The effects of AM fungi and phosphorus on the growth and physiology of Toona ciliata var.pu-bescens seedlings were studied.Using two-factor pot experiment,the seedlings were divided into inoculat-ed(AMF)and non-inoculated(Non-AMF)groups,and treated with different phosphorus concentrations(P0:0 mmol·L-1,P1:1 mmol·L-1,P2:2 mmol·L-1),respectively.The root infection rate,seedling growth,bio-mass,nutrients,chlorophyll fluorescence parameters,soluble proteins,and antioxidant enzymes were measured.The root mycorrhizal infection rate showed that AMF×P1 was higher than AMF×P0 and AM-F×P2,and 220 d seedlings(growth stage Ⅱ)was higher than 120 d seedlings(growth stage Ⅰ).In growth stage Ⅰ,compared to Non-AMF,AMF×P1 and AMF×P2 promoted the plant height,diameter,number of compound leaves,total root length,root surface area,and phosphorus and potassium uptake of seedlings,while AMF×P0 showed no significant change.In growth stage Ⅱ,the growth indicators,biomass,and nitro-gen,phosphorus,and potassium absorption capacity of Non-AMF×P2 were similar to those of AMF×P1 and AMF×P2.Compared to the Non-AMF,inoculation with AM fungi significantly enhanced Fv/F0 and Fv/Fm in the growth stage Ⅰ seedlings,while seedlings of Non-AMF×P0 had the highest F0,and the lowest Fv/F0 and Fv/Fm.In summary,a certain concentration of phosphorus combined with AMF can compensate for the growth inhibition caused by phosphorus deficiency,and the interaction between AMF and phosphorus shows a pro-moting effect on seedling growth earlier than simply applying higher concentrations of phosphorus.
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