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- W2106121566 abstract "Induction of systemic defences to fungal pathogens is well described in model plant systems, but not extensively studied in large woody perennials. Systemic induced defences in long‐lived tree species, such as Eucalyptus grandis , could provide resistance against subsequent biotic challenges. Terpenoids are a class of plant‐specialized metabolites implicated in defence against herbivores and pathogens. The aim of this study was to characterize the systemic induction of terpenoids in E. grandis clones challenged with the fungal pathogen Chrysoporthe austroafricana . Ramets of E. grandis clones previously classified as moderately resistant ( TAG 5) and susceptible ( ZG 14) were inoculated with C. austroafricana on the main stem, with mock‐inoculated ramets to serve as controls. Leaf tissue was harvested 3 days post‐inoculation and terpenoid levels were measured using gas chromatography coupled with mass spectrometry. Foliar mRNA abundance profiles of four candidate terpenoid biosynthesis pathway genes were compared in inoculated and mock‐inoculated ramets of each genotype. Monoterpene levels differed between clonal genotypes and p ‐cymene was induced systemically in TAG 5. Expression profiling of geranyl pyrophosphate synthase ( EgrGPPS ), farnesyl pyrophosphate synthase ( EgrFPPS2 ), myrcene synthase ( EgrTPS084 ) and β ‐caryophyllene synthase ( EgrTPS038 ) show induction of transcripts involved in terpenoid biosynthesis in leaves following pathogen challenge on the main stem. Together these results suggest that resistant and susceptible Eucalyptus genotypes may have different constitutive and induced terpenoid profiles. The significance of the systemic induction of terpenoid levels in TAG 5 and terpenoid biosynthesis transcripts in both genotypes in response to C. austroafricana challenge in the stem, and their role in defence against secondary biotic attack, remains to be determined." @default.
- W2106121566 created "2016-06-24" @default.
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- W2106121566 date "2015-03-14" @default.
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- W2106121566 title "Foliar terpenoid levels and corresponding gene expression are systemically and differentially induced inEucalyptus grandisclonal genotypes in response toChrysoporthe austroafricanachallenge" @default.
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- W2106121566 doi "https://doi.org/10.1111/ppa.12368" @default.
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