Genetic diversity and population structure of the endangered conifer Taxus wallichiana var. mairei (Taxaceae) revealed by Simple Sequence Repeat (SSR) markers |
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| Affiliation: | 1. College of pharmacy and chemistry, Dali University, Dali, Yunnan 671000, PR China;2. College of Life Science and Engineering, Chongqing Three Gorges University, Chongqing 404000, PR China;1. Department of Agricultural, Food and Environmental Sciences, Polytechnic University of Marche, Via delle Brecce Bianche 10, I-60131 Ancona, Italy;2. Department of Natural Resources and Environmental Science, University of Nevada Reno, 1664 N. Virginia St., Reno, NV 89557, USA;3. State Forestry Service (CFS) Corps – Province Headquarter, Viale Croce Benedetto 47, I-63100 Ascoli Piceno, Italy;1. Forest Genetics and Forest Tree Breeding, Georg-August-University Göttingen, Germany;2. School of Forest Resources and Environmental Science, Michigan Technological University, USA;3. Institute of Systematic Botany with Herbarium Haussknecht and Botanical Garden, Friedrich-Schiller-University Jena, Germany;1. Ningbo City College of Vocational Technology, Ningbo 315000, Zhejiang, China;2. Key Laboratory of Plant Germplasm Enhancement and Speciality Agriculture, Wuhan Botanical Garden, The Chinese Academy of Sciences, Wuhan 430074, Hubei, China |
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| Abstract: | Taxus wallichiana var. mairei is an endangered conifer with important medicinal value in southern China. Nuclear SSR markers were employed to assess genetic diversity and structure of 13 geographically disjunct populations. The present study revealed a moderate genetic diversity (HE = 0.538) and low genetic differentiation (FST = 0.159). And most populations encountered in severe inbreeding and bottleneck effect. No significant genetic structure was detected by IBD and Structure analysis, which was supported by AMOVA analysis. The present results could be ascribed to an earlier period of more pronounced gene flow when the species had a more continuous distribution. However, the 13 studied populations were divided into four clusters based on the UPGMA dendrogram; these clusters were almost congruent with their geographical distributions. Vital areas such as southern mountains of Sichuan basin, Nanling Mts. and the margin of this yew's distribution range had a high priority for conservation. |
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| Keywords: | SSR markers Genetic diversity Genetic structure Endangered plant |
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