Table I.

The effect of the addition of allopurinol and DPI on ROS production and the HR

Treatment	HO2./O2−	Cell Viability
	10−9 mol 0.1 g−1 cells	%
Control
Nil	–	87.1 ± 0.7
20 μm DPI	–	82.2 ± 3.2
500 μm allopurinol	–	83.9 ± 0.7
500 μm allopurinol + 20 μm DPI	–	82.4 ± 0.7
Incompatible interaction
Nil	68.7 ± 10.9	38.6 ± 0.8
20 μm DPI	7.78 ± 1.6	48.7 ± 1
500 μm allopurinol	24.07 ± 6.8	45.7 ± 2.6
500 μm allopurinol + 20 μm DPI	6.67 ± 1.5	48.8 ± 0.7

Five-hundred micromolar allopurinol and 20 μm DPI were added at the time of Pn 4974 zoospore (incompatible) or water (control) addition to NC cells. Data represent means ± se of n = 8 from two experiments.