Mutations in the <i>AXR3</i> gene of <i>Arabidopsis</i> result in altered auxin response including ectopic expression from the <i>SAUR‐AC1</i> promoter

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<jats:p>A new auxin response gene in <jats:italic>Arabidopsis</jats:italic> called <jats:italic>AXR3</jats:italic> has been identified. This gene is defined by two semi‐dominant mutations which affect many auxin‐regulated developmental processes. Auxin has been shown to maintain apical dominance, inhibit root elongation, stimulate adventitious rooting, mediate root gravitropism, and stimulate transcription from the <jats:italic>SAUR‐AC1</jats:italic> promoter. Mutant <jats:italic>axr3</jats:italic> plants show enhanced apical dominance, reduced root elongation, increased adventitious rooting, no root gravitropism, and ectopic expression from the <jats:italic>SAUR‐AC1</jats:italic> promoter. These phenotypes suggest an increased auxin response in the mutants. In support of this hypothesis, many of the phenotypes are partially restored to wild‐type by exogenous cytokinin, a treament that could restore a more wild‐type auxin to cytokinin ratio.</jats:p>

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