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Ecological speciation in sympatric palms: 1. Gene expression, selection and pleiotropy

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Title: Ecological speciation in sympatric palms: 1. Gene expression, selection and pleiotropy
Authors: Dunning, LT
Hipperson, H
Baker, WJ
Butlin, RK
Devaux, C
Hutton, I
Igea, J
Papadopulos, AST
Quan, X
Smadja, CM
Turnbull, CGN
Savolainen, V
Item Type: Journal Article
Abstract: Ecological speciation requires divergent selection, reproductive isolation, and a genetic mechanism to link the two. We examined the role of gene expression and coding sequence evolution in this process using two species of Howea palms that have diverged sympatrically on Lord Howe Island, Australia. These palms are associated with distinct soil types and have displaced flowering times, representing an ideal candidate for ecological speciation. We generated large amounts of RNA-Seq data from multiple individuals and tissue types collected on the island from each of the two species. We found that differentially expressed loci as well as those with divergent coding sequences between Howea species were associated with known ecological and phenotypic differences, including response to salinity, drought, pH and flowering time. We identified loci with potential dual function in flowering time and soil adaptation, which effect on flowering time was validated by knocking orthologous genes in a model plant species. These results indicate that pleiotropy could have favoured the evolution of barrier traits in this system, despite ongoing gene flow.
Issue Date: 3-Jun-2016
Date of Acceptance: 11-May-2016
URI: http://hdl.handle.net/10044/1/32433
DOI: https://dx.doi.org/10.1111/jeb.12895
ISSN: 1420-9101
Publisher: Wiley
Start Page: 1472
End Page: 1487
Journal / Book Title: Journal of Evolutionary Biology
Volume: 29
Issue: 8
Copyright Statement: © 2016 THE AUTHORS. THIS IS AN OPEN ACCESS ARTICLE UNDER THE TERMS OF THE CREATIVE CO MMONS ATTRIBUTION LICENSE, WHICH PERMITS USE, DISTRIBUTION AND REPRODUCTION IN ANY MEDIUM, PROVIDED THE ORIGINAL WORK IS PROPERLY CITED.
Sponsor/Funder: Commission of the European Communities
Natural Environment Research Council (NERC)
Commission of the European Communities
The Leverhulme Trust
Funder's Grant Number: 233190
NE/M015742/1
641211
RF-2016-373/2
Keywords: Lord Howe Island
positive selection
sympatric speciation
transcriptomics
Evolutionary Biology
0603 Evolutionary Biology
0608 Zoology
Publication Status: Published
Appears in Collections:Faculty of Natural Sciences



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