Clonal and genetic diversity of Carex moorcroftii on the Qinghai-Tibet plateau |
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Authors: | Wen-Sheng Liu Wei Wei Ming Dong |
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Institution: | aState Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, PR China;bSouthwest Forestry College, Kunming 650224, PR China |
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Abstract: | Carex moorcroftii Falc. ex Boott is a rhizomatous clonal sedge dominating vast alpine steppe and meadow vegetations in the hinterland of the Qinghai-Tibet plateau. To reveal the genetic and clonal structure of this species, nine populations were investigated using ten inter-simple sequence repeat (ISSR) markers. As compared to other rhizomatous Carex species, C. moorcroftii had lower genetic diversity (Hs = 0.10) at population level and higher genetic differentiation (Gst = 0.66) and lower gene flow (Nm = 0.26) between populations. Clonal diversity in C. moorcroftii in terms of Simpson index (D = 0.65) was comparable to that in other clonal species while lower than that in Carex species from the arctic and subarctic areas. The ratio of clonal diversity to genetic variation in C. moorcroftii was closely correlated with latitude, enabling a speculation about the northern migration of this species on this plateau. |
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Keywords: | Carex moorcroftii The Qinghai-Tibet plateau ISSR Clonal diversity Genetic diversity Tanggula mountains |
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