Hybridization-facilitated genome merger and repeated chromosome fusion after 8 million years
Language English Country Great Britain, England Media print-electronic
Document type Journal Article, Research Support, Non-U.S. Gov't
PubMed
30101476
DOI
10.1111/tpj.14065
Knihovny.cz E-resources
- Keywords
- Ricotia, ancient polyploidy, chromosomal rearrangements, diploidization, dysploidy, hybridization, karyotype evolution,
- MeSH
- Brassicaceae classification genetics MeSH
- Chromosome Aberrations MeSH
- Chromosomes, Plant * MeSH
- Phylogeny MeSH
- Genome, Plant MeSH
- Hybridization, Genetic * MeSH
- Karyotyping MeSH
- Chromosome Painting MeSH
- Evolution, Molecular * MeSH
- Ploidies MeSH
- Publication type
- Journal Article MeSH
- Research Support, Non-U.S. Gov't MeSH
- Geographicals
- Turkey MeSH
The small genus Ricotia (nine species, Brassicaceae) is confined to the eastern Mediterranean. By comparative chromosome painting and a dated multi-gene chloroplast phylogeny, we reconstructed the origin and subsequent evolution of Ricotia. The ancestral Ricotia genome originated through hybridization between two older genomes with n = 7 and n = 8 chromosomes, respectively, on the Turkish mainland during the Early Miocene (c. 17.8 million years ago, Ma). Since then, the allotetraploid (n = 15) genome has been altered by two independent descending dysploidies (DD) to n = 14 in Ricotia aucheri and the Tenuifolia clade (2 spp.). By the Late Miocene (c. 10 Ma), the latter clade started to evolve in the most diverse Ricotia core clade (6 spp.), the process preceded by a DD event to n = 13. It is noteworthy that this dysploidy was mediated by a unique chromosomal rearrangement, merging together the same two chromosomes as were merged during the origin of a fusion chromosome within the paternal n = 7 genome c. 20 Ma. This shows that within a time period of c. 8 Myr genome evolution can repeat itself and that structurally very similar chromosomes may originate repeatedly from the same ancestral chromosomes by different pathways (end-to-end translocation versus nested chromosome insertion).
CEITEC Central European Institute of Technology Masaryk University 625 00 Brno Czech Republic
Department of Biology Botany University of Osnabrück Barbarastraße 11 49076 Osnabrück Germany
Department of Biology Faculty of Science Hacettepe University 06800 Beytepe Ankara Turkey
References provided by Crossref.org
Bridging micro and macroevolution: insights from chromosomal dynamics in plants
Genome evolution of the psammophyte Pugionium for desert adaptation and further speciation
GENBANK
MH359178, MH359188
