The genomic basis of the plant island syndrome in Darwin's giant daisies.
Journal
Nature communications
ISSN: 2041-1723
Titre abrégé: Nat Commun
Pays: England
ID NLM: 101528555
Informations de publication
Date de publication:
28 06 2022
28 06 2022
Historique:
received:
06
12
2021
accepted:
09
06
2022
entrez:
28
6
2022
pubmed:
29
6
2022
medline:
1
7
2022
Statut:
epublish
Résumé
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.
Identifiants
pubmed: 35764640
doi: 10.1038/s41467-022-31280-w
pii: 10.1038/s41467-022-31280-w
pmc: PMC9240058
doi:
Substances chimiques
DNA Transposable Elements
0
Banques de données
Dryad
['10.5061/dryad.8gtht76rh']
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
3729Informations de copyright
© 2022. The Author(s).
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