Ecophysical and ultrastructural effects of copper in Thlaspi ochroleucum (Cruciferae)

摘要: The toxic effects of Cu on growth, element uptake, chlorophyll content, cellular ultrastructure, and morphometry a Zn-and Pb-tolerant ecotype Thlaspi ochroleucum have been investigated in hydroponic cultures. Increasing concentrations nutrient solutions caused reduction root decrease total content the leaves, an increased uptake Cu, decreased elements such as Ca, Mg, K, Fe. Gross anatomy intercellular spaces leaves plants treated with did not differ significantly from controls. However, cells contained fewer smaller chloroplasts that lacked starch grains number large plastoglobuli. volume fraction internal membrane system was reduced, but ultrastructurally it similar to control. These findings, combination reduced quantity chlorophyll, indicate existence well-organized does necessarily imply presence high am...