•Borage is commercially cultivated for gamma-linolenic acid (GLA, 18:3-6,9,2), a nutraceutical fatty acid used in food and cosmetics.•However, an herbicide-resistant variety for effective weed management has not yet been developed, which severely constrains the borage framing.•This manuscript reports generation of two borage mutant lines resistant to herbicide imidazolinone by ethyl methanesulfonate (EMS) mutagenesis.•Molecular analysis of the mutant lines revealed single nucleotide substitution inside two acetohydroxyacid synthase (AHAS) genes.•A KASP marker was thus developed to differentiate the homozygous susceptible, homozygous resistant and heterozygous borage plants.•An in vitro assay further showed that homozygous resistant borage carrying the AHAS1 mutation retained significantly higher AHAS activity than susceptible borage across different imazamox concentrations.
Plant Science – Elsevier
Published: Sep 1, 2017
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