Subgenomic stability of progenitor genomes during repeated allotetraploid origins of the same grass Brachypodium hybridum.

ABSTRACT: Both homeologous exchanges (HEs) and homeologous expression bias (HEB) are generally found in most allopolyploid species. Whether HEs and HEBs differ between repeated allopolyploid speciation events from the same progenitor species remains unknown. Here we detected a third independent and recent allotetraploid origin for the model grass Brachypodium hybridum. Our HE with replacement analyses indicated the absence of significant homeologous exchanges in any of the three types of wild allotetraploids, supporting the integrity of their progenitor subgenomes and the immediate creation of the amphidiploids. Further HEB tests did not uncover significant subgenomic dominance in different tissues and conditions of the allotetraploids. This suggests a balanced expression of homeologs under similar

SUBMITTER: Mu W 

PROVIDER: S-EPMC10708906 | biostudies-literature | 2023 Nov

REPOSITORIES: biostudies-literature