Microbial fertilizer is the important input for sustaining the green development of agriculture,beneficial rhizobacteria are the main source of the functional strains of microbial fertilizer.Modem agricultural development needs novel functions of the microbial fertilizer,such as to promote the root growth and to enhance the plant's tolerant of salt stress,but our understanding of the mechanisms for these functions are still limited,which limited the screen-ing and breeding of the excellent strains for microbial fertilizer.On the other hand,the poor root colonization capabili-ty of the microbial fertilizer resulted its field application efficiency.This review summarized the active substances from the beneficial rhizobacteria and their regulation mechanisms to promote plant's root development and salt stress toler-ance,analyzed the process and rhizobacteria-plant interaction mechanism during the root colonization of microbial fer-tilizer,proposed the strategies to enhance their root colonization.This review provides instructions for the research of microbial fertilizer.
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