| Title: | Tetranychus urticae-triggered responses promote genotype-dependent conspecific repellence or attractiveness in citrus |
| Author(s): | Agut B; Gamir J; Jaques JA; Flors V; |
| Address: | "Departament de Ciencies Agraries i del Medi Natural, Unitat Associada d'Entomologia IVIA-UJI, Universitat Jaume I (UJI), Campus del Riu Sec, E-12071, Castello de la Plana, Spain. Departament de Ciencies Agraries i del Medi Natural, Metabolic Integration and Cell Signalling Group, Universitat Jaume I (UJI), Campus del Riu Sec, E-12071, Castello de la Plana, Spain" |
| ISSN/ISBN: | 1469-8137 (Electronic) 0028-646X (Linking) |
| Abstract: | "The citrus rootstocks sour orange and Cleopatra mandarin display differential resistance against Tetranychus urticae. Sour orange plants support reduced oviposition, growth rates and damage compared with Cleopatra mandarin plants. Jasmonic acid signalling and flavonoid accumulation have been revealed as key mechanisms for the enhanced resistance of sour orange plants. In this study, we observed that the release of T. urticae herbivore-induced plant volatiles (HIPVs) from sour orange plants has a marked repellent effect on conspecific mites associated with the production of the terpenes alpha-ocimene, alpha-farnesene, pinene and d-limonene, and the green leaf volatile 4-hydroxy-4-methyl-2-pentanone. By contrast, T. urticae HIPVs from Cleopatra mandarin plants promote conspecific mite attraction associated with an increase in (2-butoxyethoxy) ethanol, benzaldehyde and methyl salicylate levels. HIPVs released from sour orange plants following T. urticae infestation induce resistance in Cleopatra mandarin plants, thereby reducing oviposition rates and stimulating the oxylipin biosynthetic gene lipoxygenase2 (LOX2). Cleopatra HIPVs do not affect the response to T. urticae of these rootstocks. We conclude that sour orange plants promote herbivore-induced resistance in Cleopatra mandarin plants and, despite the weak basal resistance of these rootstocks, herbivore resistance can be induced through the combination of HIPVs, such as alpha-ocimene and d-limonene" |
| Keywords: | "Animals Chromatography, High Pressure Liquid Citrus/drug effects/*genetics/*parasitology Cyclopentanes/pharmacology Disease Resistance Fatty Acids, Unsaturated/pharmacology Gene Expression Regulation, Plant/drug effects Genotype Herbivory/drug effects Ins;" |
| Notes: | "MedlineAgut, Blas Gamir, Jordi Jaques, Josep A Flors, Victor eng Research Support, Non-U.S. Gov't England 2015/03/17 New Phytol. 2015 Aug; 207(3):790-804. doi: 10.1111/nph.13357. Epub 2015 Mar 13" |
