Table I.

The effect of pretreatment for 55 min with DEPC, a protein modifying reagent, or 10 min of boiling in de-ionized water on Na⁺ influx into 12-d-old excised roots of Arabidopsis

Values represent mean ± se (n = 18 for controls, n = 6 for all other treatments). FM, Fresh mass. -, not measured.

Treatment	Na+ Influx
	0.05 mM Ca2+	0.2 mM Ca2+	3.0 mM Ca2+
	μmol g−1 FM min−1
Control	3.00 ± 0.26	1.88 ± 0.12	1.34 ± 0.19
0.05 mM DEPC	−	1.17 ± 0.20b	−
0.5 mM DEPC	0.75 ± 0.08a	0.82 ± 0.06b	0.66 ± 0.04c
Boiling	−	0.04 ± 0.04b	−

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