High genetic diversity in Taihangia rupestris Yu et Li,a rare cliff herb endemic to China,based on inter-simple sequence repeat markers |
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Authors: | Hong-Wei Wang Xiang-Min Fang Yong-Zhong Ye Yue-Qin Cheng Zhao-Shan Wang |
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Institution: | 1. College of Plant Protection, Henan Agricultural University, Zhengzhou 450002, PR China;2. College of Life Science, Henan Agricultural University, Zhengzhou 450002, PR China;3. Institute of Applied Ecology, Chinese Academy of Science, Shenyang 110016, PR China;4. State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Science, Beijing 100093, PR China |
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Abstract: | Taihangia rupestris Yu et Li is an endangered perennial herb endemic to China. Besides being at an important systematic position in the tribe Dryadeae, it also is a valuable wild flower resource. Inter-simple sequence repeat (ISSR) markers were employed to estimate the genetic diversity and genetic differentiation of ten populations. Relatively high genetic diversity was detected at species levels (PPB = 80.43; h = 0.2479; I = 0.3785). Most of the variation (73.51%) occurred within populations, and 26.49% was found among populations; Nei’s differentiation coefficient (Gst = 0.2435) supported this result. The Mantel test revealed a significantly positive correlation between geographical distance and genetic distance (r = 0.611, P < 0.001). The levels and patterns of genetic diversity of T. rupestris were assumed to result from its ancient origin and mixed reproductive modes. Based on these results, both ex situ and in situ conservation are proposed. |
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