Introgression shapes fruit color convergence in invasive Galápagos tomato

eLife

Matthew JS Gibson¹  Leonie C Moyle¹  Yaniv Brandvain²  María de Lourdes Torres³ 

[1] Department of Biology, Indiana University, Bloomington, United States;Department of Plant Biology, University of Minnesota-Twin Cities, St. Paul, United States;Universidad San Francisco de Quito (USFQ). Colegio de Ciencias Biológicas y Ambientales, Laboratorio de Biotecnología Vegetal. Campus Cumbayá, Quito, Ecuador;Galapagos Science Center, Universidad San Francisco de Quito and University of North Carolina at Chapel Hill, Galapagos, Ecuador;

关键词: Galápagos;    in situ hybridization;    introgression;    tomato;    convergence;    invasion;    Other;   

DOI  :  10.7554/eLife.64165

来源: eLife Sciences Publications, Ltd

【 摘 要 】

Invasive species represent one of the foremost risks to global biodiversity. Here, we use population genomics to evaluate the history and consequences of an invasion of wild tomato—Solanum pimpinellifolium—onto the Galápagos Islands from continental South America. Using >300 archipelago and mainland collections, we infer this invasion was recent and largely the result of a single event from central Ecuador. Patterns of ancestry within the genomes of invasive plants also reveal post-colonization hybridization and introgression between S. pimpinellifolium and the closely related Galápagos endemic Solanum cheesmaniae. Of admixed invasive individuals, those that carry endemic alleles at one of two different carotenoid biosynthesis loci also have orange fruits—characteristic of the endemic species—instead of typical red S. pimpinellifolium fruits. We infer that introgression of two independent fruit color loci explains this observed trait convergence, suggesting that selection has favored repeated transitions of red to orange fruits on the Galápagos.

【 授权许可】

CC BY