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首页> 美国卫生研究院文献>Frontiers in Plant Science >Species delimitation genetic diversity and population historical dynamics of Cycas diannanensis (Cycadaceae) occurring sympatrically in the Red River region of China
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Species delimitation genetic diversity and population historical dynamics of Cycas diannanensis (Cycadaceae) occurring sympatrically in the Red River region of China

机译：红河地区同时发生的滇滇苏铁的物种界定遗传多样性和种群历史动态

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Delimitating species boundaries could be of critical importance when evaluating the species' evolving process and providing guidelines for conservation genetics. Here, species delimitation was carried out on three endemic and endangered Cycas species with resembling morphology and overlapped distribution range along the Red River (Yuanjiang) in China: Cycas diananensis Z. T. Guan et G. D. Tao, Cycas parvula S. L. Yang and Cycas multiovula D. Y. Wang. A total of 137 individuals from 15 populations were genotyped by using three chloroplastic (psbA-trnH, atpI-atpH, and trnL-rps4) and two single copy nuclear (RPB1 and SmHP) DNA sequences. Basing on the carefully morphological comparison and cladistic haplotype aggregation (CHA) analysis, we propose all the populations as one species, with the rest two incorporated into C. diannanensis. Genetic diversity and structure analysis of the conflated C. diannanensis revealed this species possessed a relative lower genetic diversity than estimates of other Cycas species. The higher genetic diversity among populations and relative lower genetic diversity within populations, as well as obvious genetic differentiation among populations inferred from chloroplastic DNA (cpDNA) suggested a recent genetic loss within this protected species. Additionally, a clear genetic structure of C. diannanensis corresponding with geography was detected based on cpDNA, dividing its population ranges into “Yuanjiang-Nanhun” basin and “Ejia-Jiepai” basin groups. Demographical history analyses based on combined cpDNA and one nuclear DNA (nDNA) SmHP both showed the population size of C. diannanensis began to decrease in Quaternary glaciation with no subsequent expansion, while another nDNA RPB1 revealed a more recent sudden expansion after long-term population size contraction, suggesting its probable bottleneck events in history. Our findings offer grounded views for clarifying species boundaries of C. diannanensis when determining the conservation objectives. For operational guidelines, the downstream populations which occupy high and peculiar haplotypes should be given prior in-situ conservation. In addition, ex-situ conservation and reintroduction measures for decades of generations are supplemented for improving the population size and genetic diversity of the endemic and endangered species.
机译：在评估物种的进化过程并为保护遗传学提供指导时，界定物种边界可能至关重要。在这里，对中国沿红河（元江）形态相似且分布范围重叠的三种特有和濒临绝种的苏铁属物种进行了划界：滇苏铁（Cycas diananensis Z.T.Guan D.通过使用三个叶绿体基因（psbA-trnH，atpI-atpH和trnL-rps4）和两个单拷贝核（RPB1和SmHP）DNA序列对来自15个种群的137个人进行基因分型。基于仔细的形态比较和克拉德单体型聚合（CHA）分析，我们提出所有种群为一个物种，其余两个种群被纳入滇南毛.。对合并的滇南梭菌的遗传多样性和结构分析表明，该物种的遗传多样性低于其他苏铁属物种的估计值。种群间较高的遗传多样性和种群内相对较低的遗传多样性，以及根据叶绿体DNA（cpDNA）推断出的种群间明显的遗传分化，表明该受保护物种近期发生了遗传丧失。此外，基于cpDNA，检测到了滇南毛竹的明确遗传结构，将其种群划分为“元江—南浑”盆地和“峨家—界牌”盆地群。基于组合cpDNA和一个核DNA（nDNA） SmHP 的人口历史分析均显示了 C的人口规模。 diannanensis 在第四纪冰川期开始减少，没有随后的扩展，而另一种nDNA RPB1 在长期种群规模收缩后显示出最近的突然扩展，表明其历史上可能是瓶颈事件。我们的发现为阐明 C的物种边界提供了基础的观点。确定保护目标时应选择的植物。对于操作指南，应在原位保存之前对占据高单倍型的下游种群进行评估。此外，几十年来世代相传的迁地保护和再引进措施得到了补充，以改善特有和濒危物种的种群规模和遗传多样性。

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