TY - JOUR
T1 - The genomic basis of the plant island syndrome in Darwin’s giant daisies
AU - Cerca, José
AU - Petersen, Bent
AU - Lazaro-Guevara, José Miguel
AU - Rivera-Colón, Angel
AU - Birkeland, Siri
AU - Vizueta, Joel
AU - Li, Siyu
AU - Li, Qionghou
AU - Loureiro, João
AU - Kosawang, Chatchai
AU - Díaz, Patricia Jaramillo
AU - Rivas-Torres, Gonzalo
AU - Fernández-Mazuecos, Mario
AU - Vargas, Pablo
AU - McCauley, Ross A.
AU - Petersen, Gitte
AU - Santos-Bay, Luisa
AU - Wales, Nathan
AU - Catchen, Julian M.
AU - Machado, Daniel
AU - Nowak, Michael D.
AU - Suh, Alexander
AU - Sinha, Neelima R.
AU - Nielsen, Lene R.
AU - Seberg, Ole
AU - Gilbert, M. Thomas P.
AU - Leebens-Mack, James H.
AU - Rieseberg, Loren H.
AU - Martin, Michael D.
N1 - Publisher Copyright:
© 2022, The Author(s).
PY - 2022/12
Y1 - 2022/12
N2 - The repeated, rapid and often pronounced patterns of evolutionary divergence observed in insular plants, or the ‘plant island syndrome’, include changes in leaf phenotypes, growth, as well as the acquisition of a perennial lifestyle. Here, we sequence and describe the genome of the critically endangered, Galápagos-endemic species Scalesia atractyloides Arnot., obtaining a chromosome-resolved, 3.2-Gbp assembly containing 43,093 candidate gene models. Using a combination of fossil transposable elements, k-mer spectra analyses and orthologue assignment, we identify the two ancestral genomes, and date their divergence and the polyploidization event, concluding that the ancestor of all extant Scalesia species was an allotetraploid. There are a comparable number of genes and transposable elements across the two subgenomes, and while their synteny has been mostly conserved, we find multiple inversions that may have facilitated adaptation. We identify clear signatures of selection across genes associated with vascular development, growth, adaptation to salinity and flowering time, thus finding compelling evidence for a genomic basis of the island syndrome in one of Darwin’s giant daisies.
AB - The repeated, rapid and often pronounced patterns of evolutionary divergence observed in insular plants, or the ‘plant island syndrome’, include changes in leaf phenotypes, growth, as well as the acquisition of a perennial lifestyle. Here, we sequence and describe the genome of the critically endangered, Galápagos-endemic species Scalesia atractyloides Arnot., obtaining a chromosome-resolved, 3.2-Gbp assembly containing 43,093 candidate gene models. Using a combination of fossil transposable elements, k-mer spectra analyses and orthologue assignment, we identify the two ancestral genomes, and date their divergence and the polyploidization event, concluding that the ancestor of all extant Scalesia species was an allotetraploid. There are a comparable number of genes and transposable elements across the two subgenomes, and while their synteny has been mostly conserved, we find multiple inversions that may have facilitated adaptation. We identify clear signatures of selection across genes associated with vascular development, growth, adaptation to salinity and flowering time, thus finding compelling evidence for a genomic basis of the island syndrome in one of Darwin’s giant daisies.
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U2 - 10.1038/s41467-022-31280-w
DO - 10.1038/s41467-022-31280-w
M3 - Article
C2 - 35764640
AN - SCOPUS:85132977043
SN - 2041-1723
VL - 13
JO - Nature communications
JF - Nature communications
IS - 1
M1 - 3729
ER -