Figure 2.

Relative expression of the PRR genes of Vitis amurensis ‘Shuanghong’ after inoculation with Plasmopara viticola “ZJ-1-1” (black bars) and P. viticola “JL-7-2” (gray bars). Values on the vertical axes indicate the fold-change in gene expression, normalized to the expression level of Vitis EF1-α, SAND, and UBQ. The x-axes represent the time since inoculation. Error bars represent the standard deviation calculated from three replicates. * indicates significant differences (p < 0.05) as determined with Student’s t-test. Significant differences were identified by comparing the two gene expression levels at each time point.