The effect of manganese on growth and some physiological and biochemical parameters of Lepidium sativum L

Manganese (Mn) is one of the essential micronutrients for all plants but its toxicity induced unfavourable symptoms in plants. In acid soils, manganese toxicity is often more common than its deficiency. In this study, because of the importance of Lepidium Sativum in many cases such as medicinal, nutriental and economic aspects, the effect of different concentrations of Mn (0, 250, 500 and 800 µM) on some of the growth factors and biochemical characteristics were studied. The results showed that the concentrations of 500 and 800 µM of Mn reduced length of shoot, root, absorption of Zn and catalytic activity but increased Malondialdehyde content in comparison with the control. In addition, the plants that treated with 250, 500 and 800 µM of Mn had no significant effect on carotenoid content while at the same time, increased antocyanin content.