Figure 7. Responses of the wild-type and transgenic plants to H₂O₂ treatment.

(A) Phenotypes of wild-type, W69 and W106 seedlings under H₂O₂ treatment. Three-day-old seedlings of four transgenic lines and wild-type Arabidopsis were planted on MS media with added H₂O₂ (1 mM) for 15 d after germination. (B) Effect of exogenous H₂O₂ on biomass production and root development of wild-type, W69 and W106 seedlings. After growing in MS media with added H₂O₂ (1 mM) for 15 d after germination, seedlings were collected and analysed. Data are given for the length of the primary root, lateral root number, total lateral root length, seedling fresh weight and dry weight. Data are means ±SD of three independent experiments. Asterisks indicate a significant difference (*P<0.05; Student's t-test) relative to wild-type control.