Journal
PLANT AND CELL PHYSIOLOGY
Volume 58, Issue 3, Pages 622-634Publisher
OXFORD UNIV PRESS
DOI: 10.1093/pcp/pcx014
Keywords
Frankliniella occidentalis; Jasmonic acid; Thrips; Tomato; Trichomes; Volatiles
Categories
Funding
- STW Perspective program 'Green Defense against Pests' (GAP) [13553]
- Rijk Zwaan
- Duemmen Orange
- Dekker Chrysanten
- Fides
- Incotec
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Plant defenses inducible by herbivorous arthropods can determine performance of subsequent feeding herbivores. We investigated how infestation of tomato ( Solanum lycopersicum) plants with the Western flower thrips (Frankliniella occidentalis) alters host plant suitability and foraging decisions of their conspecifics. We explored the role of delayedinduced jasmonic acid (JA)-mediated plant defense responses in thrips preference by using the tomato mutant def-1, impaired in JA biosynthesis. In particular, we investigated the effect of thrips infestation on trichome-associated tomato defenses. The results showed that when offered a choice, thrips preferred non-infested plants over infested wild-type plants, while no differences were observed in def-1. Exogenous application of methyl jasmonate restored the repellency effect in def-1. Gene expression analysis showed induction of the JA defense signaling pathway in wild-type plants, while activating the ethylene signaling pathway in both genotypes. Activation of JA defenses led to increases in type-VI leaf glandular trichome densities in the wild type, augmenting the production of trichome-associated volatiles, i. e. terpenes. Our study revealed that plantmediated intraspecific interactions between thrips are determined by JA- mediated defenses in tomato. We report that insects can alter not only trichome densities but also the allelochemicals produced therein, and that this response might depend on the magnitude and/ or type of the induction.
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