Increased chalcone synthase (CHS) expression is associated with dicamba resistance in Kochia scoparia

Pest Management Science
Dean J PettingaTodd A Gaines

Abstract

Resistance to the synthetic auxin herbicide dicamba is increasingly problematic in Kochia scoparia. The resistance mechanism in an inbred dicamba-resistant K. scoparia line (9425R) was investigated using physiological and transcriptomics (RNA-Seq) approaches. No differences were found in dicamba absorption or metabolism between 9425R and a dicamba-susceptible line, but 9425R was found to have significantly reduced dicamba translocation. Known auxin-responsive genes ACC synthase (ACS) and indole-3-acetic acid amino synthetase (GH3) were transcriptionally induced following dicamba treatment in dicamba-susceptible K. scoparia but not in 9425R. Chalcone synthase (CHS), the gene regulating synthesis of the flavonols quertecin and kaemperfol, was found to have twofold higher transcription in 9425R both without and 12 h after dicamba treatment. Increased CHS transcription co-segregated with dicamba resistance in a forward genetics screen using an F2 population. Prior work has shown that the flavonols quertecin and kaemperfol compete with auxin for intercellular movement and vascular loading via ATP-binding cassette subfamily B (ABCB) membrane transporters. The results of this study support a model in which constitutively increased CHS...Continue Reading

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Citations

Apr 25, 2018·Pest Management Science·William Edward Dyer
Sep 12, 2018·Pest Management Science·Todd A GainesFranck E Dayan
Mar 15, 2019·Pest Management Science·Carla Díaz-TielasStephen O Duke
Mar 14, 2018·Proceedings of the National Academy of Sciences of the United States of America·Sherry LeClereR Douglas Sammons
May 21, 2020·The Journal of Biological Chemistry·Todd A GainesFranck E Dayan
Sep 22, 2020·Pest Management Science·Junjun OuMithila Jugulam
Nov 30, 2019·Plant Science : an International Journal of Experimental Plant Biology·Valeria E PerottiHugo R Permingeat
Nov 13, 2020·Plant Science : an International Journal of Experimental Plant Biology·Olivia E ToddTodd A Gaines

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