| Alpine plants are particularly susceptible to climate change and environmental variational elevation gradient.Studying the changes of genetic diversity and genetic structure along altitudinal gradient in the alpine areas, will contribute to the understanding of alpine plants response to climate change. In this study, a total of363individuals were sampled from17Abies geogei populations along altitudinal transects in Meili Snow Mountain (MSM) and Jiaozi Snow Mountain (JSM) and Nine microsatellite markers were used to analyze the genetic diversity and population structure of the Abies georgei. The data were analyzed by using GenAlex6.5software, Structure2.2.4, Arlequin3.5.1.2and R3.2.1. The results were summarized as follows:(1) The levels of genetic diversity in Meili Snow Mountain (MSM) population and Jiaozi Snow Mountain (JSM) population were both high, and showed no significant change along altitudinal gradient. For MSM and JSM populations, Shannon index (I) were2.079and1.835; respectively were expected heterozygosity (He) were0.822and0.788, respectively; number of effective alleles (Ne):6.854and5.782, respectively.(2)There were no significant genetic differentiation among populations along altitudinal gradient both in Meili Snow Mountain and Jiaozi Snow Mountain. The genetic differentiation coefficients (Fst) were0.043and0.083, respectively. The gene flows (Nm) among populations in those two areas were nearly6.0, thereby reducing the genetic differentiation among populations.(3) There were significant genetic differentiation between Meili Snow Mountain and Jiaozi Snow Mountain. The genetic variation accounted for15%of the total variation and genetic differentiation coefficient (Fst) was0.106.The Abies georgei of the levels of genetic diversity in Meili Snow Mountain (MSM) population and Jiaozi Snow Mountain (JSM) population were both high.If the climate changed, Abies georgei can quickly adapt to the new environment. |
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