Relationship between tolerance and accumulation characteristics of cadmium in higher plants |
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| Authors: | T Kuboi A Noguchi J Yazaki |
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| Institution: | (1) National Institute for Environmental Studies, 305 Tsukuba, Ibaraki, Japan;(2) Faculty of Agriculture, Utsunomiya University, 321 Utsunomiya, Japan;(3) College of Agriculture and Veterinary Medicine, Nihon University, Shimouma, Setagaya-ku, 154 Tokyo, Japan |
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| Abstract: | Ten plant species belonging to 5 families,i.e., Cruciferae, Cucurbitaceae, Gramineae, Leguminosae, and Solanaceae, were grown in a sand soil at two pH levels. The soil
was subjected to an application of CdCl2 at rates of 0 to 700 mgCd·kg−1 soil. The relationship between Cd concentration in the shoots (tc) and soil (sc; NH4NO3 extractable) was expressed by the equation: log (tc)=α+βlog (sc). The coefficients α and β were estimated for each species at each level of soil pH. Plottings of the scores on α and β axes
showed that the Cd accumulation characteristics in the plants appeared to depend on the families irrespective of soil pH.
Based on theupper critical concentration of Cd in the tops (Ct), the Cruciferae and Leguminosae species were found to be the most and the least tolerant to Cd, respectively. The Ct values correlated exceedingly well with the values of α. |
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| Keywords: | accumulation Cd Cruciferae Cucurbitaceae Gramineae Leguminosae NH4NO3-extractable Cd sand soil soil pH Solanaceae Taxonomy tolerance |
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