Fig. 8.

Activity of the antioxidant enzyme peroxidase (POX) in wild-type (WT) and transgenic OsUGT90A1-overexpression (OX) Arabidopsis and rice lines. (a) POX activity in Arabidopsis WT Col-0 and in four OsUGT90A1-OX lines at warm temperatures (control; 28/25 °C day/night, 12-h photoperiod) or after freezing stress at –2 °C for 1.5 h. (b) POX activity in rice WT Kasalath (Kasa) and in two OsUGT90A1-OX lines under control conditions or after chilling stress at 10 °C for two days. Ind- and Jap- indicate that the indica or japonica allele of OsUGT90A1 was overexpressed, respectively. Data are means (±SD) of n=3 assays. Significant differences between the WT and transgenic plants were determined using two-tailed Student’s t-tests: *P<0.05; **P<0.01; ***P<0.001.