| Title: | Inducibility of Plant Secondary Metabolites in the Stem Predicts Genetic Variation in Resistance Against a Key Insect Herbivore in Maritime Pine |
| Author(s): | Lopez-Goldar X; Villari C; Bonello P; Borg-Karlson AK; Grivet D; Zas R; Sampedro L; |
| Address: | "Mision Biologica de Galicia, Consejo Superior de Investigaciones Cientificas, Pontevedra, Spain. Department of Plant Pathology, The Ohio State University, Columbus, OH, United States. Ecological Chemistry Group, Department of Chemistry, Royal Institute of Technology, Stockholm, Sweden. Department of Forest Ecology and Genetics, Forest Research Centre, INIA, Madrid, Spain. Daniel B. Warnell School of Forestry and Natural Resources, University of Georgia, Athens, GA, United States. Sustainable Forest Management Research Institute, INIA-University of Valladolid, Palencia, Spain" |
| ISSN/ISBN: | 1664-462X (Print) 1664-462X (Electronic) 1664-462X (Linking) |
| Abstract: | "Resistance to herbivores and pathogens is considered a key plant trait with strong adaptive value in trees, usually involving high concentrations of a diverse array of plant secondary metabolites (PSM). Intraspecific genetic variation and plasticity of PSM are widely known. However, their ecology and evolution are unclear, and even the implication of PSM as traits that provide direct effective resistance against herbivores is currently questioned. We used control and methyl jasmonate (MJ) induced clonal copies of genotypes within families from ten populations of the main distribution range of maritime pine to exhaustively characterize the constitutive and induced profile and concentration of PSM in the stem phloem, and to measure insect herbivory damage as a proxy of resistance. Then, we explored whether genetic variation in resistance to herbivory may be predicted by the constitutive concentration of PSM, and the role of its inducibility to predict the increase in resistance once the plant is induced. We found large and structured genetic variation among populations but not between families within populations in resistance to herbivory. The MJ-induction treatment strongly increased resistance to the weevil in the species, and the genetic variation in the inducibility of resistance was significantly structured among populations, with greater inducibility in the Atlantic populations. Genetic variation in resistance was largely explained by the multivariate concentration and profile of PSM at the genotypic level, rather than by bivariate correlations with individual PSM, after accounting for genetic relatedness among genotypes. While the constitutive concentration of the PSM blend did not show a clear pattern of resistance to herbivory, specific changes in the chemical profile and the increase in concentration of the PSM blend after MJ induction were related to increased resistance. To date, this is the first example of a comprehensive and rigorous approach in which inducibility of PSM in trees and its implication in resistance was analyzed excluding spurious associations due to genetic relatedness, often overlooked in intraspecific studies. Here we provide evidences that multivariate analyses of PSM, rather than bivariate correlations, provide more realistic information about the potentially causal relationships between PSM and resistance to herbivory in pine trees" |
| Keywords: | genetic variation herbivory inducibility maritime pine phenolics plant secondary metabolites (PSM) resistance terpenes; |
| Notes: | "PubMed-not-MEDLINELopez-Goldar, Xose Villari, Caterina Bonello, Pierluigi Borg-Karlson, Anna Karin Grivet, Delphine Zas, Rafael Sampedro, Luis eng Switzerland 2018/12/07 Front Plant Sci. 2018 Nov 21; 9:1651. doi: 10.3389/fpls.2018.01651. eCollection 2018" |
