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Genetic diversity of the threatened Saussurea dorogostaiskii (Asteraceae) in the Khuvsgul region of Mongolia

  • Nudkhuu NYAMGEREL (Department of Biology and Chemistry, Changwon National University) ;
  • Shukherdorj BAASANMUNKH (Department of Biology and Chemistry, Changwon National University) ;
  • Batlai OYUNTSETSEG (Department of Biology, School of Arts and Sciences, National University of Mongolia) ;
  • Dashzeveg OYUNTSETSEG (Department of Biology, School of Arts and Sciences, National University of Mongolia) ;
  • Joscelyn NORRIS (Rubenstein School of Environment and Natural Resources, University of Vermont) ;
  • Hyeok Jae CHOI (Department of Biology and Chemistry, Changwon National University) ;
  • Gun-Aajav BAYARMAA (Department of Biology, School of Arts and Sciences, National University of Mongolia)
  • Received : 2022.11.15
  • Accepted : 2023.02.27
  • Published : 2023.03.31

Abstract

Saussurea dorogostaiskii Palib. (Asteraceae) is a critically endangered medicinal plant in Mongolia and Russia. We studied the genetic variation of S. dorogostaiskii from three mountains of northern Mongolia. The genetic profile was assessed in 70 individuals from eight populations using five inter-simple sequence repeat markers, producing 53 loci with 96.4% polymorphism across all bands. Shannon's index (I) and Nei's gene diversity (H) value at the species level of S. dorogostaiskii are 0.25 and 0.17, respectively. An AMOVA showed high genetic variation among the populations (22% of populations and 32% of mountains), consistent with the high genetic differentiation (GST = 0.49) and low gene flow (Nm = 0.51) in S. dorogostaiskii populations. Eight populations were clustered into two groups, corresponding to their geographic locations. The low within-population genetic diversity and high genetic differentiation among S. dorogostaiskii populations factor into their endangered designation. This genetic analysis reveals that all populations are equally threatened, and community-based conservation is appropriate for these species.

Keywords

Acknowledgement

Our study was supported by a research project (Population genetic study of Saussurea dorogostaiskii in Khuvsgul region; Grant P2019-3758) of National University of Mongolia, Mongolia, Korea National Arboretum, Republic of Korea (A study on the distribution of vascular plants in Mongolia; Grant KNA1-2-38, 20-5), and the University of Vermont, USA (Ian Worley Award and the Simon Family Public Research Fellowship). We are grateful to Tsegmed Z. for his assistance with the geographical map. We also thank Tumursukh J., Davaasuren B., Byambaa, Batzaya, Nyam-Ochir D., Tsogoo, Darmaabazar U. and UTPAA employees and rangers for their helpful communication assistance during our field study.

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