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First published online January 15, 2010; doi:10.3732/ajb.0900224
American Journal of Botany 97: 298-302 (2010)
© 2010 Botanical Society of America, Inc.
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Population Biology

Does selfing or outcrossing promote local adaptation?1

Joe Hereford2

National Evolutionary Synthesis Center, Durham, North Carolina 27705 USA; and University of Maryland, Department of Biology, College Park, Maryland 20742 USA

ABSTRACT

The degree to which plants self-fertilize may impact their potential for genetic adaptation. Given that the mating system influences genetic processes within and among populations, the mating system could limit or promote local adaptation. I conducted a literature survey of published reciprocal transplant experiments in plant populations to quantify the effect of mating system on the magnitude of local adaptation. Mating system had no effect on local adaptation. I detected no effect when species were categorized as either self-compatible or self-incompatible or when accounting for environmental differences between source populations. The results suggest that, despite limited genetic variation in selfing species and greater potential for gene flow in outcrossing species, mating system has little influence on adaptation of populations.

Key Words: fitness • genotype by environment interaction • meta-analysis • natural selection • reciprocal transplant • self-compatibility

Received for publication 29 July 2009. Accepted for publication 16 November 2009.

FOOTNOTES

1 The author thanks J. Kingsolver for advice on the execution of this project. A. A. Winn provided useful suggestions for the execution and writing of this study. M. Neel gave valuable comments on a previous version of the paper. Data on the outcrossing rates of many species was obtained with the help of C. G. Eckert. The author is grateful for valuable comments from C. Goodwillie and two anonymous reviewers on a previous version of the manuscript. This study was funded by National Science Foundation grant EF-0423641 to the National Evolutionary Synthesis Center, and National Science Foundation grant DBI - 0610415 to J. Hereford.

2 Author for correspondence (e-mail: hereford{at}umd.edu); present address: Department of Plant Science and Landscape Architecture, University of Maryland, College Park, MD 20742 USA


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