Presumably, accumulation of APX activity and formation of
H2O2 are favored flood resistance. These results suggest that
increased rates of H2O2 in the roots of flooded plants could
lead to an increased capacity of the scavenging system of
H2O2. In other words, APX is considered to be the primary
H2O2 scavenging enzyme in root cells of present materials.
APX may augment some antioxidants in the removal of
H2O2 from plant cells. High levels of superoxide disumutation
should be followed by the peroxidation of H2O2 catalyzed
by APX activity. Consequently, APX activity plays a
major role in maintaining the balance between free radical
production and elimination.