Effects of O3 on SOD, POD, CAT and
H2O2
By comparison, SOD exhibited an increase of activity in wheat, rice and
soybean. We only observed significant altered activity of SOD in soybean
under O3 treatment (Fig.2A). Compared with CF treatment,
elevated [O3] inhibited activities of POD and CAT in
wheat and soybean, meanwhile, simulated the activity in rice. POD were
reduced in wheat and soybean, but increased by two fold in rice (Fig.
2B). There were no significant changes in activities of CAT in rice and
soybean, except wheat (Fig. 2C). Moreover, the concentration of
H2O2 in rice and soybean leaves was
strongly increased in response to O3-exposure (Fig. 2D).
However, there was no significant increase in
H2O2 concentration in wheat.