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Genetic diversity and domestication of hazelnut (Corylus avellana) in Turkey

Andrew J. Helmstetter, Nihal Oztolan-Erol, Stuart J. Lucas, Richard J. A. Buggs
doi: https://doi.org/10.1101/622027
Andrew J. Helmstetter
1Jodrell Laboratory, Royal Botanic Gardens, Kew, Richmond, Surrey, TW9 3AB, UK
2Institut de Recherche pour le Développement (IRD), UMR-DIADE, Montpellier, France
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  • For correspondence: andrew.j.helmstetter@gmail.com
Nihal Oztolan-Erol
3Sabanci University Nanotechnology Research and Application Center (SUNUM), Sabanci University, Orhanli, 34956 Tuzla, Istanbul, Turkey
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Stuart J. Lucas
3Sabanci University Nanotechnology Research and Application Center (SUNUM), Sabanci University, Orhanli, 34956 Tuzla, Istanbul, Turkey
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Richard J. A. Buggs
1Jodrell Laboratory, Royal Botanic Gardens, Kew, Richmond, Surrey, TW9 3AB, UK
4School of Biological and Chemical Sciences, Queen Mary University of London, London E1 4NS, UK
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SUMMARY

  • Assessing and describing genetic diversity in crop plants is a crucial first step towards their improvement. The European hazelnut, Corylus avellana, is one of the most economically important tree nut crops worldwide. It is primarily produced in Turkey where rural communities depend on it for their livelihoods. Despite this we know little about hazelnut’s domestication history and the genetic diversity it holds.

  • We use double digest Restriction-site Associated DNA (ddRAD) sequencing to produce genome-wide dataset containing wild and domesticated hazelnut. We uncover patterns of population structure and diversity, determine levels of crop-wild gene flow and estimate the timing of key divergence events.

  • We find that genetic clusters of cultivars do not reflect their given names and that there is limited evidence for a reduction in genetic diversity in domesticated individuals. Admixture has likely occurred multiple times between wild and domesticated hazelnut. Domesticates appear to have first diverged from their wild relatives during the Mesolithic.

  • We provide the first genomic assessment of Turkish hazelnut diversity and suggest that it is currently in a partial stage of domestication. Our study provides a platform for further research that will protect this crop from the threats of climate change and an emerging fungal disease.

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 April 30, 2019.
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Genetic diversity and domestication of hazelnut (Corylus avellana) in Turkey
Andrew J. Helmstetter, Nihal Oztolan-Erol, Stuart J. Lucas, Richard J. A. Buggs
bioRxiv 622027; doi: https://doi.org/10.1101/622027
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Genetic diversity and domestication of hazelnut (Corylus avellana) in Turkey
Andrew J. Helmstetter, Nihal Oztolan-Erol, Stuart J. Lucas, Richard J. A. Buggs
bioRxiv 622027; doi: https://doi.org/10.1101/622027

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