Table I.

Effect of 1 mm PCMBS, 10 μm CCCP, and 100 mm KCl on 0.1 mm 2,4D-Lys, 0.1 mm lysine, and 0.1 mm 2,4D uptake by broad bean leaf discs

Treatment	2,4D-Lys		Lys		2,4D
	nmol cm−2 h−1	%	nmol cm−2 h−1	%	nmol cm−2 h−1	%
Control	1.43 ± 0.05	100.0	0.64 ± 0.02	100.0	6.35 ± 0.28	100.0
PCMBS	1.11 ± 0.03***	77.6	0.43 ± 0.01***	67.2	5.49 ± 0.22*	86.4
CCCP	1.17 ± 0.02***	81.8	0.42 ± 0.01***	65.6	4.10 ± 0.21***	64.6
KCI	1.30 ± 0.03 (NS)	90.9	0.39 ± 0.01***	61.0	7.84 ± 0.39*	123.5

Means ± se, n = 24. NS, Not significant. Asterisk indicates 0.05 > P > 0.01; triple asterisks indicate P < 0.001.