Disentangling the effects of breakdown of self-incompatibility and transition to selfing in North American Arabidopsis lyrata

Haudry, Annabelle; Zha, Hong Guang; Stift, Marc; Mable, Barbara

Disentangling the effects of breakdown of self-incompatibility and transition to selfing in North American Arabidopsis lyrata

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Datum

2012

Autor:innen

Haudry, Annabelle

Zha, Hong Guang

Stift, Marc

Mable, Barbara

Publikationstyp

Zeitschriftenartikel

Publikationsstatus

Published

Erschienen in

Molecular Ecology. 2012, 21(5), pp. 1130-1142. ISSN 0962-1083. eISSN 1365-294X. Available under: doi: 10.1111/j.1365-294X.2011.05435.x

Zusammenfassung

A breakdown of self-incompatibility (SI) followed by a shift to selfing is commonly observed in the evolution of flowering plants. Both are expected to reduce the levels of heterozygosity and genetic diversity. However, breakdown of SI should most strongly affect the region of the SI locus (S-locus) because of the relaxation of balancing selection that operates on a functional S-locus, and a potential selective sweep. In contrast, a transition to selfing should affect the whole genome. We set out to disentangle the effects of breakdown of SI and transition to selfing on the level and distribution of genetic diversity in North American populations of Arabidopsis lyrata. Specifically, we compared sequence diversity of loci linked and unlinked to the S-locus for populations ranging from complete selfing to fully outcrossing. Regardless of linkage to the S-locus, heterozygosity and genetic diversity increased with population outcrossing rate. High heterozygosity of self-compatible individuals in outcrossing populations suggests that SI is not the only factor preventing the evolution of self-fertilization in those populations. There was a strong loss of diversity in selfing populations, which was more pronounced at the S-locus. In addition, selfing populations showed an accumulation of derived mutations at the S-locus. Our results provide evidence that beyond the genome-wide consequences of the population bottleneck associated with the shift to selfing, the Slocus of A. lyrata shows a specific signal either reflecting the relaxation of balancing selection or positive selection.

Fachgebiet (DDC)

570 Biowissenschaften, Biologie

Schlagwörter

balancing selection, mating system evolution, self-incompatibility, S-locus

Zitieren

ISO 690

HAUDRY, Annabelle, Hong Guang ZHA, Marc STIFT, Barbara MABLE, 2012. Disentangling the effects of breakdown of self-incompatibility and transition to selfing in North American Arabidopsis lyrata. In: Molecular Ecology. 2012, 21(5), pp. 1130-1142. ISSN 0962-1083. eISSN 1365-294X. Available under: doi: 10.1111/j.1365-294X.2011.05435.x

BibTex

@article{Haudry2012-03Disen-19508,
  year={2012},
  doi={10.1111/j.1365-294X.2011.05435.x},
  title={Disentangling the effects of breakdown of self-incompatibility and transition to selfing in North American Arabidopsis lyrata},
  number={5},
  volume={21},
  issn={0962-1083},
  journal={Molecular Ecology},
  pages={1130--1142},
  author={Haudry, Annabelle and Zha, Hong Guang and Stift, Marc and Mable, Barbara}
}

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