The ecology of palm genomes: repeat-associated genome size expansion is constrained by aridity.
Arecaceae (palms)
adaptation
ecology
genome size
phylogenetic regression
plant evolution
trait evolution
transposable elements
Journal
The New phytologist
ISSN: 1469-8137
Titre abrégé: New Phytol
Pays: England
ID NLM: 9882884
Informations de publication
Date de publication:
10 2022
10 2022
Historique:
received:
04
11
2021
accepted:
18
05
2022
pubmed:
20
6
2022
medline:
28
9
2022
entrez:
19
6
2022
Statut:
ppublish
Résumé
Genome size varies 2400-fold across plants, influencing their evolution through changes in cell size and cell division rates which impact plants' environmental stress tolerance. Repetitive element expansion explains much genome size diversity, and the processes structuring repeat 'communities' are analogous to those structuring ecological communities. However, which environmental stressors influence repeat community dynamics has not yet been examined from an ecological perspective. We measured genome size and leveraged climatic data for 91% of genera within the ecologically diverse palm family (Arecaceae). We then generated genomic repeat profiles for 141 palm species, and analysed repeats using phylogenetically informed linear models to explore relationships between repeat dynamics and environmental factors. We show that palm genome size and repeat 'community' composition are best explained by aridity. Specifically, Ty3-gypsy and TIR elements were more abundant in palm species from wetter environments, which generally had larger genomes, suggesting amplification. By contrast, Ty1-copia and LINE elements were more abundant in drier environments. Our results suggest that water stress inhibits repeat expansion through selection on upper genome size limits. However, elements that may associate with stress-response genes (e.g. Ty1-copia) have amplified in arid-adapted palm species. Overall, we provide novel evidence of climate influencing the assembly of repeat 'communities'.
Identifiants
pubmed: 35717562
doi: 10.1111/nph.18323
pmc: PMC9796251
doi:
Substances chimiques
Retroelements
0
Banques de données
Dryad
['10.5061/dryad.4j0zpc8f4']
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
433-446Subventions
Organisme : Biotechnology and Biological Sciences Research Council
ID : BB/S019669/1
Pays : United Kingdom
Informations de copyright
© 2022 The Authors. New Phytologist © 2022 New Phytologist Foundation.
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