Figure 4: The effect of blue LED light on the resistance of tomato to B. cinerea. (A) Development of brown lesion in 4-week-old tomato seedlings infected by B. cinerea. Tomato leaves were inoculated with B. cinerea spores and then kept under broad-spectrum-white LED (control) and blue LED lights for 10 days. (B) Incidence of disease (mean ± SD) was quantitatively assessed by the following indices: 0: no symptoms, 1: 1-12% lesion, 2: 13-25%, 3: 26-50%, and 4: 51- 100%. Error bars represents the standard deviation (n=3). Bars with the same low case letter are not significantly different (p>0.05), as assessed by Tukey’s honestly significant difference.