Chromosome restructuring among hybridizing wild wheats

Parisod, Christian; Badaeva, Ekaterina D. (2020). Chromosome restructuring among hybridizing wild wheats. New Phytologist, 226(5), pp. 1263-1273. Wiley-Blackwell 10.1111/nph.16415

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The wheat group offers an outstanding system to address the interplay between hybridization, chromosomal evolution and biological diversification. Most diploid wild wheats originated following hybridization between the A‐genome lineage and the B‐genome lineage some 4MY ago, resulting in an admixed D‐genome lineage that presented dramatic radiation accompanied by considerable changes in genome size and chromosomal rearrangements. Comparative profiling of low‐copy genes, repeated sequences and transposable elements among those divergent species characterized by different karyotypes highlights high genome dynamics and shed new light on processes underlying chromosomal evolution in wild wheats. One of the hybrid clades presents upsizing of metacentric chromosomes going along with the proliferation of specific repeats (i.e. “genomic obesity”), whereas other species show stable genome size associated with increasing chromosomal asymmetry. Genetic and ecological variation in those specialized species suggest that genome restructuring was coupled with adaptive processes to support the evolution of a majority of acrocentric chromosomes. This synthesis of current knowledge on genome restructuring across the diversity of wild wheats paves the way towards surveys based on latest sequencing technologies to characterize valuable resources and address the significance of chromosomal evolution in species with complex genomes.

Item Type:

Journal Article (Review Article)

Division/Institute:

08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS)
08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS) > Ecological Genomics

UniBE Contributor:

Parisod, Christian Gérard

Subjects:

500 Science > 580 Plants (Botany)

ISSN:

0028-646X

Publisher:

Wiley-Blackwell

Language:

English

Submitter:

Peter Alfred von Ballmoos-Haas

Date Deposited:

22 Jan 2020 16:32

Last Modified:

09 Jan 2021 02:30

Publisher DOI:

10.1111/nph.16415

PubMed ID:

31913521

Uncontrolled Keywords:

Aegilops-Triticum (wild wheats), chromosome evolution, hybrid speciation, genome dynamics, repeated sequences, transposable elements

BORIS DOI:

10.7892/boris.139068

URI:

https://boris.unibe.ch/id/eprint/139068

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