Fig. 3

Effects of Si application on stress-related parameters. a Malondialdehyde (MDA) content and (b) In situ O2−, c Peroxidase (POD), d Polyphenol oxidase (PPO), e ascorbate peroxidase (APX) and (f) catalase (CAT). Each data point presents the mean of three replicates. Means denoted by different letters are significantly different (P < 0.05)