Abstract:Strigolactone (SLs) as a new group of plant hormones, plays a variety of crucial functions in plant growth and development, including regulating plant branching, promoting seed germination, and affecting root system formation. MAX2 (more axillary growth 2) is a key regulator of SL signal transduction pathway. It is located downstream of the synthesis pathway genes MAX1, MAX3 and MAX4, and affects almost all phenotypes controlled by SLS. In recent years, the diversified functions of MAX2 have been gradually revealed. A large number of data show that MAX2 is not only an important component of SL signal, but also involved in the cross interaction between SL and a variety of hormone signals, which plays a vital role in all aspects of plant growth and development, as well as in the response to biotic and abiotic stresses. However, the specific regulation mechanism still needs to be further studied. The current known functions of MAX2 were summarized and elaborated, in order to provide theoretical reference for fully revealing the function of MAX2 and the cross- mechanism of regulating various hormone signals.