Association mapping of agro-morphological traits in European hazelnut (Corylus avellana)
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More than half of European hazelnut (Corylus avellana) production occurs in Turkey. Despite this dominance, the yield of Turkish cultivars has remained stagnant over the past 10 years with Italian yield nearly double that in Turkey. This difference is due to Turkey’s unique cultivation system; hazelnuts are grown in bushy clusters (“ocak” system), not as single trees. Current hazelnut breeding efforts are shifting toward the development of materials for single plant orchards which are much higher yielding; thus, there is a need to explore germplasm for relevant agro-morphological traits and to determine their genetic control. The objectives of this study were to examine data for 44 such traits in 390 hazelnut accessions: 16 cultivars, 232 landraces and 142 wild individuals from nine provinces in Turkey and to map the loci associated with these characteristics using simple sequence repeat markers. Comparison of cultivars, landraces and wild hazelnut accessions revealed the effects of domestication and selection on the crop and indicated that useful alleles for traits such as cropping and reduced alternate bearing may exist in the wild germplasm. A total of 145 quantitative trait loci (QTL) were detected with the largest proportions identified for involucre (26%) and inflorescence (14%) morphology. Several markers co-localized with more than one trait including markers for male catkin abundance which were shared with plant vigor and height. Similarly, markers for female flower abundance co-localized with suckering and alternate bearing. Such markers and their linked QTL should be studied in more detail as they might help breeders select for plant vigor, decreased suckering and increased flower production: traits which will be extremely useful for Turkey’s transition to single plant orchards.
KeywordsFilbert Microsatellites Simple sequence repeats (SSRs) Quantitative trait locus (QTL)
This study was supported by The Scientific and Technological Research Council of Turkey (TUBITAK, Project No. 212T201). We are grateful to Teberdar Çalişkan and Engin Çetiner for phenotypic characterization of the hazelnut material.
AF analyzed results and drafted manuscript; SCÖ generated genotypic data and performed mapping; HIB, SKB and GK provided plant material and phenotypic data; SD and AF devised experiments; AF obtained funding and revised draft. All authors approved of submitted manuscript.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
Data will be available at http://plantmolgen.iyte.edu.tr/data/ upon publication.
- Balık Hİ, Kayalak Balık S, Beyhan N, Erdoğan V (2016) Fındık Çeşitleri (Hazelnut Cultivars). Klasmat Matbaacılık, TrabzonGoogle Scholar
- Beyhan N (2000) Fındığın döllenme biyolojisi. OMÜ Zir Fak Dergisi 15:116–122Google Scholar
- Boccacci P, Botta R, Rovira M (2008) Geentic diversity of hazelnut (Corylus avellana L.) germplasm in northeastern Spain. Hort Sci 43:667–672Google Scholar
- Caliskan T, Cetiner E (1992) Bazi findik cesit ve tiplerinde karakterizasyon calismalari. T.C. Tarim ve Koyisleri Bakanligi, Tarimsal Arastirmalar Genel Mudurlugu, Findik Arastirma Ensitusu Mudurlugu Yayinlar no: 25Google Scholar
- Food and Agriculture Organization of the United Nations, FAOSTAT (2018). http://www.fao.org/faostat/en/#home. Accessed 10 May 2018
- GTHB (Gida Tarım ve Hayvancılık Bakanlığı) (2018) Bitkisel üretim verileri. https://www.tarim.gov.tr/sgb/Belgeler/SagMenuVeriler/BUGEM.pdf. Accessed 10 May 2018
- Gurcan K, Mehlenbacher SA, Botta R, Boccacci P (2010) Development, characterization, segregation and mapping of microsatellite markers for European hazelnut (Corylus avellana L.) from enriched genomic libraries and usefulness in genetic diversity studies. Tree Genet Genomes 6:513–531CrossRefGoogle Scholar
- Norusis MJ (2010) PASW Statistics 18 advanced statistical procedures companion. Prentice Hall Press, Englewood CliffsGoogle Scholar
- Nyssen B, Schmidt UE, Muys B, van der Lei PB, Pyttel P (2016) The history of introduced tree species in Europe in a nutshell. In: Krumm F, Vítková L (eds) Introduced tree species in European forests: opportunities and challenges. European Forest Institute, Joensuu, pp 44–54Google Scholar
- Oregon Hazelnuts (2018) Production. http://oregonhazelnuts.org/about/production/. Accessed 1 Aug 2018
- Pop F, Pamfil D, Raica PA, Petricele IV, Botu M, Vicol AC, Harta M, Sisea CR (2010) Evaluation of the genetic diversity of several Corylus avellana accessions from the Romanian National Hazelnut Collection. Not Bot Hort Agrobot Cluj 38:61–67Google Scholar
- Thompson MM, Lagerstedt HB, Mehlenbacher SA (1996) Hazelnuts. In: Janick J, Moore JN (eds) Fruit breeding. Nuts, vol 3. Wiley, New York, pp 125–184Google Scholar
- UPOV (International Union for the Protection of New Varieties of Plants) (1979) Hazelnut (Corylus avellana L. and Corylus maxima Mill.): guidelines for the conduct of tests for distinctness, uniformity and stability. Hazelnut/Noisetier/Haselnuss, 79-03-28. Doc. No. TG/71/3. UPOV, GenevaGoogle Scholar