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Length (a), surface area (b), volume (c), number of tips (d), and average diameter (AvD) (e) of roots of rice plants inoculated with A. baldaniorum, E. coli DH10b, G. diazotrophicus lao- ( mutant deficient in the production of IAA) and G. diazotrophicus PAL 5 (IAA-producing wild strain). “Control” stands for the uninoculated treatment. T-test (*p < 0.05; **p < 0.01; ***p < 0.001;****p < 0.0001) for the means of effects between the control and different treatments, ns = not significant
