The plant cuttings is one of the most common methods of vegetative reproduction which is, today, used extensively due to low cost. In order to study the effect of various concentrations of Naphthalene acetic acid (NAA) and Indole acetic acid (IAA) on the rooting of semihardwood cuttings of Dalbergia sissoo , an experiment was carried out in a private field in Koya city in 2014. In this research, the treatments were prepared to include hormone of Naphthalene acetic acid in four levels of: (0, 100, 300 and 500 ppm) and Indole acetic acid in four levels of: (0, 100, 300 and 500 ppm), and the bottom part of the cutting was dipped into above solutions for 30 seconds. The results showed that the maximum percentage of the shooted cuttings, shoot length, number of main branch, diameter of main branch, leaf area, number & length of root, dry weight & biomass &dry matter of shoot, fresh &dry weight of root, biomass &dry matter of root and chlorophyll a belonged to IAA treatment with concentration of 500 ppm, NAA treatment with concentration of 500 ppm. Nitrogen and protein increased with concentration 300 ppm for IAA amd NAA auxins. The highest length of root belonged to IAA treatment with concentration of 500 ppm. All growth parameters were increased up to the highest concentrations of IAA 500 ppm. IAA was the most effective in promoting growth of Dalbergia sissoo cuttings.

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This study investigates the effects of soil contamination by nickel and lead on some enzymatic and non-enzymatic antioxidants in addition to the nitrate reductase (NR) enzyme activity for Gleditsia triacanthos, Leucaena leucocephala, and Robinia pseudoacacia plant species. The results of this study show a significant increase in peroxidase enzyme activity and a significant decrease in catalase enzyme activity, proline, total carotenoids, and total carbohydrate content of leaves of the three species with increasing the concentration of Ni and Pb except for the total carbohydrate, which increased only for L. leucocephala species. Each NR enzyme activity and ascorbic acid content are increased significantly with increasing the concentration of Ni and Pb for G. triacanthos, L. leucocephala, and on the contrary, they decreased significantly for R. pseudoacacia species. From the result, we can conclude a general increase or decrease in leaves content of some antioxidants content for all the species, whereas there is some peculiarity according to the plant species regarding other contents, which in turn reflects different mechanisms of these species to tolerant heavy metal stress

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