Geographic structure and adaptive population differentiation in herbivore defence genes in European aspen (Populus tremula L., Salicaceae)
2012 (English)In: Molecular Ecology, ISSN 0962-1083, E-ISSN 1365-294X, Vol. 21, no 9, 2197-2207 p.Article in journal (Refereed) Published
When a phenotypic trait is subjected to spatially variable selection and local adaptation, the underlying genes controlling the trait are also expected to show strong patterns of genetic differentiation since alternative alleles are favored in different geographical locations. Here we study 71 SNPs from seven genes associated with inducible defense responses in a sample of P. tremula collected from across Sweden. Four of these genes (PPO2, TI2, TI4 and TI5) show substantial population differentiation and a PCA conducted on the defense SNPs divides the Swedish population into three distinct clusters. Several defense SNPs show latitudinal clines, although these were not robust to multiple testing. However, five SNPs (located within TI4 and TI5) show strong longitudinal clines that remain significant after multiple test correction. Genetic geographical variation, supporting local adaptation, has earlier been confirmed in genes involved in the photoperiod pathway in P. tremula, but this is, to our knowledge, one of the first times that geographic variation has been found in genes involved in plant defense against antagonists.
Place, publisher, year, edition, pages
Blackwell Publishing, 2012. Vol. 21, no 9, 2197-2207 p.
adaptation, herbivore defence, population genetics, population structure, Populus
Genetics Evolutionary Biology
Research subject evolutionär genetik
IdentifiersURN: urn:nbn:se:umu:diva-54299DOI: 10.1111/j.1365-294X.2012.05524.xOAI: oai:DiVA.org:umu-54299DiVA: diva2:517571