Contrasting evolutionary trajectories of multiple retrotransposons following independent allopolyploidy in wild wheats
Article first published online: 18 FEB 2014
© 2014 The Authors. New Phytologist © 2014 New Phytologist Trust
Volume 202, Issue 3, pages 975–985, May 2014
How to Cite
Senerchia, N., Felber, F. and Parisod, C. (2014), Contrasting evolutionary trajectories of multiple retrotransposons following independent allopolyploidy in wild wheats. New Phytologist, 202: 975–985. doi: 10.1111/nph.12731
- Issue published online: 10 APR 2014
- Article first published online: 18 FEB 2014
- Manuscript Accepted: 9 JAN 2014
- Manuscript Received: 3 DEC 2013
- Swiss National Science Foundation
- National Centre of Competence in Research ‘Plant Survival’. Grant Number: PZ00P3-131950
- Aegilops ;
- genome evolution;
- genome shock;
- pivotal-differential genome evolution;
- sequence-specific amplified polymorphism (SSAP);
- transposable elements (TEs)
- Transposable elements (TEs) are expectedly central to genome evolution. To assess the impact of TEs in driving genome turnover, we used allopolyploid genomes, showing considerable deviation from the predicted additivity of their diploid progenitors and thus having undergone major restructuring.
- Genome survey sequencing was used to select 17 putatively active families of long terminal repeat retrotransposons. Genome-wide TE insertions were genotyped with sequence-specific amplified polymorphism (SSAP) in diploid progenitors and their derived polyploids, and compared with changes in random sequences to assess restructuring of four independent Aegilops allotetraploid genomes.
- Generally, TEs with different evolutionary trajectories from those of random sequences were identified. Thus, TEs presented family-specific and species-specific dynamics following polyploidy, as illustrated by Sabine showing proliferation in particular polyploids, but massive elimination in others. Contrasting with that, only a few families (BARE1 and Romani) showed proliferation in all polyploids. Overall, TE divergence between progenitors was strongly correlated with the degree of restructuring in polyploid TE fractions.
- TE families present evolutionary trajectories that are decoupled from genome-wide changes after allopolyploidy and have a pervasive impact on their restructuring.