Divergence in hormone signaling drives local adaptation and intrinsic reproductive isolation
Melanie J Wilkinson,
Greg M. Walter,
Maddie E. James,
Scott L Allen,
Diana M. Bernal,
Henry L. North,
Posted 17 Nov 2019
bioRxiv DOI: 10.1101/845354
Posted 17 Nov 2019
Natural selection is a major driver of both adaptation and speciation. Whether or not the processes driving adaptation and speciation share a molecular basis remains largely unknown. Here, we show that divergence in hormone signaling contributed to the evolution of complex adaptations and intrinsic reproductive isolation in an Australian wildflower, Senecio lautus. We provide evidence that differences in the auxin pathway, a hormone signaling pathway required for plant growth and development, has led to the repeated evolution of erect and prostrate forms to contrasting coastal environments. Using multiple hybrid and natural populations, we show that adjacent erect and prostrate populations have repeatedly diverged in auxin-related genes and auxin-dependent phenotypes, such as gravitropism. Analysis of an advanced hybrid population in a multi-year field selection experiment revealed that high fitness families produce offspring with the local gravitropic response. We found that two auxin-related genes explained 45% of the variation in gravitropism in hybrid individuals. Remarkably, crossing hybrid individuals with extreme differences in gravitropism significantly reduces their ability to produce seed, showing gravitropism is genetically correlated with intrinsic reproductive isolation. Together, our results suggest that divergence in hormonal pathways can drive rapid adaptation to contrasting environments and to the origin of new species. ### Competing Interest Statement The authors have declared no competing interest.
- Downloaded 371 times
- Download rankings, all-time:
- Site-wide: 43,363 out of 88,741
- In evolutionary biology: 2,988 out of 5,430
- Year to date:
- Site-wide: 22,586 out of 88,741
- Since beginning of last month:
- Site-wide: 21,689 out of 88,741
Downloads over time
Distribution of downloads per paper, site-wide
- 18 Dec 2019: We're pleased to announce PanLingua, a new tool that enables you to search for machine-translated bioRxiv preprints using more than 100 different languages.
- 21 May 2019: PLOS Biology has published a community page about Rxivist.org and its design.
- 10 May 2019: The paper analyzing the Rxivist dataset has been published at eLife.
- 1 Mar 2019: We now have summary statistics about bioRxiv downloads and submissions.
- 8 Feb 2019: Data from Altmetric is now available on the Rxivist details page for every preprint. Look for the "donut" under the download metrics.
- 30 Jan 2019: preLights has featured the Rxivist preprint and written about our findings.
- 22 Jan 2019: Nature just published an article about Rxivist and our data.
- 13 Jan 2019: The Rxivist preprint is live!