Unraveling Evolution in the Homoploid Complex of Baccharis L. in Chile

IF 2.3 2区生物学 Q2 ECOLOGY

Ecology and Evolution Pub Date : 2025-10-07 DOI:10.1002/ece3.72249

Fabian Schneider, Olga Zafra-Delgado, Tobias G. Köllner, Frank Hellwig

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引用次数: 0

Abstract

Baccharis × intermedia (Asteraceae), found in central Chile, is a naturally occurring hybrid derived from the parent species B. macraei and B. linearis. It represents an extraordinary example of admixture with additive plant chemistry; however, the genetic structure of the hybrid complex and its evolution are still unclear. Intensive field sampling and Genotyping-by-Sequencing (GBS) were used to clarify the structure of the B. × intermedia hybrid complex. In addition, B. vernalis, another species that resembles the morphology of B. macraei, was subjected to analysis to ascertain its role in the hybridization process. A total of 3724 SNPs and 378 individuals were analyzed using clustering, PCA, Treemix, Patterson's D- and f-statistics. Furthermore, other genetic indicators, such as levels of heterozygosity, Tajima's D, and nucleotide diversity (π) also provided further insight into the hybrid complex. Our results show that B. × intermedia consists mainly of F₁-hybrids with 18% backcrossing to both parental species. B. vernalis was not involved in recent hybridization with B. macraei and B. linearis. Additionally, a recent introgression into the Quintay population of B. macraei from B. linearis was detected during the analysis. There is no indication of hybrid speciation. Altogether, our extensive field sampling combined with genetic analyses has provided deeper insights into the genetic structure and evolution of the B. × intermedia hybrid complex in Chile.

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智利Baccharis L.同倍体复合体的进化揭示。

产于智利中部的中介花（Asteraceae）是由亲本种B. macraei和B. linearis自然产生的杂交种。它代表了添加剂植物化学的一个非凡的例子；然而，杂交复合体的遗传结构及其演化尚不清楚。利用密集的田间取样和基因分型测序（GBS）技术，明确了B. x中间杂交复合体的结构。此外，研究人员还分析了另一种与大黄芽孢杆菌形态相似的春芽孢杆菌，以确定其在杂交过程中的作用。采用聚类、PCA、Treemix、Patterson’s D-和f统计等方法对3724个snp和378个个体进行分析。此外，其他遗传指标，如杂合度水平，田岛D和核苷酸多样性（π）也提供了进一步了解杂交复合体。结果表明，B. x中间种主要由f1杂交种组成，与两个亲本种回交比例为18%。春芽孢杆菌未参与近期与大芽孢杆菌和线性芽孢杆菌的杂交。此外，在分析过程中还发现了线性小蠊对五泰种群的遗传渗入。没有杂交物种形成的迹象。总的来说，我们广泛的现场采样与遗传分析相结合，为智利B. x中间杂交复合体的遗传结构和进化提供了更深入的见解。

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来源期刊

Ecology and Evolution ECOLOGY-

CiteScore

4.40

自引率

3.80%

发文量

1027

审稿时长

3-6 weeks

期刊介绍： Ecology and Evolution is the peer reviewed journal for rapid dissemination of research in all areas of ecology, evolution and conservation science. The journal gives priority to quality research reports, theoretical or empirical, that develop our understanding of organisms and their diversity, interactions between them, and the natural environment. Ecology and Evolution gives prompt and equal consideration to papers reporting theoretical, experimental, applied and descriptive work in terrestrial and aquatic environments. The journal will consider submissions across taxa in areas including but not limited to micro and macro ecological and evolutionary processes, characteristics of and interactions between individuals, populations, communities and the environment, physiological responses to environmental change, population genetics and phylogenetics, relatedness and kin selection, life histories, systematics and taxonomy, conservation genetics, extinction, speciation, adaption, behaviour, biodiversity, species abundance, macroecology, population and ecosystem dynamics, and conservation policy.