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Biocontrol activity of wild type, Δtvk24, and Δtvk133. (A) Disease index of the root systems from cotton plants infected with R. solani. (B) Percentage of healthy plants after P. ultimum treatment. Columns with a letter in common did not differ significantly according to Fisher's protected least significant difference test at a significance level of 5%. + and -, presence and absence of the pathogen, respectively.
