Table II. Quantities (nmol As g⁻¹ FW) of unbound inorganic As and As(III)-PC complexes in wild-type Arabidopsis and cad1-3 and cad2-1 mutants.

Plants were exposed to 10 μm As(V) for 3 d. Data are means ± se (n = 3).

Sample	Unbound	As(III)-GS/As(III)-PC Complexes					Total As	Percentage		Shoot-to-Root As Concentration Ratio
	Inorganic As	As(III)-(GS)3	As(III)-PC3	As(III)-(PC2)2	U1a	As(III)-PC4		Unbound	Bound
Wild-type shoots	2 ± 0.01						2	100	0	0.007
Wild-type roots	97 ± 2		60 ± 0.16	23 ± 2	14 ± 2	121 ± 3	316	30.8	69.2
cad1-3 shoots	20 ± 0.36		0.6 ± 0.28			2 ± 1	23	86.8	13.2	0.070
cad1-3 roots	303 ± 3	27 ± 1					330	91.9	8.1
cad2-1 shoots	5 ± 0.13	0.1 ± 0.04	0.2 ± 0.01			0.5 ± 0.06	6	87.4	12.6	0.038
cad2-1 roots	115 ± 1		16 ± 1	10 ± 0.24	3 ± 1	10 ± 4	153	75.4	24.6

^aAn unidentified species eluting around 20.9 min (U1), between the As(III)-(PC₂)₂ and As(III)-PC₄ complexes, was also quantified. This As species is included as bound As.