Differential Uptake, Partitioning and Transfer of Cd and Zn in the Soil−Pea Plant−Aphid System

Abstract

The biomagnification of trace metals during transfer from contaminated soil to higher trophic levels may potentially result in the exposure of predatory arthropods to toxic concentrations of these elements. This study examined the transfer of Cd and Zn in a soil-plant-arthropod system grown in series of field plots that had received two annual applications of municipal biosolids with elevated levels of Cd and Zn. Results showed that biosolids amendmentsignificantly increased the concentration of Cd in the soil and the shoots of pea plants and the concentration of Zn in the soil, pea roots, shoots, and pods. In addition, the ratio of Cd to Zn concentration showed that Zn was preferentially transferred compared to Cd through all parts of the system. As a consequence, Zn was biomagnified by the system whereas Cd was biominimized. Cd and Zn are considered to exhibit similar behaviors in biological systems. However, the Cd/Zn ratios demonstrated that in this system, Cd is much less labile in the root-shoot-pod and shoot-aphid pathways than Zn.

Interactive and Single Effects of Ectomycorrhiza Formation and Bacillus cereus on Metallothionein MT1 Expression and Phytoextraction of Cd and Zn by Willows

“…None of the tested inocula caused a combined increase of the Cd and Zn uptake by willows. In agreement with our results, a preferable uptake of Zn compared to Cd was also observed in peas (Green and Tibbett 2008). Furthermore, in tomato, opposite changes in the Cd and Zn uptake were observed (Khan and Khan 1983), although these elements are supposed to behave similar in biological systems (Neibor and Richardson 1980).…”

Transfer of cadmium and lead from soil to mangoes in an uncontaminated area, Hainan Island, China

“…This might suggest a physiological mechanism for exclusion of Cd from seed generating organs. Such an exclusion mechanism of Cd has been reported for other plant species (Harris and Taylor, 2001;Green and Tibbett, 2008). The relationships based on liable concentrations showed that the correlations between liable soil Cd and Cd in Ji-Dan mango fruits and between liable soil Pb and Pb in Tai-Nong mango fruits were at statistical significant levels (Fig.…”

“…Method blanks in each batch of samples were negligible. The transfer factors (TFs) of Cd and Pb from soil to fruit (edible part) were calculated using the following equation (Chojnacka et al, 2005;Li et al, 2006;Wang et al, 2006;Green and Tibbett, 2008;Williams et al, 2009):…”

Health risk assessment of heavy metals in soil-plant system amended with biogas slurry in Taihu basin, China

“…As TF of Zn was less than 0.16, the transfer of Zn seemed to be somewhat inhibited from root to aerial parts in vegetables. This might be due to the antagonistic effect between Zn and Cd (Green and Tibbett 2008;Zheng et al 2007). The two elements possess similar chemical properties and may behave similarly in biological systems (Malik et al 2010).…”