Journal of Chemical Ecology

, Volume 38, Issue 8, pp 992–995 | Cite as

Evolutionary Potential of Root Chemical Defense: Genetic Correlations with Shoot Chemistry and Plant Growth

  • J. D. Parker
  • J.-P. Salminen
  • Anurag A. Agrawal
Rapid Communication

Abstract

Root herbivores can affect plant fitness, and roots often contain the same secondary metabolites that act as defenses in shoots, but the ecology and evolution of root chemical defense have been little investigated. Here, we investigated genetic variance, heritability, and correlations among defensive phenolic compounds in shoot vs. root tissues of common evening primrose, Oenothera biennis. Across 20 genotypes, there were roughly similar concentrations of total phenolics in shoots vs. roots, but the allocation of particular phenolics to shoots vs. roots varied along a continuum of genotype growth rate. Slow-growing genotypes allocated 2-fold more of the potential pro-oxidant oenothein B to shoots than roots, whereas fast-growing genotypes had roughly equivalent above and belowground concentrations. Phenolic concentrations in both roots and shoots were strongly heritable, with mostly positive patterns of genetic covariation. Nonetheless, there was genotype-specific variation in the presence/absence of two major ellagitannins (oenothein A and its precursor oenothein B), indicating two different chemotypes based on alterations in this chemical pathway. Overall, the presence of strong genetic variation in root defenses suggests ample scope for the evolution of these compounds as defenses against root herbivores.

Keywords

Allocation Below-ground Chemical defense Growth Phenolics Roots Trade-off 

Supplementary material

10886_2012_163_MOESM1_ESM.docx (14 kb)
Table S1(DOCX 14 kb)
10886_2012_163_MOESM2_ESM.xlsx (21 kb)
Table S2(XLSX 21 kb)

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Copyright information

© Springer Science+Business Media, LLC (outside the USA) 2012

Authors and Affiliations

  • J. D. Parker
    • 1
  • J.-P. Salminen
    • 2
  • Anurag A. Agrawal
    • 3
  1. 1.Smithsonian Environmental Research CenterEdgewaterUSA
  2. 2.Laboratory of Organic Chemistry and Chemical Biology, Department of ChemistryUniversity of TurkuTurkuFinland
  3. 3.Department of Ecology and Evolutionary BiologyCornell UniversityIthacaUSA

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