Adaptive introgression of herbivore resistance traits in the weedy sunflower Helianthus annuus

The American Naturalist
Kenneth D WhitneyLoren H Rieseberg

Abstract

The role of hybridization in adaptive evolution is contentious. While many cases of adaptive trait introgression have been proposed, the relevant traits have rarely been identified, resulting in a lack of clear examples of this process. Here, we examine a purported case of adaptive introgression in which the annual sunflower Helianthus annuus annuus has captured alleles from a congener (Helianthus debilis) to form a stabilized hybrid, Helianthus annuus texanus. We tested the hypotheses that herbivore resistance traits have introgressed from H. debilis to H. annuus and have increased adaptation in the latter. In two common gardens, fitness (estimated by seed production) was on average 55% higher in H. a. texanus than in H. a. annuus. For H. a. texanus, three damage traits (of seven tested) differed significantly from the H. a. annuus parent in one or both sites and were shifted in the direction of the more resistant H. debilis. Natural selection favored H. a. annuusxH. debilis BC(1) hybrids (synthesized to mimic the ancestors of H. a. texanus) with H. debilis-like resistance to seed midges Neolasioptera helianthis and to receptacle/seed feeding Lepidoptera at one or both sites. Assuming similar herbivore pressures in the past, t...Continue Reading

References

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Jul 28, 2004·The American Naturalist·Briana L GrossLoren H Rieseberg

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Citations

Feb 13, 2010·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Xiaoling SongSheng Qiang
Jun 10, 2011·Oecologia·Christine KrebsUrs Schaffner
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Dec 28, 2011·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Jared L StrasburgLoren H Rieseberg
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Sep 5, 2008·PLoS Genetics·Vincent CastricXavier Vekemans
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Mar 5, 2014·Briefings in Functional Genomics·Michael B KantarLoren H Rieseberg
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Feb 28, 2016·Genome Biology·Wei ZhangMarcus R Kronforst
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