فهرست نشریات علمی دسترسی آزاد ایران

Heavy metal pollution in air and agricultural soils is one of the most important ecological problems in the whole world. According to the environmental protection agency (EPA), Pb is the most common heavy metal contaminant in the environment. M.chamomilla is one of the most important and the most frequently cultivated medicinal herbs. In this study, effects of Pb toxicity on M. chamomilla in the first stage of development and also in shooting and flowering stages were investigated. In doing so, seeds of M. chamomilla were grown in greenhouse, then plants in first stage of development were transplanted to hydroponic culture design five treatments of 0, 60, 120, 180, 240 µM Pb. No morphological change was observed during the treatment process in the different stages, but in all different stages reduction of total biomass was observed, compared to the control plants. The results indicated Pb accumulation in roots and aerial parts and an increasing trend with increasing Pb supply up to 180 µM. The results also showed that Pb concentration was higher in root than aerial parts especially in the first stage of development. Indeed, the results confirmed that chamomile had the ability to accumulate Pb in the roots so that preferential Pb accumulation prevented Pb toxicity symptom.