Genetic diversity and population structure of wild sunflower (Helianthus annuus L.) in Argentina: reconstructing its invasion history

Studying the levels and patterns of genetic diversity of invasive populations is important to understand the evolutionary and ecological factors promoting invasions and for better designing preventive and control strategies. Wild sunflower (Helianthus annuus L.) is native to North America and was introduced, and has become invasive, in several countries, including Argentina (ARG). Here, using classical population genetic analyses and Approximate Bayesian Computation (ABC) modelling, we studied the invasion history of wild sunflower in ARG. We analyzed 115 individuals belonging to 15 populations from ARG (invasive range) and United States (US, native range) at 14 nuclear and three chloroplast simple sequence repeat markers along with 23 phenotypic variables. Populations from ARG showed similar levels of nuclear genetic diversity to US populations and higher genetic diversity in the chloroplast genome, indicating no severe genetic bottlenecks during the invasion process. Bayesian clusteri...

探究入侵种群的遗传多样性水平与分布模式，对于解析驱动生物入侵的演化与生态机制、优化入侵物种的预防与防控策略具有重要学术价值。野生向日葵（Helianthus annuus L.）原产于北美洲，后被引入包括阿根廷（ARG）在内的多个国家并已演变为入侵物种。本研究采用经典种群遗传学分析方法与近似贝叶斯计算（Approximate Bayesian Computation，ABC）模型，对阿根廷境内野生向日葵的入侵历史开展系统性探究。我们对采自阿根廷（入侵分布区）与美国（原生分布区）共15个种群的115份个体，基于14个核基因组简单序列重复（simple sequence repeat，SSR）标记、3个叶绿体基因组简单序列重复标记，结合23个表型性状变量展开遗传分析。结果显示，阿根廷入侵种群的核基因组遗传多样性水平与美国原生种群基本持平，而叶绿体基因组遗传多样性水平更高，表明该入侵过程未经历严重的遗传瓶颈效应。贝叶斯聚类……