Fig. 2

Principal component analysis (PCA) of the 35 BC1 individuals tested in 2010–2011 and 2011–2012 experiments with root system development (RD), root weight (RW), nematode reproduction factor (RF) and gall index (GI). The two major principal components that accounted for 94.25% of the variance have been plotted. The rating criteria factor map (left) and the individuals factor map (right) are reported. In the individual factor map, the BC1 individuals were assigned to two distinct groups, the resistant group in green and the susceptible group in pink, based on their RF and GI criteria