FIGURE 4.

Influence of temperature on bacterial wilt symptomatology in S. dulcamara and susceptible tomato and potato varieties. (A) Bacterial wilt symptom development (0 = asymptomatic to 4 = completely wilted) after soil-drench inoculation in S. dulcamara, tomato cv. Marmande and potato cv. Desirée plants inoculated with the R. solanacearum luminescent reporter and kept at 20°C. n = 30–35 plants per species. (B) Bacterial concentrations at the taproot level quantified by measuring the luminescence at 10, 20 and 28 dpi from S. dulcamara, susceptible tomato cv. Marmande, and susceptible potato cv. Desirée inoculated as in panel (A). Results are grouped according to disease symptoms: asymptomatic (grey, disease index 0) and symptomatic (white, disease indices 1–4). n = 4–8 plants per sampling day and condition. ^∗indicates statistical differences (p value < 0.05, T-student significant test).