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首页> 外文期刊>Global Ecology and Conservation >Original Research Article Genetic diversity and population structure of Distylium chinense revealed by ISSR and SRAP analysis in the Three Gorges Reservoir Region of the Yangtze River, China
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Original Research Article Genetic diversity and population structure of Distylium chinense revealed by ISSR and SRAP analysis in the Three Gorges Reservoir Region of the Yangtze River, China

机译：原始研究文章在中国长江三峡库区的ISSR和SRAP分析中展示了斯坦斯山脉的遗传多样性和人口结构

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Distylium chinense is a dominant native evergreen shrub or small tree in the riparian forests in the Three Gorges Reservoir zone in China. The genetic diversity and population structure of D. chinense within and among eight populations was analyzed by ISSR (Inter Simple Sequence Repeat) and SRAP (Sequence-Related Amplified Polymorphism) markers. A high level of genetic diversity was observed at the species level ( H = 0.3465, I ?=?0.5039 in ISSR; H ?=?0.1924, I ?=?0.4123 in SRAP) and at the population level ( H = 0.3047, I ?=?0.4471 in ISSR; H ?=?0.1543, I ?=?0.3415 in SRAP). The genetic differentiation among population ( G sub st /sub?=?0.1205, N sub m /sub?=?1.8247 in ISSR and G sub st /sub?=?0.1976, N sub m /sub?=?1.015 in SRAP) indicated low levels of genetic variation among populations and high levels of genetic polymorphism within populations. AMOVA (Analyses of molecular variance) also suggested that the main source of variation was within populations (93.9% in ISSR and SRAP in 81.9%). UPGMA (Unweighted Pair Group Method with Arithmetic means) cluster analysis and PCA (Principal Component Analysis) based on ISSR and SRAP amplification showed that populations from the same or adjacent regions were classified together. However, Mantel's test demonstrated that there was no significant correlation between the genetic distance and the geographical distance of each population ( P ??0.05). Thus, the declining status of this species is likely due to the destruction of natural habitats, anthropogenic activities and overharvesting, rather than a loss of genetic diversity.
机译：Standium Chinense是中国三峡库区河岸森林的主要原生灌木或小树。通过ISSR（简单序列重复）和SRAP（序列相关的扩增多态性）标记分析了D.中的遗传多样性和八种群体中的群体结构。在物种水平观察到高水平的遗传多样性（H = 0.3465，I？= 0.5039在ISSR; H？=？0.1924，I？=？0.4123，在SRAP中）和人口水平（H = 0.3047，我？=？0.4471在ISSR; H？=？0.1543，I？= 0.3415在SRAP中）。群体中的遗传分化（G st =Δ0.1205，n m m Δ=？1.8247在ISSR和G st ？= 0.1976， n m ？β1.015在srap中）表明群体中群体和高水平的遗传多态性在群体中的低含量变化。 Amova（分析分子方差分析）还建议主要的变异来源在群体内（ISSR和SRAP在81.9％的93.9％）内。基于ISSR和SRAP扩增的UPGMA（具有算术装置的未加权对组方法）集群分析和PCA（主成分分析）显示了来自相同或相邻区域的群体在一起。然而，Mantel的测试表明，遗传距离与每种人群的地理距离之间没有显着相关性（P？> 0.05）。因此，该物种的下降可能是由于自然栖息地的破坏，人类学活动和过度征收，而不是遗传多样性的丧失。

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