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doi:10.1534/genetics.107.076851
A more recent version of this article appeared on October 1, 2007.
REGULAR RESEARCH PAPERS |
A genome-wide study of reproductive barriers between allopatric populations of a homosporous fern, Ceratopteris richardii
Takuya Nakazato 1*, Min-Kyung Jung 1, Elizabeth Ann Housworth 1, Loren Riesenberg 2 and Gerald Jerry Gastony 1
1 Indiana University
2 University of British Columbia
* To whom correspondence should be addressed. E-mail: tnakazat{at}indiana.edu.
Submitted on May 29, 2007
Revised on July 20, 2007
Accepted on 31 July 2007
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 RFLP, AFLP, and isozyme markers distributed across the genome based on hybrid populations of 488 doubled haploid lines (DHLs) and 168 F2s. 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, chromosomal rearrangements, and meiotic drive appear to contribute to intrinsic postzygotic isolation. The genome-wide 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.
Key Words: Ceratopteris richardii, QTL, homosporous fern, reproductive isolation, transmission ratio distortion
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