Sciences, University of Helsinki , 00014 Helsinki , Finland; School of Biological Sciences, Nanyang Technological University , 60 Nanyang Drive, Singapore 637551 , Singapore;Organismal and Evolutionary Biology Research Program, Faculty of Biological and Environmental Sciences, and Viikki Plant Science Centre, University of Helsinki , P.O. Box 65 (Viikinkaari 1), 00014 Helsinki , Finland |
| Publication Year: |
2024 |
| Collection: |
Uppsala University: Publications (DiVA) |
| Subject Terms: |
Evolutionary Biology; Evolutionsbiologi; Biological Systematics; Biologisk systematik |
| Description: |
Introgression allows polyploid species to acquire new genomic content from diploid progenitors or from other unrelated diploid or polyploid lineages, contributing to genetic diversity and facilitating adaptive allele discovery. In some cases, high levels of introgression elicit the replacement of large numbers of alleles inherited from the polyploid’s ancestral species, profoundly reshaping the polyploid’s genomic composition. In such complex polyploids, it is often difficult to determine which taxa were the progenitor species and which taxa provided additional introgressive blocks through subsequent hybridization. Here, we use population-level genomic data to reconstruct the phylogenetic history of Betula pubescens (downy birch), a tetraploid species often assumed to be of allopolyploid origin and which is known to hybridize with at least four other birch species. This was achieved by modeling polyploidization and introgression events under the multispecies coalescent and then using an approximate Bayesian computation rejection algorithm to evaluate and compare competing polyploidization models. We provide evidence that B. pubescens is the outcome of an autoploid genome doubling event in the common ancestor of B. pendula and its extant sister species, B. platyphylla, that took place approximately 178,000–188,000 generations ago. Extensive hybridization with B. pendula, B. nana, and B. humilisfollowed in the aftermath of autopolyploidization, with the relative contribution of each of these species to the B. pubescens genome varying markedly across the species’ range. Functional analysis of B. pubescens loci containing alleles introgressed from B. nana identified multiple genes involved in climate adaptation, while loci containing alleles derived from B. humilis revealed several genes involved in the regulation of meiotic stability and pollen viability in plant species. |
| Document Type: |
article in journal/newspaper |
| File Description: |
application/pdf |
| Language: |
English |
| Relation: |
Systematic Biology, 1063-5157, 2024, 73:2, s. 392-418; PMID 38613229; ISI:001203806900001 |
| DOI: |
10.1093/sysbio/syae012 |
| Availability: |
http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-536033; https://doi.org/10.1093/sysbio/syae012 |
| Rights: |
info:eu-repo/semantics/openAccess |
| Accession Number: |
edsbas.C0DCDD45 |
| Database: |
BASE |