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Involvement of sweet pepper Ca LOX2 in jasmonate-dependent induced defence against Western flower thrips

Journal of Integrative Plant Biology 2019年第10期61卷 1085-1098页

作者： Sandeep J Sarde Klaas Bouwmeester Jhon Venegas-Molina Anja David Wilhelm Boland Marcel Dicke Laboratory of Entomology Wageningen University P.O. Box 16 6700 AA Wageningen The Netherlands Laboratory of Phytopathology Wageningen University P.O. Box 16 6700 AA Wageningen The Netherlands Department of Bioorganic Chemistry Max Planck Institute for Chemical Ecology Hans-Knoll-Straβe 8 D-07745 Jena Germany

Insect herbivory can seriously hinder plant performance and reduce crop yield. Thrips are minute cell-content-feeding insects that are important vectors of viral plant pathogens, and are serious crop pests. We investigated the role of a sweet pepper (Capsicum annuum) lipoxygenase gene, calox2, in the defense of pepper plants against Western flower thrips (Frankliniella occidentalis). This was done through a combination of in-silico, transcrip-tional, behavioral andchemicalanalyses.Our datashowthat calox2 is involved in jasmonic acid (JA) biosynthesis and mediates plant resistance. Expression of the JA-related marker genes, calox2 and CaPIN II, was induced by thrips feeding. Silencing of calox2 in pepper plants through virus-induced gene silencing (VIGS) resulted in low levels of calox2 transcripts, as well as significant reduction in the accumulation of JA, and its derivatives, upon thrips feeding compared to control plants. calox2-silenced pepper plants exhibited enhanced susceptibility to thrips. This indicates that calox2 mediates JA-dependent signaling, resulting in defenseagainstthrips. Furthermore,exogenous application of JA to pepper plants increased plant resistance to thrips, constrained thrips population development and made plants less attractive to thrips. Thus, a multidisciplinary approach shows that an intact lipoxygenase pathway mediates various components of sweet pepper defense against F. occidentalis.

关键词： Western flower thrips sweet pepper calox2 jasmonate

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