| Title: | The neonicotinoid insecticide thiamethoxam enhances expression of stress-response genes in Zea mays in an environmentally specific pattern |
| Author(s): | House MA; Swanton CJ; Lukens LN; |
| Address: | "Department of Plant Sciences, University of Saskatchewan, 51 Campus Drive, Saskatoon, SK S7N 5A8, Canada. Department of Plant Agriculture, University of Guelph, 50 Stone Rd. East, Guelph, ON N1G 2W1, Canada" |
| ISSN/ISBN: | 1480-3321 (Electronic) 0831-2796 (Linking) |
| Abstract: | "Recent studies indicate that thiamethoxam (TMX), a neonicotinoid insecticide, can affect plant responses to environmental stressors, such as neighboring weeds. The molecular mechanisms behind both stable and environmentally specific responses to TMX likely involve genes related to defense and stress responses. We investigated the effect of a TMX seed treatment on global gene expression in maize coleoptiles both under normal conditions and under low ratio red to far-red (R:FR) light stress induced by the presence of neighboring plants. The neighboring plant treatment upregulated genes involved in biotic and abiotic stress responses and affected specific photosynthesis and cell-growth related genes. Low R:FR light may enhance maize resistance to herbivores and pathogens. TMX appears to compromise resistance. The TMX treatment stably repressed many genes that encode proteins involved in biotic stress responses, as well as cell-growth genes. Notably, TMX effects on many genes' expression were conditional on the environment. In response to low R:FR, plants treated with TMX engage genes in the JA pathway, as well as other stress-related response pathways. Neighboring weeds may condition TMX-treated plants to become more stress tolerant" |
| Keywords: | "Gene Expression Regulation, Plant/drug effects Insecticides/*pharmacology Neonicotinoids/*pharmacology Plant Weeds/drug effects Seeds/drug effects Stress, Physiological/drug effects/*genetics/physiology Thiamethoxam/*pharmacology Zea mays/*drug effects/*g;" |
| Notes: | "MedlineHouse, Megan A Swanton, Clarence J Lukens, Lewis N eng Canada 2020/11/27 Genome. 2021 May; 64(5):567-579. doi: 10.1139/gen-2020-0110. Epub 2020 Nov 26" |
