JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2021, Vol. 45 ›› Issue (1): 63-69.doi: 10.12302/j.issn.1000-2006.202004049

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Genetic diversity analysis among natural populations of Quercus fabri based on SSR markers

ZANG Mingyue(), LI Xuan, FANG Yanming*()   

  1. Co-Innovation Center for the Sustainable Forestry in Southern China, Key Laboratory of National Administration of Forestry and Grassland on Subtropical Forest Biodiversity Conservation, College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, China
  • Received:2020-04-25 Accepted:2020-07-10 Online:2021-01-30 Published:2021-02-01
  • Contact: FANG Yanming E-mail:986084166@qq.com;jwu4@njfu.com.cn

Abstract:

【Objective】 This study used simple-sequence repeat (SSR) markers to analyze the genetic diversity on Quercus fabri Hance from natural populations. The study provides important advice concerning the reasonable exploitation and utilization of this resource. 【Method】 The analysis of the genetic diversity and genetic structure of Q. fabri was performed using screened SSR molecular markers. The genetic parameters were calculated and the principal coordinate analysis was applied based on the genetic distance among individuals. The analysis of molecular variance was conducted using Arlequin software. GenAlEx 6.5 was used to test the correlation between the genetic distance and geographic distance. MEGA 7 was used for the UPGMA phylogenetic analysis, and Structure was employed to perform the Bayesian clustering analysis to explore the genetic structure. 【Result】 A total of 75 alleles were detected from six markers. The average number of effective alleles, observed heterozygosity, and expected heterozygosity were 7.16, 0.70 and 0.80, respectively. The Shannon’s information index was 2.05. AMOVA demonstrated that the genetic variation within populations (97.41%) accounted for the main percentage, with a negligible variation among populations (2.59%). The gene flow between Huangshan Mountain (YM) and Tianmushan Mountain (TM) was 12.908, which was much higher than that among other populations, and the genetic distance between the two populations was the closest (0.272). The results of the Bayesian clustering analysis were in accordance with the result of the UPGMA phylogenetic analysis, in that samples from the YM and TM populations had closer phylogenetic relationships. 【Conclusion】 There was a high and coincident level of genetic diversity among natural populations of Q. fabri. The genetic communication between YM and TM was the most frequent, and the genetic variation between these two spots was minor. For Q. fabri, the heritable variation within populations accounted for the majority of genetic variation. When collecting germplasm resources for the genetic improvement of this species, we should avoid unreasonable artificial exploitation. In addition, insitu conservation should be taken into consideration.

Key words: Quercus fabri Hance, simple-sequence repeats (SSR), genetic diversity, genetic structure

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