Shoot water content
(SWC)was calculatedbysubtraction.Thenutrient (Ca,K,Mg and
P) and heavy metal (Cd, Zn, and Pb) contents of the plant were
analyzed by ICP-AES after grinding and digesting the dried
biomass in a tri-acid mixture (HClO4, HNO3 and HF) [28]. The
bioconcentration factor (BCF) was calculated as the ratio between
the heavymetal concentration in the plant shoot and the
total heavy metal concentration in the soil [31].