Vehicular emissions cause heavy metal pollution and exert negative impacts on environment and roadside vegetation. Wild plants growing along roadsides are capable of absorbing considerable amounts of heavy metals; thus, could be helpful in reducing heavy metal pollution. Therefore, current study inferred heavy metal absorbance capacity of some wild plant species growing along roadside. Four different wild plant species, i.e., Acacia nilotica L., Calotropis procera L., Ricinus communis L., and Ziziphus mauritiana L. were selected for the study. Leaf samples of these species were collected from four different sites, i.e., Control, New Lahore, Nawababad and Fatehabad. Leaf samples were analyzed to determine Pb2+, Zn2+, Ni2+, Mn2+ and Fe3+ accumulation. The A. nilotica, Z. mauritiana and C. procera accumulated significant amount of Pb at New Lahore site. Similarly, R. communis and A. nilotica accumulated higher amounts of Mn, Zn and Fe at Nawababad and New Lahore sites compared to the rest of the species. Nonetheless, Z. mauritiana accumulated higher amounts of Ni at all sites compared with the other species included in the study. Soil surface contributed towards the uptake of heavy metals in leaves; therefore, wild plant species should be grown near the roadsides to control heavy metals pollution. Results revealed that wild plants growing along roadsides accumulate significant amounts of heavy metals. Therefore, these species could be used to halt the vehicular pollution along roadsides and other polluted areas.
A pot experiment was conducted in University of Agriculture Faisalabad to assess the effect of Cu and Zn uptake on morphological, physiological, biochemical and yield attributes of Helianthus annuus L.(Sunflower). Two hybrids FH-612 and FH-621 were used during this study. The experiment was laid out in a Completely Randomized Design (CRD) with four treatments and three replicates. After 20 days of germination the plants were subjected to different levels of ZnCl2, CuSO4 and with their combination. Three harvests were taken at an interval of seven days each to study the growth rate, morphological, physiological and biochemical attributes. At the maturity of crops final harvest was taken and yield attributes were recorded. Data of various attributes were statistically analyzed. It was observed that both the metals caused negative effect on growth rate as well as the other parameters studied. The effect was more pronounced in the metal combination treatment. Ultimately the yield was significantly reduced due to the effect of metals in both hybrids. However hybrid FH-612 revealed slight tolerance towards Cu and Zn toxicity as compared to its counterpart. FH- 621. Thus it was concluded that Cu and Zn affect the morphological, physiological and yield attributes of sunflower when applied in higher concentration.
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