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Heterosis in hybrids within and between yeast species.

Bernardes, JP; Stelkens, RB; Greig, D; (2017) Heterosis in hybrids within and between yeast species. Journal of Evolutionary Biology , 30 (3) pp. 538-548. 10.1111/jeb.13023. Green open access

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Abstract

The performance of hybrids relative to their parents is an important factor in speciation research. We measured the growth of 46 Saccharomyces yeast F1 interspecific and intraspecific hybrids, relative to the growth of each of their parents, in pairwise competition assays. We found that the growth of a hybrid relative to the average of its parents, a measure of mid-parent heterosis, correlated with the difference in parental growth relative to their hybrid, a measure of phenotypic divergence, which is consistent with simple complementation of low fitness alleles in one parent by high fitness alleles in the other. Interspecific hybrids showed stronger heterosis than intraspecific hybrids. To manipulate parental phenotypic divergence independently of genotype, we also measured the competitive growth of a single interspecific hybrid relative to its parents in 12 different environments. In these assays, we not only identified a strong relationship between parental phenotypic divergence and mid-parent heterosis as before, but, more tentatively, a weak relationship between phenotypic divergence and best-parent heterosis, suggesting that complementation of deleterious mutations was not the sole cause of interspecific heterosis. Our results show that mating between different species can be beneficial, and demonstrate that competition assays between parents and offspring are a useful way to study the evolutionary consequences of hybridization.

Type: Article
Title: Heterosis in hybrids within and between yeast species.
Location: Switzerland
Open access status: An open access version is available from UCL Discovery
DOI: 10.1111/jeb.13023
Publisher version: http://dx.doi.org/10.1111/jeb.13023
Language: English
Additional information: © 2016 The Authors. Journal of Evolutionary Biology Published by John Wiley & sons Ltd on Behalf of European Society for Evolutionary Biology This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Keywords: Saccharomyces cerevisiae, Saccharomyces paradoxus, F1 hybrid, heterosis, hybrid vigour, speciation
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences > Genetics, Evolution and Environment
URI: http://discovery.ucl.ac.uk/id/eprint/1538028
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