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. 2017 Jun 19;8:1006. doi: 10.3389/fpls.2017.01006

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Copyright © 2017 Kuhn, Lorek, Kwaaitaal, Consonni, Becker, Micali, Ver Loren van Themaat, Bednarek, Raaymakers, Appiano, Bai, Meldau, Baum, Conrath, Feussner and Panstruga.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Transcripts of biosynthetic genes of the Trp/indole glucosinolate and camalexin pathways accumulate in mlo2 mlo6 mlo12. Scheme of Trp, camalexin, indole-3-carboxylic acid (ICA) and indole glucosinolate biosynthesis/metabolism. Proteins with increased (red) or unaltered (blue) transcript accumulation in mlo2 mlo6 mlo12 vs. wild type following G. orontii challenge are indicated. Formulae of subsequently analyzed substances (bold) are shown. Trp is synthesized from chorismate and subsequently hydrolyzed to indole-3-acetaldoxime (IAOx) by the cytochrome P450 monooxygenases CYP79B2 and CYP79B3. IAOx is either converted to camalexin, ICA, auxin or indolic glucosinolates. PEN2 is an atypical myrosinase that hydrolyzes 4MI3G for antifungal defense. MYB51 regulates expression of several key enzymes of indole glucosinolate biosynthesis.