Evolution of “invasion syndrome” in invasive goldenrod is not constrained by genetic trade-offs

IF 3.5 2区 生物学 Q1 EVOLUTIONARY BIOLOGY
Laura C. Rigby, Matthew D. Hall, Keyne Monro, Akane Uesugi
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Abstract

A suite of plant traits is thought to make weed populations highly invasive, including vigorous growth and reproduction, superior competitive ability, and high dispersal ability. Using a breeding design and a common garden experiment, we tested whether such an “invasion syndrome” has evolved in an invasive range of Solidago altissima, and whether the evolution is likely to be genetically constrained. We found an overall shift in invasive phenotypes between native North American and invasive Japanese populations. The invasive populations were taller and produced more leaves, suggesting a superior ability to exploit limited resources. The populations also produced more allelopathic compounds that can suppress competitor growth. Finally, invasive populations produced more seeds, which are smaller and are released from a greater height, indicating a potential for superior dispersal ability than the native populations. Quantitative genetics analyses found a large amount of additive genetic variation in most focal traits across native and invasive populations, with no systematic differences in its magnitude between the ranges. Genetic covariances among three traits representing invasion strategies (leaf mass, polyacetylene concentration and seed size) were small. The R metric, which measures the effect of genetic covariances on the rate of adaptation, indicated that the covariance neither constrains nor accelerates concerted evolution of these traits. The results suggest that the invasion syndrome in S. altissima has evolved in the novel range due to ample additive genetic variation, and relatively free from genetic trade-offs.

Abstract Image

入侵性金线莲 "入侵综合症 "的进化不受基因权衡的限制。
人们认为,杂草种群的一系列植物性状具有很强的入侵性,包括旺盛的生长和繁殖能力、卓越的竞争能力和很强的扩散能力。利用育种设计和普通花园实验,我们测试了这种 "入侵综合征 "是否已在莎草(Solidago altissima)的入侵范围内演化,以及这种演化是否可能受到遗传限制。我们发现北美原生种群和日本入侵种群的入侵表型发生了整体变化。入侵种群植株更高、叶片更多,表明其利用有限资源的能力更强。入侵种群还产生了更多可抑制竞争者生长的等效化合物。最后,入侵种群产生了更多的种子,这些种子更小,从更高的地方释放出来,表明其传播能力可能比本地种群更强。定量遗传学分析发现,原生种群和入侵种群的大多数焦点性状都存在大量的加性遗传变异,不同种群之间的遗传变异幅度没有系统性差异。代表入侵策略的三个性状(叶片质量、聚乙炔浓度和种子大小)之间的遗传协方差很小。衡量遗传协方差对适应速度影响的 R 指标表明,协方差既没有限制也没有加速这些性状的协同进化。研究结果表明,S. altissima 的入侵综合征是在新的范围内由于大量的遗传加性变异而进化的,相对来说没有遗传权衡。
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来源期刊
Evolutionary Applications
Evolutionary Applications 生物-进化生物学
CiteScore
8.50
自引率
7.30%
发文量
175
审稿时长
6 months
期刊介绍: Evolutionary Applications is a fully peer reviewed open access journal. It publishes papers that utilize concepts from evolutionary biology to address biological questions of health, social and economic relevance. Papers are expected to employ evolutionary concepts or methods to make contributions to areas such as (but not limited to): medicine, agriculture, forestry, exploitation and management (fisheries and wildlife), aquaculture, conservation biology, environmental sciences (including climate change and invasion biology), microbiology, and toxicology. All taxonomic groups are covered from microbes, fungi, plants and animals. In order to better serve the community, we also now strongly encourage submissions of papers making use of modern molecular and genetic methods (population and functional genomics, transcriptomics, proteomics, epigenetics, quantitative genetics, association and linkage mapping) to address important questions in any of these disciplines and in an applied evolutionary framework. Theoretical, empirical, synthesis or perspective papers are welcome.
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