Figure 5.

Effects of pretreatment and post-treatment of allantoin (AT) on allantoate contents (A), endogenous AT content (B), nitric oxide (NO) content (C), nitrate reductase (NR) activity (D), hydrogen sulfide (H₂S) content (E), organic acid content (F), and glutathione S-transferase (GST) activity (G) in tomato plants grown 15 days in presence and absence of UVC stress. Each boxplot shows values of five independent replicates (n = 5). Boxplots specified with the same letter(s) are statistically non-significant at p < 0.05 based on Tukey’s test. Treatments are the same as Figure 1.