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Responses of phytohormone and lignin contents and related enzyme activities of maize roots to E. pisciphila inoculation and Cd stress. A: abscisic acid, B: Indole-3-acetic acid, C: Lignin; D: 4-coumarate CoA ligase, E: Cinnamyl-alcohol dehydrogenase, F: Peroxidase. Data were mean values (n = 3) and error bars represent the standard deviation. Different letters indicate significant differences between treatments.
