A 15-Myr-old genetic bottleneck

Molecular Biology and Evolution
Timothy PaapeJoshua R Kohn

Abstract

Balancing selection preserves variation at the self-incompatibility locus (S-locus) of flowering plants for tens of millions of years, making it possible to detect demographic events that occurred prior to the origin of extant species. In contrast to other Solanaceae examined, SI species in the sister genera Physalis and Witheringia share restricted variation at the S-locus. This restriction is indicative of an ancient bottleneck that occurred in a common ancestor. We sequenced 14 S-alleles from the subtribe Iochrominae, a group that is sister to the clade containing Physalis and Witheringia. At least 6 ancient S-allele lineages are represented among these alleles, demonstrating that the Iochrominae taxa do not share the restriction in S-locus diversity. Therefore, the bottleneck occurred after the divergence of the Iochrominae from the lineage leading to the most recent common ancestor of Physalis and Witheringia. Using cpDNA sequences, 3 fossil dates, and a Bayesian-relaxed molecular clock approach, the crown group of Solanaceae was estimated to be 51 Myr old and the restriction of variation at the S-locus occurred 14.0-18.4 Myr before present. These results confirm the great age of polymorphism at the S-locus and the utility...Continue Reading

Citations

Feb 9, 2012·Proceedings of the National Academy of Sciences of the United States of America·Ruiqi HuangTodd J Barkman
Nov 17, 2012·Molecular Biology and Evolution·Stacey D SmithMark D Rausher
Sep 9, 2008·The Plant Cell·Ed NewbiginJoshua R Kohn
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Apr 26, 2011·Genetics·Camille E GervaisSylvain Billiard
Dec 5, 2012·Evolution; International Journal of Organic Evolution·Emma E Goldberg, Boris Igić
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Mar 31, 2021·American Journal of Botany·Andrew R Raduski, Boris Igić

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