Figure 6
IN activity following prolonged exposures to “environmental” UV radiation (UV-A + UV-B) (right panel) and to UV-C (254 nm) radiation (left panel). For the “environmental” UV, when compared to non-irradiated controls (“0 min”), the concentration of cumulative ice nuclei (IN) per cell at −5 °C of P. syringae pv. syringae 281 exposed for two hours suffered no significant change, while P. syringae pv. garcae 158 samples exhibited an up to 10-fold reduction. The IN of P. syringae pv. syringae 281 exposed to 10,000 J/m2 of UV-C remained stable when compared to non-irradiated controls (“0 J/m2”). P. syringae pv. garcae 158, instead, was reduced by about 20-fold. Error bars denote standard deviations of the means (n = 7 for 281 and n = 5 for 158 for the “environmental” UV experiments, n = 6 for 281 and n = 7 for 158 for the UV-C experiments). Based on the Mann-Whitney U test, significantly different values are marked as *(p < 0.05) and non-significant differences as “ns”.
