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PGP traits of bacterial isolates. (a) IAA production, (b) ACC deaminase activity, (c) siderophore production. The data were expressed as means ± standard deviation (n = 3). Different letters represent significant differences between groups at the 5% level (ANOVA and Tukey’s test). IAA: indole−3−acetic acid, ACC: 1−aminocyclopropane−1−carboxylic acid.
