文献类型：期刊文献

英文题名：Exploring Species Limits in Two Closely Related Chinese Oaks

作者：Zeng, Yan-Fei[1,2] Liao, Wan-Jin[2] Petit, Remy J.[3,4] Zhang, Da-Yong[2]

第一作者：Zeng, Yan-Fei;曾艳飞

通信作者：Zeng, YF[1]

机构：[1]Chinese Acad Forestry, Res Inst Forestry, Key Lab Silviculture, State Forestry Adm, Beijing, Peoples R China;[2]Beijing Normal Univ, Minist Educ, Key Lab Biodivers Sci & Ecol Engn, Coll Life Sci, Beijing 100875, Peoples R China;[3]INRA, UMR Biodivers Genes & Ecosyst, Cestas, France;[4]Univ Bordeaux, UMR Biodivers Genes & Ecosyst, Cestas, France

年份：2010

卷号：5

期号：11

外文期刊名：PLOS ONE

收录：;Scopus(收录号：2-s2.0-78649795003);WOS:【SCI-EXPANDED(收录号:WOS:000284755100092)】；

基金：This work was financially supported by the National Natural Science Foundation of China (30430160) and Beijing Normal University. RJP's research is supported by the European Union-sponsored Network of Excellence EVOLTREE. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

语种：英文

摘要：Background: The species status of two closely related Chinese oaks, Quercus liaotungensis and Q. mongolica, has been called into question. The objective of this study was to investigate the species status and to estimate the degree of introgression between the two taxa using different approaches. Methodology/Principal Findings: Using SSR (simple sequence repeat) and AFLP (amplified fragment length polymorphism) markers, we found that interspecific genetic differentiation is significant and higher than the differentiation among populations within taxa. Bayesian clusters, principal coordinate analysis and population genetic distance trees all classified the oaks into two main groups consistent with the morphological differentiation of the two taxa rather than with geographic locations using both types of markers. Nevertheless, a few individuals in Northeast China and many individuals in North China have hybrid ancestry according to Bayesian assignment. One SSR locus and five AFLPs are significant outliers against neutral expectations in the interspecific F(ST) simulation analysis, suggesting a role for divergent selection in differentiating species. Main Conclusions/Significance: All results based on SSRs and AFLPs reached the same conclusion: Q. liaotungensis and Q. mongolica maintain distinct gene pools in most areas of sympatry. They should therefore be considered as discrete taxonomic units. Yet, the degree of introgression varies between the two species in different contact zones, which might be caused by different population history or by local environmental factors.