Figure 2.

Nitrogen source and MeaB regulate plant infection. Incidence of F. oxysporum wilt on tomato plants 20 days after inoculation with the indicated strains and supplied with solutions containing 25 mM of NaNO₃ (black columns) or NH₄NO₃ (grey columns). Severity of disease symptoms was recorded using an index ranging from 1 (healthy plant) to 5 (dead plant). Bars represent standard errors calculated from 10 plants.