الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 147 |  |  |
| | | from | 147 | | |
Abstract
A study was conducted under the full sun at Orman Botanical Garden, Hort. Res. Inst., Giza, Egypt during 2015 and 2016 seasons in order to examine the deleterious effects of lead (Pb), cadmium (Cd) and nickel (Ni) heavy metals when applied together in combinations as acetate salts to the soil mixture at the concentration of 0.00 for each metal as control, 500 ppm Pb + 50 ppm Cd + 25 ppm Ni for combination number one (T1) and 2- 3- and 4-fold of these concentrations for combinations number two (T2), three (T3) and four (T4), successively on survival, growth performance and chemical composition of one-year-old transplants of black elderberry (Sambucus nigra L.) and seedlings of khof EL-Gamal tree (Bauhinia purpurea L.) cultivated in 20 cm diameter black polyethylene bags filled with about 3 kg/bag of sand and clay mixture at equal parts by volume (1:1, v/v).
The obtained results indicated that no mortality was occurred among the elemental contaminated elderberry plants giving 100% survival as the control, while in butterfly ones, this percent was descendingly decreased with increasing heavy metal concentrations to become 50% only by T2 combination against 100% for control in the two seasons. However, a great reduction in the percent of survival was attained by T3 and T4 combinations that decreased the means of such trait to less than 35 and 20%, respectively. A similar response occurred as well with few exceptions in respect of means of vegetative and root growth characters of both plant species, which were gradually decreased as a result of the progressive increment in heavy metal concentrations, with significant differences compared to control means in most cases of both seasons. The inferiority in all previous characters in the two seasons was forT4 combined treatment, which followed by T3 one. The results also cleared that pollution resistance indices (PRI%) of the two studied plants were decreasingly declined with elevating metal concentrations. Hence, elderberry plants could tolerate the high levels of metals used in this study, while butterfly ones could not. The results also cleared that chlorophyll a, b, carotenoids, total soluble sugars, N and P% in the leaves of contaminated elderberry plants were gradually decreased in response to the gradual increase in metal concentrations. The opposite was the right regarding leaf content of K and contents of Pb, Cd and Ni in the leaves and roots, which were progressively increased, with few exceptions as the heavy metal concentrations were increased. A similar trend to that of chemical constituents in elderberry plant was also obtained in case of khof EL-Gamal tree one, except for K content in the leaves, that descendingly decreased with increasing heavy metal concentrations.