Tolerance to Cadmium of Agave lechuguilla (Agavaceae) Seeds and Seedlings from Sites Contaminated with Heavy Metals

Table 1

Metals in soils, at pH 5, and in Agave lechuguilla seeds from a contaminated site (Villa de la Paz, SLP) and from a noncontaminated site (Villa de Zaragoza, S.L.P.).

Elements	Villa de Zaragoza (mg/kg) in soil	Villa de la Paz (mg/kg)* in soil	Villa de Zaragoza (mg/kg) in seeds	Villa de la Paz (mg/kg) in seeds	Detection limit of each element (mg/L)
Al	ND	ND	0.1696	6.833	0.045
As	ND	939	ND	ND	0.02
Cd	ND	16	ND	2.982	0.0034
Cu	0.0149	440	3.36	6.574	0.0054
Pb	ND	518	ND	ND	0.042
Si	ND	ND	ND	7.866	0.026
Sr	ND	ND	ND	1.356	0.0077
Zn	20.293	763	5.633	10.533	0.0018

ND: nondetected. Asterisks * indicate values reported by Razo et al. (2004) [15].