ETT and IND protein interact in an IAA-sensitive manner. (A–D) BiFC with pYFPN-ETT and pYFPC-IND in the absence (A) and presence of IAA (B), NAA (C), and 2,4-D (D). All hormonal treatments were with 1 mM in lanolin. (E) Fluorescence quantification (CTCF) of split YFP signal between ETT and IND without treatment and with IAA, NAA, and 2,4-D. (*) P < 0.01; (***) P < 0.0001. Error bars show the standard deviation. (F) Y2H assays with increasing concentration of IAA, NAA, and 2,4D. Bars: A–D, 50 μm.