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• W3021163402 abstract "Abstract Many plants produce structurally related defensive metabolites with the same target sites in insect herbivores. Two possible drivers of this chemical diversity are: (i) interacting effects of structurally related compounds increase resistance against individual herbivores, and (ii) variants of the same chemical structures differentially affect diverse herbivore species or feeding guilds. Erysimum cheiranthoides L (Brassicaceae; wormseed wallflower) produces abundant and diverse cardenolide toxins, which are derived from digitoxigenin, cannogenol, and strophanthidin, all of which inhibit Na + /K + -ATPases in animal cells. Here we describe an E. cheiranthoides mutant with 66% lower cardenolide content, resulting from greatly decreased cannogenol- and strophanthidin-derived cardenolides, partially compensated for by increases in digitoxigenin-derived cardenolides. This compositional change created a more even cardenolide distribution, decreased the average cardenolide polarity, but did not impact glucosinolates, a different class of chemical defenses. Growth of generalist herbivores from two feeding guilds, Myzus persicae Sulzer (Hemiptera: Aphididae; green peach aphid) and Trichoplusia ni Hübner (Lepidoptera: Noctuidae; cabbage looper), was decreased on the mutant line compared to wildtype. Both herbivores accumulated cardenolides in proportion to plant content, with T. ni accumulating higher total concentrations than M. persicae. Helveticoside, an abundant cardenolide in E. cheiranthoides , was absent in M. persicae , suggesting that this compound is not present in the phloem. Our results support the hypothesis that cardenolide diversity protects plants against different herbivores, with digitoxigenin-derived compounds providing better protection against insects like M. persicae and T. ni , whereas cannogenol and strophanthidin provide better protection against other herbivores of E. cheiranthoides. Funding This research was funded by US National Science Foundation awards 1907491 to AAA and 1645256 to GJ and AAA, Swiss National Science Foundation grant PZ00P3-161472 to TZ, and a Triad Foundation grant to GJ." @default.
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• W3021163402 date "2020-05-03" @default.
• W3021163402 modified "2023-09-25" @default.
• W3021163402 title "Less Is More: A Mutation in the Chemical Defense Pathway of Erysimum cheiranthoides (Brassicaceae) Reduces Total Cardenolide Abundance but Increases Resistance to Insect Herbivores" @default.
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• W3021163402 doi "https://doi.org/10.1101/2020.05.01.072850" @default.
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