Many genes associated with the metabolism of glutamate (Glu), which plays a central role in N metabolism through the glutamine (Gln) synthetase/Glu synthase cycle (GS/GOGAT cycle)26, showed different expression profiles in the two grapevine genotypes upon infection by B. cinerea (Fig. 4b and Supplemental Table 4). The gene discussed is GLUL; the disease is infection.