| Title: | Impact of Soil Rhizobacteria Inoculation and Leaf-Chewing Insect Herbivory on Mentha piperita Leaf Secondary Metabolites |
| Author(s): | Del Rosario Cappellari L; Chiappero J; Palermo TB; Giordano W; Banchio E; |
| Address: | "INBIAS Instituto de Biotecnologia Ambiental y Salud (CONICET- Universidad Nacional de Rio Cuarto), Campus Universitario, 5800, Rio Cuarto, Argentina. INBIAS Instituto de Biotecnologia Ambiental y Salud (CONICET- Universidad Nacional de Rio Cuarto), Campus Universitario, 5800, Rio Cuarto, Argentina. ebanchio@exa.unrc.edu.ar" |
| DOI: | 10.1007/s10886-020-01193-3 |
| ISSN/ISBN: | 1573-1561 (Electronic) 0098-0331 (Linking) |
| Abstract: | "Secondary metabolites commonly play important physiological roles in plants and can be modified quantitatively and qualitatively by exposure to biotic and abiotic interactions. Plant growth promoting rhizobacteria (PGPR) and herbivory induce systemic resistance. In the present study, we analyzed the induction of secondary metabolites in peppermint plants in response to chewing insect herbivory on PGPR-inoculated Mentha piperita plants. The secondary metabolites of M. piperita plants were increased when plants were inoculated with PGPR and also exposed to caterpillar herbivory. It was found that the total essential oil yield in inoculated plants with insect damage was ~2.6-fold higher than in controls. The yield was similar to that of plants either damaged by insects or inoculated, indicating that there was no synergism. The same trend was observed for phenolic compounds. In contrast, VOC emissions were significantly higher in plants infested by insects, independent of whether they were inoculated. Insect damaged plants had 5.5 times higher monoterpene emissions than control plants, and ~ 2-fold higher emissions than on PGPR-inoculated plants without insects. To gain a better understanding of how herbivory on PGPR-inoculated plants can cause an increase in secondary metabolites of peppermint, we examined changes in plant defense hormones in inoculated plants after herbivory. We found that the combination of both treatments increased the endogenous jasmonic and salicylic acid levels to the same extent as in plants only inoculated or only insect-damaged. Because different interactions can alter the phytochemistry of plants such as M. piperita, this topic is both ecologically and economically relevant" |
| Keywords: | Animals Bacillus amyloliquefaciens/*physiology *Herbivory Larva Mentha piperita/*metabolism/microbiology Moths/*physiology Plant Leaves/metabolism/microbiology Pseudomonas putida/*physiology Secondary Metabolism Soil Microbiology Essential oil Herbivory P; |
| Notes: | "MedlineDel Rosario Cappellari, Lorena Chiappero, Julieta Palermo, Tamara Belen Giordano, Walter Banchio, Erika eng PICT636-14/Agencia Nacional de Promocion Cientifica y Tecnologica/ 2020/06/25 J Chem Ecol. 2020 Jul; 46(7):619-630. doi: 10.1007/s10886-020-01193-3. Epub 2020 Jun 24" |
