Table II.

As, total PC, and GSH concentrations in roots of H. lanatus clones of varying sensitivity exposed to their own As EC₅₀ concentration

Clone	As EC50 (μm)	As Root Conc	As Accumulation (Root/Solution)	Total PC	GSH	Ratio PC-SH/As	Ratio PC2:PC3:PC4
		μmol g−1 dry wt		μmol GSH equivalent g−1 dry wt	μmol g−1 dry wt
NM1	40	3.8 ± 0.3a	0.10	3.9 ± 0.7b	0.08 ± 0.01a	1.04	7:6:1
NM3	5	3.1 ± 0.4a	0.62	0.8 ± 0.1a	0.01 ± 0.001b	0.25	2:4:1
M2	800	8.7 ± 0.9b	0.01	15.4 ± 1.3c	0.16 ± 0.04a	1.77	12:6:1
M3	15	5.9 ± 0.4c	0.40	6.0 ± 0.5b	0.14 ± 0.03a	101	5:5:1

As accumulation from solution to root (As content of control root samples was < 0.003 μmol g⁻¹ dry wt). Data represent the mean ± se (n = 4).

^a  

^b  

^c Values followed by the same letter do not differ at P < 0.05.