Fig. 4. Activities of the enzymes (a) polyphenol oxidase, and (b) peroxidases in shoots and roots of E. globulus plants inoculated with Streptomyces sp. PM9. Distilled water was used
as control. Analyses were carried out at 1, 3, 9 and 15 dpi. Bars represent standard error of the mean. Asterisks indicate difference between treatments at P 0.05 by Student T-test.