The effect of arsenate and arsenite on some growth parameters of Isatis cappadocica

Arsenic is non-essential and toxic metalloid for plants and one of the environmental pollutants that has two arsenate and arsenite species in the environment. Isatis cappadocia,is an arsenic hyperaccumulator that grows in arsenic contaminated areas in Iran. This plant is a good option for arsenic phytoremediation in these areas. In this study, for the first time, the effects of two arsenate and arsenite species on growth parameters of this plant were investigated. For this purpose, under hydroponic conditions, four leaf seedlings were treated with different concentrations of 0, 5, 25, 125 and 625 μM arsenate and arsenite. After 14 days and finishing the treatment period, the samples were taken and the growth parameters including root length, shoot length, root and shoot weights were measured. The results of arsenate and arsenite treatments on growth parameters showed that higher levels of both types of arsenic resulted in decreased growth parameters and the effect of this growth decline, was observed especially in the plant biomass. The decreasing of these parameters was significant for arsenite treatments, while for plants under arsenate treatments it was not significant at most levels, that indicates the high resistance of I. cappadocica to arsenate. In general, the results of this study showed that in spite of high plant resistance to both types of arsenic in different treatments, 650 μM treatment had a toxic effect on plant growth, which was more pronounced in arsenite treatments and caused the plant to die

کلیدواژه ها:

Phytoremediation ، Arsenate ، Arsenite ، Isatis capadocica