Fig. 2.

Peroxidase activity released into the medium of maize cell cultures after 11 h in the presence or absence of OAC. Cells from a 4-d-old maize culture were suspended in fresh medium at 96 mg f. wt mL⁻¹. OAC was added to three replicate cultures to 333 nm (closed symbols); control cultures received no OAC (open symbols). After 11 h, 20 µL of the spent medium was added to 2 mL of a peroxidase assay mixture and the increase in A₄₃₀ was recorded.