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Association Mapping in Turkish Olive Cultivars Revealed Significant Markers Related to Some Important Agronomic Traits

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Abstract

Olive (Olea europaea L.) is one of the most important fruit trees especially in the Mediterranean countries due to high consumption of table olive and olive oil. In olive breeding, the phenotypic traits associated to fruit are the key factors that determine productivity. Association mapping has been used in some tree species and a lot of crop plant species, and here, we perform an initial effort to detect marker-trait associations in olive tree. In the current study, a total of 96 olive genotypes, including both oil and table olive genotypes from Turkish Olive GenBank Resources, were used to examine marker-trait associations. For olive genotyping, SNP, AFLP, and SSR marker data were selected from previously published study and association analysis was performed between these markers and 5 yield-related traits. Three different approaches were used to check for false-positive results in association tests, and association results obtained from these models were compared. Using the model utilizing both population structure and relative kinship, eleven associations were significant with FDR ≤ 0.05. The largest number of significant associations was detected for fruit weight and stone weight. Our results suggested that association mapping could be an effective approach for identifying marker-trait associations in olive genotypes, without the development of mapping populations. This study shows for the first time the use of association mapping for identifying molecular markers linked to important traits in olive tree.

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Acknowledgments

We would like to thank Jean-Luc Jannink from Cornell University, Ithaca, NY, USA for many helpful suggestions for improving of this article. Special thanks to Deniz Akdemir and Julio Sanchez, from Cornell University, Ithaca, NY, USA for their helpful discussions. We thank Tugba Keskin Gundogdu from Ege University, Turkey for assistance in phenotypic data evaluation. We are grateful to Gunter Backes from University of Kassel, Germany for kindly sharing his experience in AM.

Funding

This study was funded by Scientific and Technical Research Council of Turkey with the project number 108G096.

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Authors and Affiliations

  1. Department of Bioengineering, Ege University, Izmir, Turkey

    Hilal Betul Kaya & Bahattin Tanyolac

  2. Olive Research Station, Izmir, Turkey

    Oznur Cetin, Hulya Sozer Kaya, Mustafa Sahin & Filiz Sefer

Authors
  1. Hilal Betul Kaya
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  2. Oznur Cetin
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  3. Hulya Sozer Kaya
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  4. Mustafa Sahin
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  5. Filiz Sefer
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  6. Bahattin Tanyolac
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Corresponding author

Correspondence to Bahattin Tanyolac.

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Kaya, H.B., Cetin, O., Kaya, H.S. et al. Association Mapping in Turkish Olive Cultivars Revealed Significant Markers Related to Some Important Agronomic Traits. Biochem Genet 54, 506–533 (2016). https://doi.org/10.1007/s10528-016-9738-9

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  • DOI: https://doi.org/10.1007/s10528-016-9738-9

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