Abstract
Abstract This study is carried out the University of Mosul/ College of Education/ Department of Biology. It aims at indicating the effects of using the growth regulator Indole Acetic Acid (IAA) to decrease the harm of contamination with Nickel element in the soil in growing two types of Trigonella foenum – graecum L.. The study has showed that adding the heavy element (Ni) led to significant decrease in the growth due to decreasing in the dry weights of the shoot and root. The study has also showed a significant decrease in the relative water content, chlorophyll a, b, a+b in leaf, protein and carbohydrate, Furthermore a significant increase also noticed in the growth and physiological features of the above mentioned. As for interaction effects between growth regulator and Ni, The addition of growth regulator with an average 200 ppm to Ni contained soil at two concentrations 100, 300 Mg / Kg soil respectively has led to a significant increase in growth. Similarly it has led to eliminating some negative effects of physiological aspects. There was an increase of the plant (fenugreek) resistance to high concentrations of Ni compared with those plants grown in soils contain Ni only.
