Environmental conditions and genetic differentiation: what drives the divergence of coexisting Leymus chinensis ecotypes in a large-scale longitudinal gradient?
文献类型：期刊论文
| 作者 | Yuan, Shan1; Guo, Chengyuan; Ma, Linna; Wang, Renzhong
|
| 刊名 | JOURNAL OF PLANT ECOLOGY
 |
| 出版日期 | 2016 |
| 卷号 | 9期号:5页码:616-628 |
| 关键词 | genetic differentiation large-scale gradient microsatellites phenotypic traits Leymus chinensis ecotypes |
| ISSN号 | 1752-9921 |
| DOI | 10.1093/jpe/rtv084 |
| 文献子类 | Article |
| 英文摘要 | The two coexisting Leymus chinensis ecotypes exhibit remarkable divergences in adaptive strategies under drought and salinity in semi-humid meadows and semi-arid steppes. In order to detect the major genetic and environmental factors dominating the intraspecific phenotype variations and ecotype formation, the questions regarding the two distinct phenotypic forms (ecotypes) in L. chinensis were addressed: (i) did environments drive the L. chinensis ecotype formation? (ii) was there a molecular basis for the morphological divergence between the two ecotypes? (iii) which driving force dominated the intraspecies divergence, divergent natural selection, genetic drift or stabilizing selection? We applied a series experiments on demographical, morphological and physiological traits of two Leymus chinensis ecotypes with gray green (GG) and yellow green (YG) leaf color in nine wild sites along a longitudinal gradient from 114A degrees to 124A degrees E in northeast China. The environmental data including mean annual precipitation, mean annual temperature, elevation and soil properties were collected. We compared the differences of morphological, physiological and genetic differentiations between the two ecotypes. The GG type exhibited stronger fitness than YG type from the population densities, morphological traits (e.g. shoot height, leaf area, leaf and seed weights et al.), leaf mass per area (LMA) and physiological traits [relative water content (RWC), proline, soluble sugar contents]. Most of above phenotypes (e.g. total shoot densities, spike length et al.) were significantly correlated with mean annual precipitation, mean annual temperature and soil water content (SWC), rarely a correlated with soil pH and soil nutrient. Transplanted populations showed convergence trend by their leaf chlorophyll contents and osmotic adjustments (proline and soluble sugar contents) in the greenhouse, but still exhibited their divergences between two ecotypes in the outdoor transplantation, suggesting that whether L. chinensis ecotype differentiated could be largely affected by the environmental conditions. Furthermore, by the comparison result of quantitative genetic variation (Q (ST)) values from phenotypes with theoretical neutral genetic differentiation (F (ST)), differentiation in phenotypic traits greatly surpassed neutral predictions, implying that directional natural selection played a crucial role in L. chinensis ecotype differentiation. In addition, microsatellite analysis from Neighbor-joining tree and Bayesian assignment generated into two groups according to ecotypes, indicating molecular genetic differentiation also propelled the two ecotypes divergence. We conclude that L. chinensis population variations were driven by combing divergent natural selection (precipitation, temperature and SWCs) along the large-scale gradient and significantly intrinsic genetic differentiation. |
| 学科主题 | Plant Sciences ; Ecology ; Forestry |
| 出版地 | OXFORD |
| 电子版国际标准刊号 | 1752-993X |
| WOS关键词 | F-ST ; PHENOTYPIC PLASTICITY ; POPULATION-STRUCTURE ; ARABIDOPSIS-THALIANA ; NORTHEAST CHINA ; PLANT ; SPECIATION ; TRITICEAE ; DISTANCE ; Q(ST) |
| WOS研究方向 | Science Citation Index Expanded (SCI-EXPANDED) |
| 语种 | 英语 |
| WOS记录号 | WOS:000386153600013 |
| 出版者 | OXFORD UNIV PRESS |
| 资助机构 | National Scientific Foundation of ChinaNational Natural Science Foundation of China (NSFC) [31470404, 31070228] |
| 源URL | [http://ir.ibcas.ac.cn/handle/2S10CLM1/24963]  |
| 专题 | 植被与环境变化国家重点实验室 |
| 作者单位 | 1.Chinese Acad Sci, Inst Bot, State Lab Vegetat & Environm Change, Beijing 100093, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100093, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yuan, Shan,Guo, Chengyuan,Ma, Linna,et al. Environmental conditions and genetic differentiation: what drives the divergence of coexisting Leymus chinensis ecotypes in a large-scale longitudinal gradient?[J]. JOURNAL OF PLANT ECOLOGY,2016,9(5):616-628. |
| APA | Yuan, Shan,Guo, Chengyuan,Ma, Linna,&Wang, Renzhong.(2016).Environmental conditions and genetic differentiation: what drives the divergence of coexisting Leymus chinensis ecotypes in a large-scale longitudinal gradient?.JOURNAL OF PLANT ECOLOGY,9(5),616-628. |
| MLA | Yuan, Shan,et al."Environmental conditions and genetic differentiation: what drives the divergence of coexisting Leymus chinensis ecotypes in a large-scale longitudinal gradient?".JOURNAL OF PLANT ECOLOGY 9.5(2016):616-628. |
入库方式： OAI收割
来源：植物研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。