Table 2.

Effect of Al exposure on cell wall cation exchange capacity (CEC)

Treatment time (h)	Cell wall CEC (µmol g–1)
	0 µm Al	200 µm Al	1000 µm Al
0	15.6 (±2.1)	15.6 (±2.1)	15.6 (±2.1)
24	14.7 (±4.2)	34.6 (±4.6)	48.5 (±4.4)
48	14.1 (±1.1)	49.7 (±2.4)	62.1 (±3.6)
96	14.3 (±3.6)	57.6 (±6.3)	77.4 (±5.8)

The La sorption by the apical signal grass root tissues was analysed after 0, 24, 48 and 96 h.