Hybridization‐facilitated genome merger and repeated chromosome fusion after 8 million years

• DOI: 10.1111/tpj.14065
• Publication Date: 2018-08-13T02:59:13Z
• Authors: Terezie Mandáková; Xinyi Guo; Barış Özüdoğru; Klaus Mummenhoff; Martin A. Lysak
• Keywords: Chromosomal rearrangement; myr

Summary 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 origin subsequent evolution of . ancestral genome originated through hybridization between two older genomes with n = 7 8 chromosomes, respectively, on Turkish mainland during Early Miocene ( c 17.8 million years ago, Ma). Since then, allotetraploid 15) has been altered by independent descending dysploidies DD ) 14 in aucheri Tenuifolia clade (2 spp.). Late 10 Ma), latter started evolve most diverse core (6 spp.), process preceded event 13. It noteworthy that this dysploidy was mediated unique chromosomal rearrangement, merging together same chromosomes as were merged fusion within paternal 20 Ma. This shows time period Myr can repeat itself structurally very similar may originate repeatedly from different pathways (end‐to‐end translocation versus nested insertion).