Table III.

The effect of various biochemical modulators of cation channels on Na⁺ influx into 12-d-old excised roots of Arabidopsis

Values represent mean ± se (n = 18 for the general control, n = 10 for the glutamate control and 2 mm glutamate treatment, n = 6 for all other treatments). FM, Fresh mass.

Treatment	Na+ Influx	Percentage Change Relative to Controla
	μmol g−1 FM min−1
Control (0.2 mM Ca2+)	1.88 ± 0.12
10 mM H2O2 (10 min)	2.34 ± 0.07	+25
10 mM H2O2 (50 min)	1.45 ± 0.08	−23
40 mM H2O2 (10 min)	0.98 ± 0.03	−48
0.5 mM 8-Br-c-AMP	1.51 ± 0.15
0.5 mM 8-Br-c-GMP	1.34 ± 0.15	−29
1 mM BABA	2.19 ± 0.32
10 mM BABA	1.56 ± 0.33
1 mM GABA	2.16 ± 0.20
10 mM GABA	2.66 ± 0.19	+42
Control (for glutamate)	1.78 ± 0.19
2 mM Sodium glutamate	2.23 ± 0.24	+25
10 mM Sodium glutamate	2.08 ± 0.19

^a When statistically significantly different to the respective controls, P < 0.05.