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First published online August 13, 2004; 10.1104/pp.104.048116 Plant Physiology 135:2012-2024 (2004) © 2004 American Society of Plant Biologists Combined Transcript and Metabolite Analysis Reveals Genes Involved in Spider Mite Induced Volatile Formation in Cucumber Plants1Plant Research International, 6700 AA Wageningen, The Netherlands (P.M., I.R.K., F.W.A.V., O.V., H.J.B.); and Laboratory of Entomology, Wageningen University, 6700 EH Wageningen, The Netherlands (I.F.K., M.D.)
Many plants have an indirect defense against herbivores by emitting volatiles that attract carnivorous enemies of the herbivores. In cucumber (Cucumis sativus) the production of carnivore attractants can be induced by herbivory or jasmonic acid spraying. From the leaves of cucumber plants with and without spider mite infestation, two subtractive cDNA libraries were made that were enriched in cDNA fragments up- or down-regulated by spider mite infestation. A total of 713 randomly selected clones from these libraries were used to make a cDNA microarray. Subsequently, cucumber plants were sprayed with jasmonic acid, mechanically damaged, infested with spider mites, or left untreated (control). Leaf samples were taken at a range of different time points, and induced volatile compounds and mRNA (from the same leaves) were collected. cDNAs prepared from the mRNA were hybridized to the clones on the microarray. The resulting gene expression profiles were analyzed in combination with volatile production data in order to gain insight in the possible involvement of the studied genes in the synthesis of those volatiles. The clones on the microarray and the induced cucumber volatiles could be grouped into a number of clusters in which specific biosynthetic genes clustered with the product of that pathway. For example, lipoxygenase cDNA clones clustered with the volatile (Z)-3-hexenyl acetate and the volatile sesquiterpene (E,E)-
1 This work was supported by a Marie Curie Individual Fellowship (MCFI200001234 to P.M.), by the Dutch Ministry of Agriculture, Nature Management and Fisheries (DWK 333 to F.W.A.V. and H.J.B.), and by the Dutch Technology Foundation (STW project WPB.5479 to I.F.K.). 2 Present address: Department of Chemistry and Biomedical Sciences, Kalmar University, P.O. Box 905, 39129 Kalmar, Sweden. Article, publication date, and citation information can be found at www.plantphysiol.org/cgi/doi/10.1104/pp.104.048116. * Corresponding author; e-mail harro.bouwmeester{at}wur.nl; fax 31317418094. Received June 11, 2004; returned for revision June 25, 2004; accepted June 27, 2004. This article has been cited by other articles:
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