Fig. 13From: Protocatechuic acid, ferulic acid and relevant defense enzymes correlate closely with walnut resistance to Xanthomonas arboricola pv. juglandisFerulic acid content in the control (CK) and inoculated walnut fruits (Xaj) during 0–16 days. The blank histogram indicates that the content is too weak to detect. And the values are expressed as the mean ± standard deviation of three biological replicates. Letters indicated significant differences at a level of p < 0.05Back to article page