Among the most up-regulated genes at 24 h, Table 2 shows a pathogenesis-related protein, a lipase-hydrolase protein and various glutathione-S-transferases (GSTs), revealing a response of the root to microbe signals in line with responses already registered in plant root hairs upon early infection by symbiotic soil bacteria (Libault et al., 2010; Gourion et al., 2015). The gene discussed is HPGDS; the disease is infection.