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Homomorphic ZW chromosomes 1 in a wild strawberry show distinctive recombination heterogeneity but a small sex-determining region

Jacob A Tennessen, Rajanikanth Govindarajulu, Aaron Liston, Tia-Lynn Ashman
doi: https://doi.org/10.1101/029611
Jacob A Tennessen
1Department of Integrative Biology, Oregon State University, Corvallis, OR, USA
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Rajanikanth Govindarajulu
2Department of Biological Sciences, University of Pittsburgh, Pittsburgh, PA, USA
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Aaron Liston
3Department of Botany and Plant Pathology, Oregon State University, Corvallis, OR, USA
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Tia-Lynn Ashman
2Department of Biological Sciences, University of Pittsburgh, Pittsburgh, PA, USA
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Summary

  • Recombination in ancient, heteromorphic sex chromosomes is typically suppressed at the sex-determining region (SDR) and proportionally elevated in the pseudoautosomal region (PAR). However, little is known about recombination dynamics of young, homomorphic plant sex chromosomes.

  • We examine male and female function in crosses and unrelated samples of the dioecious octoploid strawberry Fragaria chiloensis in order to map the small and recently evolved SDR controlling both traits and to examine recombination patterns on the incipient ZW chromosome.

  • The SDR of this ZW system is located within a 280kb window, in which the maternal recombination rate is lower than the paternal. In contrast to the SDR, the maternal PAR recombination rate is much higher than the rates of the paternal PAR or autosomes, culminating in an elevated chromosome-wide rate. W-specific divergence is elevated within the SDR and a single polymorphism is observed in high species-wide linkage disequilibrium with sex.

  • Selection for recombination suppression within the small SDR may be weak, but fluctuating sex ratios could favor elevated recombination in the PAR to remove deleterious mutations on the W. The recombination dynamics of this nascent sex chromosome with a modestly diverged SDR may be typical of other dioecious plants.

Copyright 
The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-NC-ND 4.0 International license.
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Posted March 26, 2016.
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Homomorphic ZW chromosomes 1 in a wild strawberry show distinctive recombination heterogeneity but a small sex-determining region
Jacob A Tennessen, Rajanikanth Govindarajulu, Aaron Liston, Tia-Lynn Ashman
bioRxiv 029611; doi: https://doi.org/10.1101/029611
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Homomorphic ZW chromosomes 1 in a wild strawberry show distinctive recombination heterogeneity but a small sex-determining region
Jacob A Tennessen, Rajanikanth Govindarajulu, Aaron Liston, Tia-Lynn Ashman
bioRxiv 029611; doi: https://doi.org/10.1101/029611

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