Use of Ananas Comosus as a Phytotoxicity Indicator on Lead (Pb) in Contaminated Soil
The Ananas comosus (Pineapple) was investigated as an indicator for phytotoxicity levels of lead (Pb) in contaminated soil. The Pb(II) toxicity to pineapple plants was assessed separately over 10 concentrations from 100–3,000 mg/kg of soil. ThePb(II) [Pb(NO3)2] phytotoxicity level to pineapples was found to be 2,500 mg/kg. Then, the effect of these concentrations of Pb(II)were examinedafter 30-180 d of treatment (exposure). The Pb was affected to the growth rate of plants after 150 and 180 d of cultivation. The average dry weight of the control and Pb-treatedplants after 180 d were 56.46 and 43.20 g, respectively, for the aboveground parts (stem and leaf), and 24.57 and 14.73, respectively, for the underground parts (root). Accumulation of Pb in the plants increased with time, but were higher in the underground than the aboveground parts and after 180 d reached Pb levels of6,177.00 mg/kg, in the underground parts, which represents anaccumulation of 23.7%, of the initial soil level of Pb, while Pb accumulation resulted in yellow leaves.
Keywords - Ananas Comosus (L.) Merr; Indicator; Phytotoxicity; Lead