Reconstructing origins of loss of self-incompatibility and selfing in North American Arabidopsis lyrata: a population genetic context

Foxe, J.P., Stift, M., Tedder, A., Haudry, A., Wright, S.I. and Mable, B.K. (2010) Reconstructing origins of loss of self-incompatibility and selfing in North American Arabidopsis lyrata: a population genetic context. Evolution, 64(12), pp. 3495-3510. (doi:10.1111/j.1558-5646.2010.01094.x)

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Abstract

Theoretical and empirical comparisons of molecular diversity in selfing and outcrossing plants have primarily focused on long-term consequences of differences in mating system (between species). However, improving our understanding of the causes of mating system evolution requires ecological and genetic studies of the early stages of mating system transition. Here, we examine nuclear and chloroplast DNA sequences and microsatellite variation in a large sample of populations of Arabidopsis lyrata from the Great Lakes region of Eastern North American that show intra- and interpopulation variation in the degree of self-incompatibility and realized outcrossing rates. Populations show strong geographic clustering irrespective of mating system, suggesting that selfing either evolved multiple times or has spread to multiple genetic backgrounds. Diversity is reduced in selfing populations, but not to the extent of the severe loss of variation expected if selfing evolved due to selection for reproductive assurance in connection with strong founder events. The spread of self-compatibility in this region may have been favored as colonization bottlenecks following glaciation or migration from Europe reduced standing levels of inbreeding depression. However, our results do not suggest a single transition to selfing in this system, as has been suggested for some other species in the Brassicaceae.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Haudry, Dr Annabelle and Mable, Professor Barbara and Stift, Mr Marc
Authors: Foxe, J.P., Stift, M., Tedder, A., Haudry, A., Wright, S.I., and Mable, B.K.
College/School:College of Medical Veterinary and Life Sciences > Institute of Biodiversity Animal Health and Comparative Medicine
Journal Name:Evolution
ISSN:0014-3820
ISSN (Online):1558-5646
Published Online:30 July 2010

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
442951Leveraging the genome sequences of two arabidopsis relatives for evolutionary and ecological genomicsBarbara MableBiotechnology and Biological Sciences Research Council (BBSRC)BB/E024734/1Institute of Biodiversity Animal Health and Comparative Medicine
426221Mating systems and genetic diversity in Arabidopsis lyrataBarbara MableNatural Environment Research Council (NERC)NE/D013461/1Institute of Biodiversity Animal Health and Comparative Medicine