Transcription factor that acts as negative regulator of lateral root (LR) development. Required for normal auxin responses during LR development. May be part of a negative feedback loop stimulated specifically in the endodermis upon LR initiation to ensure that LRs are formed only in the correct place. Interacts with FBX5. Specifically and transiently expressed in root endodermal cells overlying the early stages of lateral root primordia formation. Induced by abscisic acid (ABA), auxin and gravity in roots. High lateral root developmental progression and enhanced lateral root density.