| Title: | "Induction of silicon defences in wheat landraces is local, not systemic, and driven by mobilization of soluble silicon to damaged leaves" |
| Author(s): | Thorne SJ; Maathuis FJM; Hartley SE; |
| Address: | "Plants, Photosynthesis, and Soil, School of Biosciences, University of Sheffield, Sheffield, S10 2TN, UK. Department of Biology, University of York, York, YO10 5DD, UK" |
| ISSN/ISBN: | 1460-2431 (Electronic) 0022-0957 (Linking) |
| Abstract: | "In response to herbivory, many grasses, including crops such as wheat, accumulate significant levels of silicon (Si) as an antiherbivore defence. Damage-induced increases in Si can be localized in damaged leaves or be more systemic, but the mechanisms leading to these differences in Si distribution remain untested. Ten genetically diverse wheat landraces (Triticum aestivum) were used to assess genotypic variation in Si induction in response to mechanical damage and how this was affected by exogenous Si supply. Total and soluble Si levels were measured in damaged and undamaged leaves as well as in the phloem to test how Si was allocated to different parts of the plant after damage. Localized, but not systemic, induction of Si defences occurred, and was more pronounced when plants had supplemental Si. Damaged plants had significant increases in Si concentration in their damaged leaves, while the Si concentration in undamaged leaves decreased, such that there was no difference in the average Si concentration of damaged and undamaged plants. The increased Si in damaged leaves was due to the redirection of soluble Si, present in the phloem, from undamaged to damaged plant parts, potentially a more cost-effective defence mechanism for plants than increased Si uptake" |
| Keywords: | *Triticum/metabolism *Silicon/metabolism Poaceae/metabolism Plants/metabolism Herbivory Plant Leaves/metabolism Damage genotypic variation localized response phloem reallocation silicon wheat (Triticum aestivum); |
| Notes: | "MedlineThorne, Sarah J Maathuis, Frans J M Hartley, Susan E eng 1949569/BB_/Biotechnology and Biological Sciences Research Council/United Kingdom Research Support, Non-U.S. Gov't England 2023/06/14 J Exp Bot. 2023 Sep 13; 74(17):5363-5373. doi: 10.1093/jxb/erad224" |
