Table II.

Comparison of the alkalinization response of whole and dissected 2-d-old cucumber seedlings treated with 50 μg mL⁻¹ OGA pool or 1 μm IAA

	ΔpH
Treatment	Whole	Apical Root	Basal Root	Hypocotyl/ cotyledons
50 μg mL−1 OGA pool	0.49 ± 0.043	0.43 ± 0.041	0.69 ± 0.077	0.22 ± 0.022
1 μm IAA	0.18 ± 0.012	0.19 ± 0.042	0.057 ± 0.014	0

Seedlings with roots of approximately 2-cm length were dissected into three segments: the root apical 1 cm, the root basal 1 cm, and the remaining segment containing the hypocotyl and cotyledons. Fifty of each segment or whole seedlings were assayed individually in 10 mL of incubation medium. Nos. represent the mean ± se of the maximal pH change corrected for the pH change in the absence of treatment in three separate experiments.