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Gene expression data for body versus head samples for detection of genes with enriched expression in salivary glands of the spider mite Tetranychus urticae

ABSTRACT: Proteins produced in the salivary glands of arthropod herbivores can function as effectors to modify plant defense responses. To obtain a set of candidate, salivary gland specific genes for the mite herbivore Tetranychus urticae, mites were dissected and the head region was recovered. Specifically, the proterosoma was dissected from 250 mites. This includes the salivary glands, and other nearby tissue (given their small size, exact micro-dissection of salivary glands was not possible). As a reference for assessing differential expression to identify genes that might be salivary gland specific, three replicates of 100 whole mites were used. Female mites, which are much larger than males, were used in all cases for collection of RNA.

ORGANISM(S): Tetranychus urticae

PROVIDER: GSE81128 | GEO | 2016/10/10

SECONDARY ACCESSION(S): PRJNA320686

REPOSITORIES: GEO

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Project description:While pathogen-induced immunity is comparatively well characterized, far less is known about plant defense responses to arthropod herbivores. To date, most molecular-genetic studies of plant-arthropod interactions have focused on insects. However, plant-feeding (phytophagous) mites are also pests of diverse plants, and mites induce different patterns of damage to plant tissues than do well-studied insects (e.g., Lepidopteran larvae or aphids). The two-spotted spider mite, Tetranychus urticae, is among the most significant mite pests in agriculture. T. urticae is an extreme generalist that has been documented on a staggering number of plant hosts (more than 1,100), and is renowned for the rapid evolution of pesticide resistance. To understand reciprocal interactions between T. urticae and a plant host at the molecular level, we examined mite herbivory using Arabidopsis thaliana. Despite differences in feeding guilds, we found that transcriptional responses of A. thaliana to mite herbivory generally resembled those observed for insect herbivores. In particular, defense to mites was mediated by jasmonic acid (JA) biosynthesis and signaling. Further, indole glucosinolates dramatically increased mite mortality and development times. Variation in both basal and activated levels of these defense pathways might also explain differences in mite damage and feeding success between A. thaliana accessions. On the herbivore side, a diverse set of genes associated with detoxification of xenobiotics was induced upon exposure to increasing levels of in planta indole glucosinolates. Our findings provide molecular insights into the nature of, and response to, herbivory for a representative of a major class of arthropod herbivores. We used microarray to assess global gene expresion in Arabidopsis thaliana upon Tetranychus urticae attack in two A. thaliana accessions: Bla-2, resistant to spider mite herbivory and Kon, susceptible to spider mite herbivory. 3 week old Arabidopsis thaliana plants were subjected to Tetranychus urticae attack through application of 10 mites for various periods of time (timecourse scenario) or hundreds of mites for 1 hour (feeding site scenario).

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Gene expression data for body versus head samples for detection of genes with enriched expression in salivary glands of the spider mite Tetranychus urticae

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