Tracking the progression of speciation: variable patterns of introgression across the genome provide insights on the species delimitation between progenitor-derivative spruces (Picea mariana × P. rubens)

Molecular Ecology
Guillaume de LafontaineJean Bousquet

Abstract

The genic species concept implies that while most of the genome can be exchanged somewhat freely between species through introgression, some genomic regions remain impermeable to interspecific gene flow. Hence, interspecific differences can be maintained despite ongoing gene exchange within contact zones. This study assessed the heterogeneous patterns of introgression at gene loci across the hybrid zone of an incipient progenitor-derivative species pair, Picea mariana (black spruce) and Picea rubens (red spruce). The spruce taxa likely diverged in geographic isolation during the Pleistocene and came into secondary contact during late Holocene. A total of 300 SNPs distributed across the 12 linkage groups (LG) of black spruce were genotyped for 385 individual trees from 33 populations distributed across the allopatric zone of each species and within the zone of sympatry. An integrative framework combining three population genomic approaches was used to scan the genomes, revealing heterogeneous patterns of introgression. A total of 23 SNPs scattered over 10 LG were considered impermeable to introgression and putatively under diverging selection. These loci revealed the existence of impermeable genomic regions forming the species b...Continue Reading

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Citations

Nov 12, 2018·The New Phytologist·Shuo FengJianquan Liu
Mar 16, 2018·Biology Letters·Adriana Suarez-GonzalezQuentin C B Cronk
Jun 16, 2017·Ecology and Evolution·Guillaume de Lafontaine, Jean Bousquet
Oct 3, 2020·Evolutionary Applications·Thibaut CapblancqStephen R Keller
Feb 27, 2021·Molecular Phylogenetics and Evolution·Jorge Cruz-NicolásJuan P Jaramillo-Correa

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