Extensive homoeologous genome exchanges in allopolyploid crops revealed by mRNAseq-based visualization.

ABSTRACT: Polyploidy, the possession of multiple sets of chromosomes, has been a predominant factor in the evolution and success of the angiosperms. Although artificially formed allopolyploids show a high rate of genome rearrangement, the genomes of cultivars and germplasm used for crop breeding were assumed stable and genome structural variation under the artificial selection process of commercial breeding has remained little studied. Here, we show, using a repurposed visualization method based on transcriptome sequence data, that genome structural rearrangement occurs frequently in varieties of three polyploid crops (oilseed rape, mustard rape and bread wheat), meaning that the extent of genome structural variation present in commercial crops is much higher than expected. Exchanges were found to o

SUBMITTER: He Z 

PROVIDER: S-EPMC5399007 | biostudies-literature | 2017 May

REPOSITORIES: biostudies-literature