Genetic diversity of Elymus nutans under different grazing intensities

doi:10.11686/cyxb2014355

Abstract

Abstract: Grazing can influence the population genetics and evolution of grassland plant species. To study the relationship between grazing and the potential for evolutionary differentiation and gene flow, we used SSR markers to study the genetic diversity of Elymus nutans. The experiment station investigated is based at Azi, in Maqu County in the Gannan region of Gansu Province. The grazing lands were divided into four levels according to different grazing intensities. Eight pairs of SSR primers were used to detect genetic diversity among 800 individual plants from the four populations under different grazing pressures. The effective number of alleles per locus ranged from 1.2267 to 1.9976. We found that materials under moderate grazing intensity had the highest genetic diversity index, followed by the heavy and then light grazing levels. The genetic differentiation coefficient under different grazing levels is 0.5168. This suggests that genetic variation of the four populations exists mainly among populations. In conclusion, no grazing or enclosure is effective for the conservation of E. nutans genetic resources. For grassland utilization, however, moderate grazing is relatively optimal.

CHEN Zhao, LIANG Xin-Ping, HOU Fu-Jiang, TIAN Miao-Miao, ZHANG Hong-Rui, YU Ying, GUAN Yong-Zhuo, WANG Cheng-Zhang, YAN Xue-Bing. Genetic diversity of Elymus nutans under different grazing intensities[J]. Acta Prataculturae Sinica, 2015, 24(8): 159-165.

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