Variation in mitochondrial DNA reveals multiple distant glacial refugia in black spruce (Picea mariana), a transcontinental North American conifer
Por:
Jaramillo-Correa J.P., Beaulieu J., Bousquet J.
Publicada:
1 ene 2004
Resumen:
Range-wide genetic variation of black spruce (Picea mariana) was studied using polymerase chain reaction-random fragment length polymorphism markers of the mitochondrial genome. Four polymorphic mitochondrial DNA (mtDNA) loci were surveyed and two or three alleles were detected at each locus, resulting in 10 multilocus mtDNA types or mitotypes. A significant subdivision of population genetic diversity was detected (GST = 0.671; NST = 0.726), suggesting low levels of gene flow among populations. The distribution of mitotypes was not random (NST > GST; P < 0.05) and revealed four partially overlapping zones, presumably representative of different glacial populations. Comparison of the genetic structure derived from mtDNA markers and the colonization paths previously deduced from the fossil and pollen records allow us to infer at least three southern and one northeastern glacial populations for black spruce. The patterns revealed in this study suggest that black spruce shares its biogeographical history with other forest-associated North American species.
Filiaciones:
Jaramillo-Correa J.P.:
Chaire Rech. Canada Genomique F., Ctr. de Rech. en Biol. Forestiere, Université Laval, Sainte-Foy, Que. G1K 7P4, Canada
Beaulieu J.:
Chaire Rech. Canada Genomique F., Ctr. de Rech. en Biol. Forestiere, Université Laval, Sainte-Foy, Que. G1K 7P4, Canada
Natural Resources Canada, Canadian Forest Service, 1055 Rue du P.E.P.S, Sainte-Foy, Que. G1V 4C7, Canada
Bousquet J.:
Chaire Rech. Canada Genomique F., Ctr. de Rech. en Biol. Forestiere, Université Laval, Sainte-Foy, Que. G1K 7P4, Canada
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