High Genetic Diversity With Weak Phylogeographic Structure of the Invasive Spartina alterniflora (Poaceae) in China
High Genetic Diversity With Weak Phylogeographic Structure of the Invasive Spartina alterniflora (Poaceae) in China
复制标题
中国入侵互花米草（禾本科）遗传多样性高但系统发育地理结构弱
DOI：
10.3389/fpls.2019.01467
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发表时间：
2019-11
影响因子：
5.6
通讯作者：
Li Bo
中科院分区：
文献类型：
--
作者：
Shang Lei;Li Lin-Feng;Song Zhi-Ping;Wang Yi;Yang Ji;Wang Chuan-Chao;Qiu Shi-Yun;Huang Jing-Xin;Nie Ming;Wolfe Lorne M.;Li Bo
生物入侵是一个全球性的问题，由于其对当地生态系统和社会的巨大负面影响。阐明支持入侵的进化历史和遗传基础对于理解外来物种如何入侵和适应新环境至关重要。互花米草（Spartina alterniflora，2n = 6x = 62）是一种严重危害生态系统的外来入侵植物。在此，我们讨论了该物种的入侵和扩散的历史，在过去的几十年中沿沿着的进化机制。本研究利用9个微卫星标记和3个叶绿体片段对11个美国本土种和11个中国入侵种的地理结构和遗传多样性进行了研究。互花米草种群还分别对本地和侵入性人群进行了人口统计学史模拟。对这些自然种群的遗传学比较分析表明，虽然所有中国种群都是一次性引进的，但遗传多样性水平较高，地理结构较弱。特别是，遗传特征和数学模拟都说明了中国人群中最近的人口扩张。我们发现，在美国本土人群中发现的遗传变异在中国人群中是混合的，这表明这些原始变异在入侵过程中发生了重组。这些遗传特征表明，中国种群在入侵过程中可能没有经历过遗传瓶颈。高的遗传多样性和遗传混合性可能是该菌成功入侵的重要原因。alterniflora在中国。我们的研究提供了一个框架，如何顺利灯心草蔓延沿着中国沿海地区，以及其潜在的遗传机制的入侵。
Biological invasion represents a global issue of concern due to its large negative impacts on native ecosystems and society. Elucidating the evolutionary history and genetic basis underpinning invasiveness is critical to understanding how alien species invade and adapt to novel environments. Smooth cordgrass (Spartina alterniflora, 2n = 6x = 62) is a notorious invasive species that causes heavily negative effects on native ecosystems worldwide. Here we addressed the evolutionary mechanisms underlying the invasion and dispersal history of this species along the China coast in the past decades. We employed nine microsatellites and three chloroplast fragments to investigate phylogeographic structure and genetic diversity of 11 native US and 11 invasive Chinese S. alterniflora populations. Demographic history simulation was also performed for both the native and invasive populations, respectively. Comparative genetic analyses of these natural populations revealed that although all the Chinese populations were introduced only once, high level of genetic diversity with weak geographic structure was observed. In particular, both the genetic features and mathematical simulation illustrated very recent population expansion in the Chinese populations. We found that genetic variants identified in native US populations were mixed in the Chinese populations, suggesting the recombination of these original variants during the invasion process. These genetic attributes indicate that Chinese populations might not have experienced a genetic bottleneck during the invasion process. High genetic diversity and genetic admixture might have contributed to the success of invasion of S. alterniflora in China. Our study provides a framework of how the smooth cordgrass spreads along the China coast as well as its potential genetic mechanisms underlying the invasion.
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影响因子：
3.3
作者：
J. K. Pritchard;Matthew Stephens;Peter Donnelly
通讯作者：
J. K. Pritchard;Matthew Stephens;Peter Donnelly
影响因子：
3.9
作者：
Blum, Michael J.;Bando, K. Jun;Strong, Donald R.
通讯作者：
Strong, Donald R.
影响因子：
4.4
作者：
Bedre R;Mangu VR;Srivastava S;Sanchez LE;Baisakh N
通讯作者：
Baisakh N
影响因子：
2.2
作者：
Christina M. Sloop;Heather Mcgray;M. Blum;D. Strong
通讯作者：
Christina M. Sloop;Heather Mcgray;M. Blum;D. Strong
DOI：
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发表时间：
2006
期刊：
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影响因子：
--
作者：
通讯作者：
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