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Auxin plays a key role in lateral root formation, but the signaling pathway for this process is poorly understood. We show here that NAC1 , a new member of the  NAC  family, is induced by auxin and mediates auxin signaling to promote lateral root development. NAC1 is a transcription activator consisting of an N-terminal conserved NAC-domain that binds to DNA and a C-terminal activation domain. This factor activates the expression of two downstream auxin-responsive genes,  DBP  and  AIR3 . Transgenic plants expressing sense or antisense  NAC1  cDNA show an increase or reduction of lateral roots, respectively. Finally, TIR1-induced lateral root development is blocked by expression of antisense  NAC1  cDNA, and NAC1 overexpression can restore lateral root formation in the auxin-response mutant  tir1 , indicating that NAC1 acts downstream of TIR1.

ArabidopsisNAC1 transduces auxin signal downstream of TIR1 to promote lateral root development