Su Zhihao, Richardson Bryce A, Zhuo Li, Jiang Xiaolong, Li Wenjun, Kang Xiaoshan
Key Laboratory of Biogeography and Bioresource in Arid Land, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, no. 818 South Beijing Road, Xinjiang, Urumqi 830011, China.
USDA Forest Service, Rocky Mountain Research Station, 735 North 500 East, Provo, UT 84606, USA.
AoB Plants. 2017 Apr 18;9(3):plx016. doi: 10.1093/aobpla/plx016. eCollection 2017 May.
Population genetic information can provide valuable insight for the conservation and management of threatened and endangered plant species. is an endangered shrub endemic to arid basins of northwestern China. This species serves to stabilize soils in this region, but has seen substantial loss in its abundance due to depletion of ground water. The populations of this species have become small and fragmented, warranting conservation. Seven microsatellite loci were used to assess the genetic diversity and structure of 15 populations in the Tarim Basin, China. Among populations, the expected heterozygosity and total gene diversity were both moderate ( = 0.392, = 0.432), however the allelic diversity was low ( = 2.4). Eleven populations were detected to have experienced recent bottlenecks using Wilcoxon's test and a model-shift test. Most populations of in the centre of Tarim Basin showed low levels of genetic differentiation, but higher levels in geographically outlying populations. Genetic structure based on Bayesian assignment, the neighbour-joining network and principal coordinates analyses produced similar results, supporting five groups in the Tarim Basin. Gene flow was high among Bayesian groups based on historical gene flow estimated by private alleles. The genetic structure of supports a pattern where gene flow principally occurs along river corridors through hydrochory of seeds and insect-mediated pollination. Populations upstream have contributed to a more diverse mixture of populations near the confluence of several rivers near the centre of Tarim Basin. This pattern of genetic structure could be influenced by the flow of water from different river systems. Conservation efforts should focus on fostering the regeneration of this species, maintaining genetic diversity and preserving the extant genetic structure. Conservation efforts are contingent upon maintaining ground water and streamflows in this arid basin.
种群遗传信息可为受威胁和濒危植物物种的保护与管理提供有价值的见解。[该物种名称未给出]是中国西北干旱盆地特有的一种濒危灌木。该物种有助于稳定该地区的土壤，但由于地下水枯竭，其数量已大幅减少。该物种的种群已变得很小且分散，需要进行保护。利用七个微卫星位点评估了中国塔里木盆地15个种群的遗传多样性和结构。在种群之间，预期杂合度和总基因多样性均为中等（分别为0.392和0.432），但等位基因多样性较低（为2.4）。使用威尔科克森检验和模型转移检验检测到11个种群经历了近期瓶颈。塔里木盆地中部的大多数[该物种名称未给出]种群显示出较低水平的遗传分化，但地理上偏远的种群遗传分化水平较高。基于贝叶斯分配、邻接网络和主坐标分析的遗传结构产生了相似的结果，支持塔里木盆地存在五个群体。根据由私有等位基因估计的历史基因流，贝叶斯群体之间的基因流较高。[该物种名称未给出]的遗传结构支持一种模式，即基因流主要通过种子的水媒传播和昆虫介导的授粉沿着河流廊道发生。上游种群为塔里木盆地中部几条河流汇合处附近更多样化的种群混合做出了贡献。这种遗传结构模式可能受到不同河流系统水流的影响。保护工作应侧重于促进该物种的再生、维持遗传多样性和保护现存的遗传结构。保护工作取决于维持这个干旱盆地的地下水和水流。
