| Title: | Intraspecific differences in plant defense induction by fall armyworm strains |
| Author(s): | Acevedo FE; Peiffer M; Ray S; Meagher R; Luthe DS; Felton GW; |
| Address: | "Department of Entomology, Pennsylvania State University, University Park, PA, 16802, USA. Center for Medical, Agricultural and Veterinary Entomology, USDA-ARS, Gainesville, FL, 32608, USA. Department of Plant Science, Pennsylvania State University, University Park, PA, 16802, USA" |
| ISSN/ISBN: | 1469-8137 (Electronic) 0028-646X (Linking) |
| Abstract: | "The underlying adaptive mechanisms by which insect strains are associated with specific plants are largely unknown. In this study, we investigated the role of herbivore-induced defenses in the host plant association of fall armyworm (Spodoptera frugiperda) strains. We tested the expression of herbivore-induced defense-related genes and the activity of plant-defensive proteins in maize and Bermuda grass upon feeding by fall armyworm strains. The rice strain caterpillars induced greater accumulation of proteinase inhibitors in maize than the corn strain caterpillars. In Bermuda grass, feeding by the corn strain suppressed induction of trypsin inhibitor activity whereas the rice strain induced greater activity levels. Differences in elicitation of these plant defenses by the two strains seems to be due to differences in the activity levels of the salivary enzyme phospholipase C. The levels of plant defense responses were negatively correlated with caterpillar growth, indicating a fitness effect. Our results indicate that specific elicitors in the saliva of fall armyworm stains trigger differential levels of plant defense responses that affect caterpillar growth and thus may influence host plant associations in field conditions. The composition and secretion of plant defense elicitors may have a strong influence in the host plant association of insect herbivores" |
| Keywords: | Animals Body Weight Cynodon/*immunology/*parasitology Glucose Oxidase/metabolism Insect Proteins/metabolism Larva/growth & development *Plant Immunity Plant Leaves/parasitology Saliva/enzymology Species Specificity Spodoptera/*physiology Type C Phospholip; |
| Notes: | "MedlineAcevedo, Flor E Peiffer, Michelle Ray, Swayamjit Meagher, Robert Luthe, Dawn S Felton, Gary W eng Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. England 2018/01/15 New Phytol. 2018 Apr; 218(1):310-321. doi: 10.1111/nph.14981. Epub 2018 Jan 14" |
