decrease

The phytohormone auxin is critical for plant growth and triggers many developmental processes [1]. Its effects on plant development are mediated by two distinct signaling pathways: the nuclear TIR1/AFB pathway and the ABP1 dependent pathway [2]. The nuclear TIR1/AFB pathway is well-characterized, controls a remarkable number of auxin mediated process, and plays an important role in plant development [3,4]. However, the ABP1 dependent pathway remains elusive until now. It has shown that ABP1 may be an important candidate for auxin receptor, and essential for a set of auxin responses, including early auxin response at the plasma membrane, cell division and expansion, and auxin regulated gene expression [5,6]. It is important throughout the life of plants, such as embryogenesis and postembryonic shoot and root development [7]. But there are still many unresolved problems concerning the molecular function of ABP1.Thus it still has attracted widespread attention of researchers