Lantana camara L. is an invasive weed that spreads rapidly owing to its quick growth and easy distribution of seeds. Chromium, a common heavy metal contaminant, shows stunted plant growth, reduces root length and causes anatomical changes. Interestingly, L. camara can develop tolerance to chromium over time, making it potentially useful for phytoremediation. In this study, experiments are performed by growing it in soils containing different concentrations of Chromium Nitrate over varying times to monitor the trend of changes brought about in the secondary metabolite contents of the plant. This content was measured by performing the respective assays to quantify them. The study showed the undoubted potential of the plant to survive even at concentrations as high as 75 µM. The plant sample that was treated with 25 μM showed an initial increases in 3 days. This value increased and reached a peak in 7 days. The content further decreased in 14 days. Through these defence mechanisms, it has elevated the levels of available plant secondary metabolites.
Jhawar et al. (Wed,) studied this question.