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Genetic diversity assessment and ex situ conservation strategy of the endangered Dendrobium officinale (Orchidaceae) using new trinucleotide microsatellite markers

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Abstract

Dendrobium officinale (Orchidaceae) is an endangered plant species with important medicinal value. To evaluate the effectiveness of ex situ collection of D. officinale genetic diversity, we developed 15 polymorphic trinucleotide microsatellite loci of D. officinale to examine the genetic diversity and structure of three D. officinale germplasm collections comprising 120 individuals from its germplasm collection base and their respective wild populations consisting of 62 individuals from three provinces in China. The three germplasm collections showed reductions in gene diversity and average number of alleles per locus, but an increase in average number of rare alleles (frequency ≤ 0.05) per locus in comparison to their wild populations. However, the differences in gene diversity between the germplasm collections and wild populations were not statistically significant. The analysis using STRUCTURE revealed evident differences in genetic composition between each germplasm collection and its wild population, probably because the D. officinale individuals with distinct genotypes in each wild population were unevenly selected for establishing its germplasm collection. For conservation management plans, we propose that D. officinale individuals with rare alleles need to be conserved with top priority, and those individuals with the most common alleles also should be concerned. The 15 new microsatellite loci may be used as a powerful tool for further evaluation and conservation of the genetic diversity of D. officinale germplasm resources.

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Acknowledgments

We are grateful to Shu-Miaw Chaw for many helpful comments on previous drafts. This work was financed by the National Natural Science Foundation of China (no. 30870234) and the Natural Science Foundation of Jiangsu Province (no. BK2008431).

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Authors and Affiliations

  1. College of Life Sciences, Nanjing Normal University, No. 1, Wenyuan Road, Nanjing, 210046, China

    Beiwei Hou, Min Tian, Jing Luo, Yuan Ji, Qingyun Xue & Xiaoyu Ding

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  1. Beiwei Hou
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  2. Min Tian
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  3. Jing Luo
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  4. Yuan Ji
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  5. Qingyun Xue
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  6. Xiaoyu Ding
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Correspondence to Xiaoyu Ding.

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Hou, B., Tian, M., Luo, J. et al. Genetic diversity assessment and ex situ conservation strategy of the endangered Dendrobium officinale (Orchidaceae) using new trinucleotide microsatellite markers. Plant Syst Evol 298, 1483–1491 (2012). https://doi.org/10.1007/s00606-012-0651-3

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  • DOI: https://doi.org/10.1007/s00606-012-0651-3

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