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Polyploidy is the presence in cells of more than a single pair of each chromosome. Polyploidy can be the result of a spontaneous multiplication of a plants genetic material or through hybridization, and is extremely common in domesticated crops.
We build a polyploid reference genome for hybrid sugarcane cultivar R570, improving on its current ‘mosaic monoploid’ representation, enabling fine-grain description of genome architecture and the exploration of candidate genes underlying the Bru1 brown rust resistance locus.
Subgenome dominance is widely observed in allopolyploid species, but the molecular mechanisms remain unclear. Here, the authors generate genome-wide map of accessible chromatin regions (ACRs) in allo-octoploid cultivated strawberry and reveal that dynamics of the ACRs play an important role in its subgenome dominance.
Coffea arabica is an allotetraploid hybrid of C. eugenioides and C. canephora and contributes to approximately 60% of world coffee production. Here, the authors report its chromosome-level genome assembly and identify that chromosomal abnormalities and introgression from C. canephora may contribute to diversity and pathogen resistance.
An updated, chromosome-scale genome assembly of quinoa enables the characterization of subgenome dynamics, including the identification of large structural rearrangements. The B subgenome is also more dynamic and has expanded more than the A subgenome.
Self-incompatibility in diploid Arabidopsis relatives is determined by a dominance relationship that is epigenetically regulated. Using transgenic methods, this study demonstrates that the dominance relationship between subgenomes of the allopolyploid species Arabidopsis kamchatica underlies it’s self-compatibility.
High-quality genomes of the cultivated strawberry’s progenitors provide the strongest evidence to date for the identity and chromosomal composition of the four subgenomes of octoploid strawberry.
Development of flowers typically employs conserved molecular pathways and recurrent sets of homologous genes. A new study shows that a homologue of RADIALIS, a gene well known to control flower symmetry, is recruited to serve a different function.
The sequencing and draft assembly of the sweet potato genome has resolved much of its complex genetic redundancies, allowing a better inference of the botanical origin of the staple crop.