Abstract:

【Objective】The purpose was to study the effect of arbuscular mycorrhizal fungi on plant growth and endogenous in cucumber Rhizoctonia solani .【Method】 In pot culture, the plant with no inoculation as control, cucumber infected by GV was inoculated with Rhizoctonia solani and dynamic variation of IAA、GA3、Zeatin、ABA in cucumber roots in different treatments were decided by the method of ELIA.【Results】(1) The effect of GV and Rhizoctonia solani on endogenous in cucumber root was different. AMF inoculation improved the content of IAA、GA3、Zeatin、ABA. these endogenous hormones, whereas Rhizoctonia solani inoculation improved the content of IAA、ABA and decreased GA3、Zeatin at the same time. (2)Higher content of IAA、GA3、Zeatin in root inoculated with GV and lower ABA was detected compared to the control infected by Rhizoctonia solani.【Conclusion】GV improved plant growth and the improved disease tolerance was related to the content of IAA、GA3、Zeatin induced by GV. IAA has certain role in plant defense against pathogen infection process