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The function of TIR2 in IAA biosynthesis. A, Schematic diagram of the IPA pathway. B, Root elongation after treatment with 5-MT. C and D, Hypocotyl length in seedlings grown on IPA (C) and IAA (D). Seedlings were grown at 22°C for 3 d followed by 4 d in the absence or presence of compound at 29°C. The effect of IPA and IAA on hypocotyl length is expressed as a percentage increase compared to medium without compound.
