Effects of lead toxicity on foliar anatomy in Hypericum perforatum L.

Lead is one of the hazardous heavy metals environmental pollutants. According to the environmental protection agency (EPA)، Pb is the most common heavy metal contaminant in the environment. The current study was undertaken to determine the effects of Pb toxicity in leaves of Hypericum perforatum L. Plants divided to 2 groups that first group treated by contaminant soils with 75، 150، 300، 600، 800، 1000، 1500 mgkg Pb in soil and second group treated by foliar spray with 0. 724، 1. 44 and 2. 9 mM Pb. This experiment was conducted under greenhouse condition. Results indicated that most of structural changes in soil pollution have been happened in epiderm، mesophyll، collanchyma and vascular bundles tissues. In foliar spray also epiderm، mesophyll، collanchyma and vascular bundles and secretory cavities have been changed.