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Originally published as Genetics Published Articles Ahead of Print on August 24, 2007.

Genetics, Vol. 177, 1141-1150, October 2007, Copyright © 2007
doi:10.1534/genetics.107.076851

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A Genomewide Study of Reproductive Barriers Between Allopatric Populations of a Homosporous Fern, Ceratopteris richardii

Takuya Nakazato*,1, Min-Kyung Jung{dagger}, Elizabeth A. Housworth{dagger}, Loren H. Rieseberg*,{ddagger} and Gerald J. Gastony*

* Department of Biology and {dagger} Department of Mathematics, Indiana University, Bloomington, Indiana 47405 and {ddagger} Department of Botany, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada

1 Corresponding author: Department of Biology, Indiana University, 1001 E. Third St., Bloomington, IN 47405-7005.
E-mail: tnakazat{at}indiana.edu

Biological factors involved in reproductive barriers between two divergent races of Ceratopteris richardii were investigated. We used a combination of spore germination rates, QTL analysis of spore germination rates, and transmission ratio distortion (TRD) of 729 RFLPs, AFLPs, and isozyme markers distributed across the genome on the basis of hybrid populations of 488 doubled haploid lines (DHLs) and 168 F2's. Substantial reproductive barriers were found between the parental races, predominantly in the form of spore inviability (23.7% F1 spore viability). Intrinsic genetic factors such as Bateson–Dobzhansky–Muller (BDM) incompatibilities involving both nuclear–nuclear and nuclear–cytoplasmic factors and chromosomal rearrangements appear to contribute to intrinsic postzygotic isolation. The genomewide distribution patterns of TRD loci support the hypothesis that reproductive barriers are a byproduct of divergence in allopatry and that the strong reproductive barriers are attributable to a small number of genetic elements scattered throughout the genome.


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