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Divergence in hormone signalling links local adaptation and hybrid failure

Melanie Joy Wilkinson, Federico Roda, Gregory Matthew Walter, Rick Nipper, Jessica Walsh, Scott Allen, Diana Marcela Bernal, Henry North, Christine Beveridge, View ORCID ProfileDaniel Ortiz-Barrientos
doi: https://doi.org/10.1101/845354
Melanie Joy Wilkinson
The University of Queensland;
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  • For correspondence: melanie.wilkinson@uqconnect.edu.au
Federico Roda
The University of Queensland;
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Gregory Matthew Walter
The University of Queensland;
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  • For correspondence: g.walter@bristol.ac.uk
Rick Nipper
Floragenex
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  • For correspondence: rick@floragenex.com
Jessica Walsh
Floragenex
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  • For correspondence: jwalsh@floragenex.com
Scott Allen
The University of Queensland;
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  • For correspondence: scottlallen@outlook.com
Diana Marcela Bernal
The University of Queensland;
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  • For correspondence: diana.bernal@uqconnect.edu.au
Henry North
The University of Queensland;
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Christine Beveridge
The University of Queensland;
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  • For correspondence: c.beveridge@uq.edu.au
Daniel Ortiz-Barrientos
The University of Queensland;
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  • ORCID record for Daniel Ortiz-Barrientos
  • For correspondence: d.ortizbarrientos@uq.edu.au
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Abstract

Natural selection is a major driver for the origins of adaptations and new species. Whether or not the processes driving adaptation and speciation share a molecular basis remains largely unknown. Here, we show that divergence in hormone signalling contributed to the evolution of complex adaptations and intrinsic reproductive isolation in the Australian wildflower Senecio lautus. We provide evidence that differences in the auxin pathway, a hormone required for plant growth and development, has led to the repeated evolution of erect and prostrate forms along the Australian coast. Using multiple hybrid and natural populations, we show that adjacent erect and prostrate populations repeatedly diverged in auxin-related genes and auxin-dependent phenotypes, such as gravitropism. Analysis of a multi-year field selection experiment revealed that variation in fitness of an F10 hybrid population explained variation in gravitropism of their offspring. Genotyping of F11 hybrid individuals with extreme values of gravitropism revealed that variation in some of the most divergent genes explained both 65% of the variation in gravitropism and their probability of producing seed. Together, our results suggest that divergence in hormonal pathways can create a genetic link between rapid adaptation to new environments and the evolution of intrinsic reproductive isolation.

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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 November 17, 2019.
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Divergence in hormone signalling links local adaptation and hybrid failure
Melanie Joy Wilkinson, Federico Roda, Gregory Matthew Walter, Rick Nipper, Jessica Walsh, Scott Allen, Diana Marcela Bernal, Henry North, Christine Beveridge, Daniel Ortiz-Barrientos
bioRxiv 845354; doi: https://doi.org/10.1101/845354
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Divergence in hormone signalling links local adaptation and hybrid failure
Melanie Joy Wilkinson, Federico Roda, Gregory Matthew Walter, Rick Nipper, Jessica Walsh, Scott Allen, Diana Marcela Bernal, Henry North, Christine Beveridge, Daniel Ortiz-Barrientos
bioRxiv 845354; doi: https://doi.org/10.1101/845354

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