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To what extent do wild apples in Kazakhstan retain their genetic integrity?

  • Madina Y. Omasheva
  • Henryk Flachowsky
  • Natalya A. Ryabushkina
  • Alexandr S. Pozharskiy
  • Nurbol N. Galiakparov
  • Magda-Viola Hanke
Original Article
Part of the following topical collections:
  1. Gene Conservation

Abstract

Kazakhstan belongs to the center of origin of apple. Malus sieversii (Ledeb.) M. Roem., the ancestral progenitor of the cultivated apple is native to this region. Pressure on the natural habitats of this wild apple has been intensified due to agriculture, grazing, and urbanization in the last century. For decades, M. sieversii in Kazakhstan has been subjected to the “Red Book of the Kazakh SSR” and today, this species is threatened with extinction. Wild apple undergoes exceptional losses in habitats, and the risk for losing the genetic integrity becomes worse due to increasing cultivation of cultivated apples and frequently occurring crosspollination events. The present study was focused on the current state of M. sieversii in Kazakhstan, the level of its diversity, its genetic integrity, and the identification of regions where future activities for conservation will have a good chance of success. A total of 311 M. sieversii samples of 12 populations collected in the wild, 16 previously selected wild apple genotypes, and 50 grown cultivars were studied using 16 simple sequence repeat (SSR) markers for genetic analysis. The results suggest that the level of genetic diversity is high. The differentiation between the populations was low, although the within-population heterozygosity was relatively high. A significant number of hybrids (8–95%) between M. sieversii and cultivated apples were found suggesting frequent crop-to-wild gene flow. The percentage of pure wild apple genotypes was highest in Krutoe truct and Tauturgen. These sites should be taken into account for future in situ long-term preservation activities.

Keywords

Malus sieversii Microsatellite markers Genetic diversity Population structure 

Notes

Acknowledgements

The research was funded by the Grant on the subpriority “Fundamental Studies in the Area of Natural Sciences,” Budget Program 101 of the Scientific Committee of the Ministry of Education and Science of the Republic of Kazakhstan (grant no. 1105/GF4). We gratefully acknowledge Dr. S.V. Chekalin for collecting Malus sieversii samples and providing information on the wild apple germplasm. We also acknowledge R. Gläß for her technical assistance and Dr. F.O. Emeriewen for improving the English language of the manuscript.

Data archiving statement

All data are provided in Table S3.

Supplementary material

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Table S1 (DOCX 17 kb)
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Table S2 (DOCX 14 kb)
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Table S3 (XLSX 67 kb)
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Table S4 (DOCX 12 kb)
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Fig. S1 UPGMA dendrogram based on Nei’s (1972) genetic distances calculated from the dataset of 16 SSRs across the 311 wild apple genotypes, 50 cultivars and 16 clones selected by Dzhangaliev using R. notes. TT Tauturgen, AR Almaty reserve, BB Belbulak, GAG Great Almaty gorge, KM Ketmen, TB Tarbagatay, CR Chernoff River, KT Krutoe truct, LRB Lepsy right bank, BG Bozturgay gorge, AD Aksu Dzhabagly, UK Uryukty, MD M. domestica, Dzh Dzhangaliev apples clones. (JPEG 8355 kb)
11295_2017_1134_MOESM6_ESM.jpg (5.7 mb)
Fig. S2 Admixture analyses of the 311 genotypes of M. sieversii, 16 clones selected by Dzhangaliev and 50 being grown in Kazakhstan apple cultivars by Bayesian assignment using the STRUCTURE software with K = 2–5. Each individual is represented as a horizontal bar. Different colors in the same line indicate the individual’s admixture proportion (Q value) in K clusters. (JPEG 5881 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  • Madina Y. Omasheva
    • 1
  • Henryk Flachowsky
    • 2
  • Natalya A. Ryabushkina
    • 1
  • Alexandr S. Pozharskiy
    • 1
  • Nurbol N. Galiakparov
    • 1
  • Magda-Viola Hanke
    • 2
  1. 1.Institute of Plant Biology and BiotechnologyAlmatyKazakhstan
  2. 2.Julius Kühn-Institute, Federal Research Institute for Cultivated Plants, Institute for Breeding Research on Fruit CropsDresdenGermany

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