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Completing the hybridization triangle : the inheritance of genetic incompatibilities during homoploid hybrid speciation in ragworts (Senecio).

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Date
02/2019
Author
Brennan, Adrian C.
Hiscock, Simon J.
Abbott, Richard John
Keywords
Genetic incompatibility
Genetic mapping
Genomic arrangement
Reproductive isolation
Transmission ration distortion
QH301 Biology
QH426 Genetics
DAS
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Abstract
A new homoploid hybrid lineage needs to establish a degree of reproductive isolation from its parent species if it is to persist as an independent entity, but the role hybridization plays in this process is known in only a handful of cases. The homoploid hybrid ragwort species, Senecio squalidus (Oxford ragwort), originated following the introduction of hybrid plants to the UK approximately 320 years ago. The source of the hybrid plants was from a naturally occurring hybrid zone between S. aethnensis and S. chrysanthemifolius on Mount Etna, Sicily. Previous studies of the parent species found evidence for multiple incompatibility loci causing transmission ratio distortion of genetic markers in their hybrid progeny. This study closes the hybridization triangle by reporting a genetic mapping analysis of the remaining two paired cross combinations between S. squalidus and its parents. Genetic maps produced from F2 mapping families were generally collinear but with half of the linkage groups showing evidence of genomic reorganization between genetic maps. The new maps produced from crosses between S. squalidus and each parent showed multiple incompatibility loci distributed across the genome, some of which co-locate with previously reported incompatibility loci between the parents. These findings suggest that this young homoploid hybrid species has inherited a unique combination of genomic rearrangements and incompatibilities from its parents that contribute to its reproductive isolation.
Citation
Brennan , A C , Hiscock , S J & Abbott , R J 2019 , ' Completing the hybridization triangle : the inheritance of genetic incompatibilities during homoploid hybrid speciation in ragworts ( Senecio ). ' , AoB Plants , vol. 11 , no. 1 , ply078 . https://doi.org/10.1093/aobpla/ply078
Publication
AoB Plants
Status
Peer reviewed
DOI
https://doi.org/10.1093/aobpla/ply078
ISSN
2041-2851
Type
Journal article
Rights
© The Authors 2019. Published by Oxford University Press on behalf of the Annals of Botany Company. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
Description
Funding: UK Natural Environment Research Council (NERC) grant NE/D014166/1 (RJA).
Collections
  • University of St Andrews Research
URI
http://hdl.handle.net/10023/17115

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