The genomic basis of adaptive leaf variation in the Galápagos giant daisies

Scalesia (Asteraceae) is the largest endemic plant genus of the Galápagos archipelago and an example of adaptive radiation. While Scalesia species are highly varied in habit and morphology, most remarkable is their variety of leaf shapes, especially in the differential presence of leaf lobing/serration, a derived trait that evolved multiple times as a likely adaptation to the islands' hot and dry equatorial climate. Using population-level genomic data from 396 individuals representing all 15 recognized Scalesia species, we characterize this young radiation (around 1 million years ago), and reveal that their substantial morphological divergence and ecological specialization are primarily based on shared genetic variation. To further elucidate the repeated adaptive evolution of leaf lobing in Scalesia, we integrate genomic and leaf morphometric data, with transcriptomes from different developmental stages, and conclude that leaf lobing evolved through diversifying selection. Natural selection occurs independently on different regulators in the pathway controlling development of adaxial-abaxial leaf polarity, highlighting the importance of the founder populations' high genetic diversity maintained via allopolyploidy. Finally, our findings have implications for the conservation of Scalesia's threatened biodiversity, as unexpectedly high intra-specific genetic structure and long-term isolation among populations indicate widespread nascent speciation.

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Publication Details

Journal
Nature Communications
Published
2026-04-16
DOI
https://doi.org/10.1038/s41467-026-71865-3
Primary Topic
Plant Diversity and Evolution
Type
article
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article

The genomic basis of adaptive leaf variation in the Galápagos giant daisies

Gitte Petersen, Ole Seberg, Jazmín Ramos‐Madrigal, Mohsen Falahati‐Anbaran et al.
Nature Communications
Plant Diversity and Evolution
article

The genomic basis of adaptive leaf variation in the Galápagos giant daisies

Gitte Petersen, Ole Seberg, Jazmín Ramos‐Madrigal, Mohsen Falahati‐Anbaran, Paul Battlay, Lene Rostgaard Nielsen, Vanessa C. Bieker, Michael D. Martin, Mario Fernández‐Mazuecos, Rasmus Nielsen, Neelima Sinha, James Leebens-Mack, Luisa Santos‐Bay, Sarah L F Martin, Gonzalo Rivas-torres, Patricia Jaramillo Díaz, Loren H. Rieseberg, Siyu Li, Pablo Vargas, Amit Sharma, José Cerca, M. Thomas P. Gilbert
article en

Abstract

Scalesia (Asteraceae) is the largest endemic plant genus of the Galápagos archipelago and an example of adaptive radiation. While Scalesia species are highly varied in habit and morphology, most remarkable is their variety of leaf shapes, especially in the differential presence of leaf lobing/serration, a derived trait that evolved multiple times as a likely adaptation to the islands' hot and dry equatorial climate. Using population-level genomic data from 396 individuals representing all 15 recognized Scalesia species, we characterize this young radiation (around 1 million years ago), and reveal that their substantial morphological divergence and ecological specialization are primarily based on shared genetic variation. To further elucidate the repeated adaptive evolution of leaf lobing in Scalesia, we integrate genomic and leaf morphometric data, with transcriptomes from different developmental stages, and conclude that leaf lobing evolved through diversifying selection. Natural selection occurs independently on different regulators in the pathway controlling development of adaxial-abaxial leaf polarity, highlighting the importance of the founder populations' high genetic diversity maintained via allopolyploidy. Finally, our findings have implications for the conservation of Scalesia's threatened biodiversity, as unexpectedly high intra-specific genetic structure and long-term isolation among populations indicate widespread nascent speciation.

Nature Communications
University of North Carolina at Chapel Hill (US), University of Copenhagen (DK), Charles Darwin Foundation (EC), University of North Carolina Health Care (US), University of British Columbia (CA), Stockholm University (SE), University of Georgia (US), University of Oslo (NO), Norwegian University of Science and Technology (NO), Royal Botanic Gardens, Kew (GB), Science for Life Laboratory (SE), Swedish Museum of Natural History (SE), Evolutionary Genomics (United States) (US), Natural History Museum Aarhus (DK), Real Jardín Botánico (ES), Monash University (AU), Universidad Autónoma de Madrid (ES), Universidad de Málaga (ES), University of California, Davis (US), Galapagos (Belgium) (BE)
Openalex Percentile: Top 11%
Plant Diversity and Evolution
DOIOpen Access PDFOpenAlex
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