Physiological studies on some populus species

The objective of this study was to evaluate the effect of using NAA and IBA at concentrations 500, 1000 and 1500 ppm on rooting and growth, also the effect of growing media and putrescine at the levels of, 50, 100 and 200 ppm in addition to control (distilled water) on vegetative growth and chemical constituents of Populus euramericana and Populus nigra during 2006 and 2007. The obtainted resultes summarized as follows. Effect of NAA and IBA on Populus euramericana stem cuttings: NAA at 500 ppm gave the highest values of rooting %, number of roots, root length, fresh and dry weight of roots, plant height, number of leaves, fresh and dry weight of leaves. Whereas, NAA at 1000 ppm gave the highest values of stem diameter, fresh and dry weight of stem . Effect of NAA and IBA on Populus nigra stem cuttings: IBA at 1000 ppm gave the best results of all parameters. Effect of growing media and Putrescine on Populus -euramericana plants: Growing the plants in mixture form sand+clay medium and spray with putrescine at 50 ppm gave the highest values of plant height, number of leaves, total leaf area, diameter of stem, length of root ,fresh and dry weight of leaves and stems, leaf concentration of chlorophyll a, b, also carbohydrate% in the stems and roots, N % in the leaves and stems, P% in the leaves, stems and roots and K% in leaves, stems and roots. While, mix. media and spray with putrescine at 100 ppm gave the highest values of diameter of root and fresh and dry weight of roots, carbohydrate % in the leaves, N% in the roots. Effect of growing media and Putrescine on Populus nigra plants: Growing the plants in clay soil and spray with putrescine at 100 ppm gave the highest values of all parameters, except, length of root and fresh and dry weight of roots were increased with clay soil and using 200 ppm putrescine. Also carbohydrate% in the roots, P% in the leaves and roots and K% in the stem were increased with clay soil and using 50 ppm putrescine.