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- W2285302167 abstract "Tryptophan-derived, indolic metabolites possess diverse functions in Arabidopsis innate immunity to microbial pathogen infection. Here, we investigate the functional role and regulatory characteristics of indolic metabolism in Arabidopsis systemic acquired resistance (SAR) triggered by the bacterial pathogen Pseudomonas syringae. Indolic metabolism is broadly activated in both P. syringae-inoculated and distant, non-inoculated leaves. At inoculation sites, camalexin, indol-3-ylmethylamine (I3A), and indole-3-carboxylic acid (ICA) are the major accumulating compounds. Camalexin accumulation is positively affected by MYB122, and the cytochrome P450 genes CYP81F1 and CYP81F2. Local I3A production, by contrast, occurs via indole glucosinolate breakdown by PEN2- dependent and independent pathways. Moreover, exogenous application of the defense hormone salicylic acid stimulates I3A generation at the expense of its precursor indol-3-ylmethylglucosinolate (I3M), and the SAR regulator pipecolic acid primes plants for enhanced P. syringae-induced activation of distinct branches of indolic metabolism. In uninfected systemic tissue, the metabolic response is more specific and associated with enhanced levels of the indolics I3A, ICA, and indole-3-carbaldehyde (ICC). Systemic indole accumulation fully depends on functional CYP79B2/3, PEN2, and MYB34/51/122, and requires functional SAR signaling. Genetic analyses suggest that systemically elevated indoles are dispensable for SAR and associated systemic increases of salicylic acid. However, soil-grown but not hydroponically -cultivated cyp79b2/3 and pen2 plants, both defective in indolic secondary metabolism, exhibit pre-induced immunity, which abrogates their intrinsic ability to induce SAR." @default.
- W2285302167 created "2016-06-24" @default.
- W2285302167 creator A5003950064 @default.
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- W2285302167 creator A5055531304 @default.
- W2285302167 creator A5088737224 @default.
- W2285302167 date "2016-05-01" @default.
- W2285302167 modified "2023-10-12" @default.
- W2285302167 title "Regulatory and Functional Aspects of Indolic Metabolism in Plant Systemic Acquired Resistance" @default.
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- W2285302167 doi "https://doi.org/10.1016/j.molp.2016.01.005" @default.
- W2285302167 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/26802249" @default.
- W2285302167 hasPublicationYear "2016" @default.