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Department of Biochemistry & Molecular Biology

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These digital collections include theses, dissertations, and datasets from the Department of Biochemistry & Molecular Biology.

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Browsing Department of Biochemistry & Molecular Biology by Subject "2,4-D"

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    Dataset associated with “An in-frame deletion mutation in the degron tail of auxin co-receptor IAA2 confers resistance to the herbicide 2,4-D in Sisymbrium orientale”
    (Colorado State University. Libraries, 2021) de Figueiredo, Marcelo R. A.; Küpper, Anita; Malone, Jenna M.; Petrovic, Tijana; de Figueiredo, Ana Beatriz T. B.; Campagnola, Grace; Peersen, Olve B.; Prasad, Kasavajhala V.S.K.; Patterson, Eric L.; Reddy, Anireddy S. N.; Kubeš, Martin F.; Napier, Richard; Dayan, Franck E.; Preston, Christopher; Gaines, Todd A.
    The natural auxin indole-3-acetic acid (IAA) is a key regulator of many aspects of plant growth and development. Synthetic auxin herbicides such as 2,4-D mimic the effects of IAA by inducing strong auxinic signaling responses in plants. To determine the mechanism of 2,4-D resistance in a Sisymbrium orientale (Indian hedge mustard) weed population, we performed a transcriptome analysis of 2,4-D-resistant (R) and -susceptible (S) genotypes that revealed an in-frame 27-nucleotide deletion removing 9 amino acids in the degron tail (DT) of the auxin co-receptor Aux/IAA2 (SoIAA2). The deletion allele co-segregated with 2,4-D resistance in recombinant inbred lines. Further, this deletion was also detected in several 2,4-D resistant field populations of this species. Arabidopsis transgenic lines expressing the SoIAA2 mutant allele were resistant to 2,4-D and dicamba. The IAA2-DT deletion reduced binding to TIR1 in vitro with both natural and synthetic auxins, causing reduced association and increased dissociation rates. This novel mechanism of synthetic auxin herbicide resistance assigns a new in planta function to the DT region of this Aux/IAA co-receptor for its role in synthetic auxin binding kinetics and reveals a potential biotechnological approach to produce synthetic auxin resistant crops using gene editing.