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Determination of auxin levels in root galls of Ler, and transparent testa 4 (tt4) and transparent testa 5 (tt5) mutants. Auxin levels were higher in control roots of tt4 and tt5 mutants relative to Ler, but were not elevated in root galls. Under these conditions, no differences in root and shoot indices were found, indicating no tolerance to the clubroot pathogen. Different letters indicate significant differences between samples at the P ≤ 0.05 level. IAA, indole‐3‐acetic acid.
