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Plant Cell Physiol

Title:		Light Intensity-Mediated Induction of Trichome-Associated Allelochemicals Increases Resistance Against Thrips in Tomato
Author(s):		Escobar-Bravo R; Ruijgrok J; Kim HK; Grosser K; van Dam NM; Klinkhamer PGL; Leiss KA;
Address:		"Plant Science and Natural Products, Institute of Biology Leiden (IBL), Leiden University, Sylviusweg 72, BE Leiden, The Netherlands. Molecular Interaction Ecology, German Center for Integrative Biodiversity Research (iDiv), Halle-Gena-Leipzig, Deutscher Platz 5e, Leipzig, Germany. Friedrich Schiller University Jena, Institute of Biodiversity, Dornburger-Str. 159, Jena, Germany"
Journal Title:		Plant Cell Physiol
Year:		2018
Volume:		59
Issue:		12
Page Number:		2462 - 2475
DOI:		10.1093/pcp/pcy166
ISSN/ISBN:		1471-9053 (Electronic) 0032-0781 (Print) 0032-0781 (Linking)
Abstract:		"In cultivated tomato (Solanum lycopersicum), increases in photosynthetically active radiation (PAR) induce type VI leaf glandular trichomes, which are important defensive structures against arthropod herbivores. Yet, how PAR affects the type VI trichome-associated leaf chemistry and its biological significance with respect to other photomorphogenic responses in this agronomically important plant species is unknown. We used the type VI trichome-deficient tomato mutant odorless-2 (od-2) and its wild type to investigate the influence of PAR on trichome-associated chemical defenses against thrips (Frankliniella occidentalis). High PAR increased thrips resistance in wild-type plants, but not in od-2. Furthermore, under high PAR, thrips preferred od-2 over the wild type. Both genotypes increased type VI trichome densities under high PAR. Wild-type plants, however, produced more trichome-associated allelochemicals, i.e. terpenes and phenolics, these being undetectable or barely altered in od-2. High PAR increased leaf number and thickness, and induced profound but similar metabolomic changes in wild-type and od-2 leaves. Enhanced PAR also increased levels of ABA in wild-type and od-2 plants, and of auxin in od-2, while the salicylic acid and jasmonate concentrations were unaltered. However, in both genotypes, high PAR induced the expression of jasmonic acid-responsive defense-related genes. Taken together, our results demonstrate that high PAR-mediated induction of trichome-associated chemical defenses plays a prominent role in tomato-thrips interactions"
Keywords:		"Abscisic Acid/metabolism Animals Cyclopentanes/metabolism *Disease Resistance Fatty Acids, Unsaturated/metabolism Gene Expression Regulation, Plant Genotype Indoleacetic Acids/metabolism *Light Solanum lycopersicum/genetics/growth & development/*parasitol;"
Notes:		"MedlineEscobar-Bravo, Rocio Ruijgrok, Jasmijn Kim, Hye Kyong Grosser, Katharina Van Dam, Nicole M Klinkhamer, Peter G L Leiss, Kirsten A eng Japan 2018/08/21 Plant Cell Physiol. 2018 Dec 1; 59(12):2462-2475. doi: 10.1093/pcp/pcy166"