草业学报Issue(8)：159-165,7.DOI:10.11686/cyxb2014355
不同放牧强度下垂穗披碱草遗传多样性分析
Genetic diversity of Elymus nutans under different grazing intensities
摘要
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 ac-cording 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 al-leles 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 differentia-tion coefficient under different grazing levels is 0.5168.This suggests that genetic variation of the four popula-tions 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.关键词
遗传多样性/基因流/放牧强度/SSR/披碱草Key words
genetic diversity/gene flow/grazing intensity/SSR/Elymus引用本文复制引用
陈钊,梁新平,侯扶江,田苗苗,张红瑞,余莹,管永卓,王成章,严学兵..不同放牧强度下垂穗披碱草遗传多样性分析[J].草业学报,2015,(8):159-165,7.基金项目
国家自然科学基金项目（30901051，31172249）资助。 （）
