| Title: | Plant growth regulator-mediated anti-herbivore responses of cabbage (Brassica oleracea) against cabbage looper Trichoplusia ni Hubner (Lepidoptera: Noctuidae) |
| Author(s): | Scott IM; Samara R; Renaud JB; Sumarah MW; |
| Address: | "Agriculture and Agri-Food Canada, London Research and Development Centre, 1391 Sandford St., London, ON N5V 4T3, Canada. Electronic address: ian.scott@agr.gc.ca. Faculty of Agricultural Science and Technology, Palestine Technical University-Kadoorie (PTUK), P.O. BOX 7, Tulkarm, West Bank, Palestine. Agriculture and Agri-Food Canada, London Research and Development Centre, 1391 Sandford St., London, ON N5V 4T3, Canada" |
| DOI: | 10.1016/j.pestbp.2016.10.005 |
| ISSN/ISBN: | 1095-9939 (Electronic) 0048-3575 (Linking) |
| Abstract: | "Plant elicitors can be biological or chemical-derived stimulators of jasmonic acid (JA) or salicylic acid (SA) pathways shown to prime the defenses in many crops. Examples of chemical elicitors of the JA and SA pathways include methyl-jasmonate and 1,2,3-benzothiadiazole-7-carbothioate (BTH or the commercial plant activator Actigard 50WG, respectively). The use of specific elicitors has been observed to affect the normal interaction between JA and SA pathways causing one to be upregulated and the other to be suppressed, often, but not always, at the expense of the plant's herbivore or pathogen defenses. The objective of this study was to determine whether insects feeding on Brassica crops might be negatively affected by SA inducible defenses combined with an inhibitor of detoxification and anti-oxidant enzymes that regulate the insect response to the plant's defenses. The relative growth rate of cabbage looper Trichoplusia ni Hubner (Lepidoptera: Noctuidae) fed induced cabbage Brassica oleraceae leaves with the inhibitor, quercetin, was significantly less than those fed control cabbage with and without the inhibitor. The reduced growth was related to the reduction of glutathione S-transferases (GSTs) by the combination of quercetin and increased levels of indole glucosinolates in the cabbage treated with BTH at 2.6x the recommended application rate. These findings may offer a novel combination of elicitor and synergist that can provide protection from plant disease and herbivores in cabbage and other Brassica crops" |
| Keywords: | Animals Brassica/*metabolism/*parasitology Glucosinolates/metabolism Glutathione Transferase/metabolism Herbivory/drug effects Indoles/metabolism Lepidoptera/*drug effects/pathogenicity Plant Growth Regulators/*pharmacology Plant Leaves/metabolism/parasit; |
| Notes: | "MedlineScott, Ian M Samara, R Renaud, J B Sumarah, M W eng 2017/09/16 Pestic Biochem Physiol. 2017 Sep; 141:9-17. doi: 10.1016/j.pestbp.2016.10.005. Epub 2016 Nov 2" |
