Table I.

Comparison of the alkalinization response of cucumber seedlings to IAA and OGA pool in the presence and absence of added Ca²⁺

Treatment	ΔpH		Ratio
	+Ca2+	−Ca2+	Response ±
None	0.017 ±  0.008	0.044 ±  0.017	N.A.
0.05 μm IAA	0.14 ±  0.011	0.15 ±  0.01	0.93
1 μm IAA	0.25 ±  0.009	0.23 ±  0.01	1.1
15 μg mL−1 OGA pool	0.33 ±  0.02	0.15 ±  0.02	2.2
50 μg mL−1 OGA pool	0.56 ±  0.013	0.26 ±  0.03	2.2

Fifty 2-d-old seedlings were equilibrated in incubation medium containing either 0.5 mm (⁺Ca²⁺) or no added Ca²⁺ (−Ca²⁺). Nos. represent the mean ± se for three separate experiments. The ratio of the ⁺Ca²⁺ average response divided by the −Ca²⁺ average response is shown. N.A., Not applicable.