Genetics, Vol. 156, 1309-1322, November 2000, Copyright © 2000

Genetic Basis of Climatic Adaptation in Scots Pine by Bayesian Quantitative Trait Locus Analysis

Päivi Hurmea, Mikko J. Sillanpääb, Elja Arjasb, Tapani Repoc, and Outi Savolainena
a Department of Biology, FIN-90014 University of Oulu, Finland,
b Rolf Nevanlinna Institute, FIN-00014 University of Helsinki, Finland
c Faculty of Forestry, University of Joensuu, FIN-80101 Joensuu, Finland

Corresponding author: Päivi Hurme, Department of Biology, P.O. Box 3000, FIN-90014 University of Oulu, Finland., paivi.hurme{at}oulu.fi (E-mail)

Communicating editor: Z-B. ZENG

We examined the genetic basis of large adaptive differences in timing of bud set and frost hardiness between natural populations of Scots pine. As a mapping population, we considered an "open-pollinated backcross" progeny by collecting seeds of a single F1 tree (cross between trees from southern and northern Finland) growing in southern Finland. Due to the special features of the design (no marker information available on grandparents or the father), we applied a Bayesian quantitative trait locus (QTL) mapping method developed previously for outcrossed offspring. We found four potential QTL for timing of bud set and seven for frost hardiness. Bayesian analyses detected more QTL than ANOVA for frost hardiness, but the opposite was true for bud set. These QTL included alleles with rather large effects, and additionally smaller QTL were supported. The largest QTL for bud set date accounted for about a fourth of the mean difference between populations. Thus, natural selection during adaptation has resulted in selection of at least some alleles of rather large effect.




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