Competition of Parental Genomes in Plant Hybrids

Frontiers in Plant Science
Marek GlombikD Kopecký

Abstract

Interspecific hybridization represents one of the main mechanisms of plant speciation. Merging of two genomes from different subspecies, species, or even genera is frequently accompanied by whole-genome duplication (WGD). Besides its evolutionary role, interspecific hybridization has also been successfully implemented in multiple breeding programs. Interspecific hybrids combine agronomic traits of two crop species or can be used to introgress specific loci of interests, such as those for resistance against abiotic or biotic stresses. The genomes of newly established interspecific hybrids (both allopolyploids and homoploids) undergo dramatic changes, including chromosome rearrangements, amplifications of tandem repeats, activation of mobile repetitive elements, and gene expression modifications. To ensure genome stability and proper transmission of chromosomes from both parental genomes into subsequent generations, allopolyploids often evolve mechanisms regulating chromosome pairing. Such regulatory systems allow only pairing of homologous chromosomes and hamper pairing of homoeologs. Despite such regulatory systems, several hybrid examples with frequent homoeologous chromosome pairing have been reported. These reports open a wa...Continue Reading

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Citations

Feb 7, 2021·The Plant Journal : for Cell and Molecular Biology·Matteo SchiavinatoHeinz Himmelbauer
Mar 23, 2021·The Plant Cell·Yves Van de PeerDouglas E Soltis
Jun 22, 2021·The Plant Journal : for Cell and Molecular Biology·Marek GlombikDavid Kopecky

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