AlixPolyploidy2017AuthorVersion.pdf (853.58 kB)
Download file

Polyploidy and interspecific hybridization: partners for adaptation, speciation and evolution in plants

Download (853.58 kB)
journal contribution
posted on 12.09.2017, 11:56 by Karine Alix, Pierre R. Gérard, Trude Schwarzacher, J. S. (Pat) Heslop-Harrison
Background Polyploidy or whole-genome duplication is now recognized as being present in almost all lineages of higher plants, with multiple rounds of polyploidy occurring in most extant species. The ancient evolutionary events have been identified through genome sequence analysis, while recent hybridization events are found in about half of the world's crops and wild species. Building from this new paradigm for understanding plant evolution, the papers in this Special Issue address questions about polyploidy in ecology, adaptation, reproduction and speciation of wild and cultivated plants from diverse ecosystems. Other papers, including this review, consider genomic aspects of polyploidy.Approaches Discovery of the evolutionary consequences of new, evolutionarily recent and ancient polyploidy requires a range of approaches. Large-scale studies of both single species and whole ecosystems, with hundreds to tens of thousands of individuals, sometimes involving 'garden' or transplant experiments, are important for studying adaptation. Molecular studies of genomes are needed to measure diversity in genotypes, showing ancestors, the nature and number of polyploidy and backcross events that have occurred, and allowing analysis of gene expression and transposable element activation. Speciation events and the impact of reticulate evolution require comprehensive phylogenetic analyses and can be assisted by resynthesis of hybrids. In this Special Issue, we include studies ranging in scope from experimental and genomic, through ecological to more theoretical.Conclusions The success of polyploidy, displacing the diploid ancestors of almost all plants, is well illustrated by the huge angiosperm diversity that is assumed to originate from recurrent polyploidization events. Strikingly, polyploidization often occurred prior to or simultaneously with major evolutionary transitions and adaptive radiation of species, supporting the concept that polyploidy plays a predominant role in bursts of adaptive speciation. Polyploidy results in immediate genetic redundancy and represents, with the emergence of new gene functions, an important source of novelty. Along with recombination, gene mutation, transposon activity and chromosomal rearrangement, polyploidy and whole-genome duplication act as drivers of evolution and divergence in plant behaviour and gene function, enabling diversification, speciation and hence plant evolution.

History

Citation

Annals of Botany, 2017, 120 (2), pp. 183-194

Author affiliation

/Organisation/COLLEGE OF MEDICINE, BIOLOGICAL SCIENCES AND PSYCHOLOGY/MBSP Non-Medical Departments/Department of Genetics

Version

AM (Accepted Manuscript)

Published in

Annals of Botany

Publisher

Oxford University Press (OUP) for Annals of Botany Company

issn

0305-7364

eissn

1095-8290

Acceptance date

31/05/2017

Copyright date

2017

Available date

13/07/2018

Publisher version

https://academic.oup.com/aob/article-lookup/doi/10.1093/aob/mcx079

Notes

The file associated with this record is under embargo until 12 months after publication, in accordance with the publisher's self-archiving policy. The full text may be available through the publisher links provided above.;Erratum: http://hdl.handle.net/2381/40829 https://academic.oup.com/aob/article/120/4/619/4070500

Language

en

Usage metrics

Categories

Keywords

Exports