The role of hybridization for the invasion success of meadow knapweed Centaurea x moncktonii in North America

杂交对北美草甸矢车菊入侵成功的作用

• 批准号: 364469010
• 负责人: Dr. Susanne Lachmuth
• 金额: --
• 依托单位: Department of Plant Biology
• 依托单位国家: 德国
• 项目类别: Research Fellowships
• 财政年份: 2017
• 资助国家: 德国
• 起止时间: 2016-12-31 至 无数据
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/364469010?language=en
• 关键词: role; hybridization; invasion; success; meadow

Biological invasions are a major threat for biodiversity and ecosystem functioning and at the same time excellent study systems for fundamental ecological and evolutionary research questions. Choosing the optimal management strategies requires a mechanistic understanding of the ecological and evolutionary processes underlying invasion dynamics and success. The proposed project addresses inter-specific hybridization, genomic admixture and genome size variation as mechanisms that facilitate the evolution of traits that are indicative of invasiveness. The study system, the Centaurea x moncktonii (meadow knapweed) hybrid complex, comprises a set of parental species and their hybrids that are native in Eurasia and invasive in North America. Meadow knapweed is spreading rapidly in a majority of the United States and has severe negative ecological and economic impact. We will combine studies of genomic and quantitative trait variation to:1. Describe the genomic composition and degree of hybridization in highly invasive Northeastern North American populations;2. Link variation in genome size and quantitative traits to the genomic variation and taxonomic identity of individuals;3. Elucidate if individuals with a high degree of genomic admixture exhibit traits that are commonly associated with invasiveness; 4. Clarify if individuals with small genome size exhibit traits that are commonly associated with invasiveness.In summary, this project will yield a first description of the genomic composition and taxonomic identity of meadow knapweed populations in the Northeastern United States. It will clarify the relationships between genome size variation, taxonomic identity, genomic admixture and phenotypic traits indicative of invasiveness. The results will provide a foundation for further exploration of the genomic consequences of hybridization as well as the genomic basis of adaptive evolution of invasiveness in C. x moncktonii hybrid swarms. This information will help developing management strategies for Centaurea x moncktonii in North America.

生物入侵是生物多样性和生态系统功能的主要威胁，同时也是基础生态和进化研究问题的良好研究系统。选择最优的管理策略需要对入侵动态和成功背后的生态和进化过程有一个机制的理解。提出的项目解决种间杂交，基因组混合和基因组大小变化的机制，促进特征的进化，表明入侵。该研究系统是Centaurea x moncktonii（草甸knapweed）杂交复合体，由一组原产于欧亚大陆、入侵北美的亲本物种及其杂交物种组成。草甸knapweed在美国大部分地区迅速蔓延，对生态和经济造成了严重的负面影响。我们将结合基因组和数量性状变异的研究：1。描述高入侵性北美东北部人群的基因组组成和杂交程度；2 .将基因组大小和数量性状的变异与个体的基因组变异和分类认同联系起来；阐明具有高度基因组混合的个体是否表现出通常与侵袭性相关的特征；4. 澄清小基因组大小的个体是否表现出通常与侵袭性相关的特征。总之，该项目将产生美国东北部草甸knapweed种群的基因组组成和分类特征的第一个描述。它将阐明基因组大小变异、分类同一性、基因组混杂和指示入侵的表型性状之间的关系。该结果将为进一步探索杂交的基因组结果以及C. x moncktonii杂交群体入侵性适应性进化的基因组基础提供基础。这些信息将有助于制定北美半人马座x moncktonii的管理战略。