Effect of calcium ions on NADPH oxidase activity in embryoless half-seeds treated with distilled water, 1 μM GA, 1 μM GA + 5 or 10 mM EGTA, 1 μM GA + 5 or 10 mM LaCl3, or 1 μM GA + 50 mM calmidazolium for 24 h.

Bar with different letters differ significantly (P < 0.05, Tukey’s test, n = 5).