Volcano blots show significant changes in gene expression for soybean roots after infection with M. incognita. (a) Changes in gene expression at 12 dai (b) Changes in gene expression at 10 wai. The fold change was >1.5 with p values < 0.05, determined individually for each gene. The vertical lines on each graph represent p = 0.05. The horizontal lines represent the log2 of gene expression.