Fig. 2From: Protocatechuic acid, ferulic acid and relevant defense enzymes correlate closely with walnut resistance to Xanthomonas arboricola pv. juglandisInfection incidence of four cultivars at 16 day post infection (dpi). 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