Diverging patterns of mitochondrial and nuclear DNA diversity in subarctic black spruce: imprint of a founder effect associated with postglacial colonization

Molecular Ecology
Isabelle GamacheJ Bousquet

Abstract

High-latitude ecotonal populations at the species margins may exhibit altered patterns of genetic diversity, resulting from more or less recent founder events and from bottleneck effects in response to climate oscillations. Patterns of genetic diversity were investigated in nine populations of the conifer black spruce (Picea mariana [Mill.] BSP.) in northwestern Québec, Canada, using seed-dispersed mitochondrial (mt) DNA and nuclear (nc) DNA. mtDNA diversity (mitotypes) was assessed at three loci, and ncDNA diversity was estimated for nine expressed sequence tag polymorphism (ESTP) loci. Sampling included populations from the boreal forest and the southern and northern subzones of the subarctic forest-tundra, a fire-born ecotone. For ncDNA, populations from all three vegetation zones were highly diverse with little population differentiation (thetaN = 0.014); even the northernmost populations showed no loss of rare alleles. Patterns of mitotype diversity were strikingly different: within-population diversity and population differentiation were high for boreal forest populations [expected heterozygosity per locus (HE) = 0.58 and thetaM = 0.529], but all subarctic populations were fixed for a single mitotype (HE = 0). This lack o...Continue Reading

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Citations

Apr 21, 2010·Biochemical Genetics·Meng-Ben Wang, Zhen-Zhen Hao
Aug 9, 2006·Proceedings of the National Academy of Sciences of the United States of America·Lynn L AndersonKen N Paige
Jul 19, 2012·Molecular Ecology·Julien PrunierJean Bousquet
Mar 20, 2010·Evolution; International Journal of Organic Evolution·Yong Feng ZhouJian Quan Liu
Nov 28, 2006·Molecular Phylogenetics and Evolution·M S AscunceM D Mudry
Dec 26, 2018·PhytoKeys·Emmanuele FarrisPeter de Lange

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