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Non-reciprocal Interspecies HybridizationBarriers in the Capsella Genus Are Establishedin the Endosperm

Rebernig, Carolin A. and Lafon-Placette, Clément and Hatorangan, Marcelinus R. and Slotte, Tanja (2015). Non-reciprocal Interspecies HybridizationBarriers in the Capsella Genus Are Establishedin the Endosperm. PLoS genetics. 11:6, 1-19
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Official URL: http://dx.doi.org/10.1371/journal. pgen.1005295

Abstract

The transition to selfing in Capsella rubella accompanies its recent divergence from the ancestral outcrossing C. grandiflora species about 100,000 years ago. Whether the change in mating system was accompanied by the evolution of additional reproductive barriers that enforced species divergence remained unknown. Here, we show that C. rubella and C. grandiflora are reproductively separated by an endosperm-based, non-reciprocal postzygotic hybridization barrier. While hybridizations of C. rubella maternal plants with C. grandiflora pollen donors resulted in complete seed abortion caused by endosperm cellularization failure, the reciprocal hybridization resulted in the formation of small seeds with precociously cellularized endosperm. Strikingly, the transcriptomic response of both hybridizations mimicked respectively the response of paternal and maternal excess hybridizations in Arabidopsis thaliana, suggesting unbalanced genome strength causes hybridization failure in both species. These results provide strong support for the theory that crosses between plants of different mating systems will be unbalanced, with the outcrosser behaving like a plant of increased ploidy, evoking a response that resembles an interploidy-type seed failure. Seed incompatilibity of C. rubella pollinated by C. grandiflora followed the Bateson- Dobzhansky-Muller model, involving negative genetic interaction of multiple paternal C. grandiflora loci with at least one maternal C. rubella locus. Given that both species only recently diverged, our data suggest that a fast evolving mechanism underlies the post-zygotic hybridization barrier(s) separating both species.

Authors/Creators:Rebernig, Carolin A. and Lafon-Placette, Clément and Hatorangan, Marcelinus R. and Slotte, Tanja
Title:Non-reciprocal Interspecies HybridizationBarriers in the Capsella Genus Are Establishedin the Endosperm
Series/Journal:PLoS genetics (1553-7404)
Year of publishing :2015
Volume:11
Number:6
Page range:1-19
Publisher:Public Library of Science
ISSN:1553-7404
Language:English
Publication Type:Journal article
Refereed:Yes
Article category:Scientific peer reviewed
Version:Published version
Full Text Status:Public
Agris subject categories.:F Plant production > F30 Plant genetics and breeding
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 404 Agricultural Biotechnology > Genetics and Breeding
Agrovoc terms:genetics, hybridization, Capsella
Keywords:Capsella rubella, Capsella grandiflora, hybridization, evolution, mating systems, genetics
URN:NBN:urn:nbn:se:slu:epsilon-e-4378
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-4378
ID Code:14583
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Department of Plant Biology (from 140101)
Deposited By: Jenny Casey Eriksson
Deposited On:27 Sep 2017 07:23
Metadata Last Modified:27 Sep 2017 07:23

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