PEO-IAA (2-(1H-Indol-3-yl)-4-oxo-4-phenyl-butyric acid) is a novel potent auxin antagonist that binds to transport inhibitor response 1/auxin signaling F-box proteins (TIR1/AFBs). PEO-IAA suppresses not only the expression of an auxin-responsive ZmSAUR2 gene, but also gravitropic curvature.
[1] Nishimura T, et al. Plant Cell Physiol. 2009 Nov;50(11):1874-85.
















