Molecular signatures of divergence and selection in closely related pine taxa

Wachowiak, Witold; Zaborowska, Julia; Labiszak, Bartosz; Perry, Annika; Zucca, Giovanni M.; González-Martínez, Santiago C.; Cavers, Stephen. 2018 Molecular signatures of divergence and selection in closely related pine taxa. Tree Genetics & Genomes, 14 (6), 83. 11, pp.

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Efforts to detect loci under selection in plants have mostly focussed on single species. However, assuming that intraspecific divergence may lead to speciation, comparisons of genetic variation within and among recently diverged taxa can help to locate such genes. In this study, coalescent and outlier detection methods were used to assess nucleotide polymorphism and divergence at 79 nuclear gene fragments (1212 SNPs) in 16 populations (153 individuals) of the closely related, but phenotypically and ecologically distinct, pine taxa Pinus mugo, P. uliginosa and P. uncinata across their European distributions. Simultaneously, mitochondrial DNA markers, which are maternally inherited in pines and distributed by seeds at short geographic distance, were used to assess genetic relationships of the focal populations and taxa. The majority of nuclear loci showed homogenous patterns of variation between the taxa due to a high number of shared SNPs and haplotypes, similar levels of polymorphism, and low net divergence. However, against this common genetic background and an overall low population structure within taxa at mitochondrial markers, we identified several genes showing signatures of selection, accompanied by significant intra- and interspecific divergence. Our results indicate that loci involved in species divergence may be involved in intraspecific local adaptation.

Item Type: Publication - Article
Digital Object Identifier (DOI):
UKCEH and CEH Sections/Science Areas: Biodiversity (Science Area 2017-)
ISSN: 1614-2942
Additional Information. Not used in RCUK Gateway to Research.: Open Access paper - full text available via Official URL link.
Additional Keywords: nucleotide polymorphisms, nuclear loci, mtDNA, local adaptation, DNA sequencing, speciation
NORA Subject Terms: Botany
Date made live: 12 Nov 2018 13:59 +0 (UTC)

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