Host genetics and environment drive divergent responses of two resource sharing gall-formers on Norway spruce

A common garden analysis

E. Petter Axelsson, Glenn R. Iason, Riitta Julkunen-Tiitto, Thomas G Whitham

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

A central issue in the field of community genetics is the expectation that trait variation among genotypes play a defining role in structuring associated species and in forming community phenotypes. Quantifying the existence of such community phenotypes in two common garden environments also has important consequences for our understanding of gene-by-environment interactions at the community level. The existence of community phenotypes has not been evaluated in the crowns of boreal forest trees. In this study we address the influence of tree genetics on needle chemistry and genetic x environment interactions on two gall-inducing adelgid aphids (Adelges spp. and Sacchiphantes spp.) that share the same elongating bud/shoot niche. We examine the hypothesis that the canopies of different genotypes of Norway spruce (Picea abies L.) support different community phenotypes. Three patterns emerged. First, the two gallers show clear differences in their response to host genetics and environment. Whereas genetics significantly affected the abundance of Adelges spp. galls, Sacchiphantes spp. was predominately affected by the environment suggesting that the genetic influence is stronger in Adelges spp. Second, the among family variation in genetically controlled resistance was large, i.e. fullsib families differed as much as 10 fold in susceptibility towards Adelges spp. (0.57 to 6.2 galls/branch). Also, the distribution of chemical profiles was continuous, showing both overlap as well as examples of significant differences among fullsib families. Third, despite the predicted effects of host chemistry on galls, principal component analyses using 31 different phenolic substances showed only limited association with galls and a similarity test showed that trees with similar phenolic chemical characteristics, did not host more similar communities of gallers. Nonetheless, the large genetic variation in trait expression and clear differences in how community members respond to host genetics supports our hypothesis that the canopies of Norway spruce differ in their community phenotypes.

Original languageEnglish (US)
Article numbere0142257
JournalPLoS One
Volume10
Issue number11
DOIs
StatePublished - Nov 10 2015

Fingerprint

Norway
galls
Adelges
Picea abies
gardens
Phenotype
Sacchiphantes
phenotype
Genotype
Abies
Picea
Gene-Environment Interaction
Aphids
chemistry
Principal Component Analysis
canopy
Crowns
Needles
genotype
Genes

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Medicine(all)

Cite this

Host genetics and environment drive divergent responses of two resource sharing gall-formers on Norway spruce : A common garden analysis. / Petter Axelsson, E.; Iason, Glenn R.; Julkunen-Tiitto, Riitta; Whitham, Thomas G.

In: PLoS One, Vol. 10, No. 11, e0142257, 10.11.2015.

Research output: Contribution to journalArticle

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