Effect of foliar application with some heavy metals on washington nave orange transplants
2009
Saleh, M.H. | Mohsen, A.M. | Al_Ashkkar, R.A.
A pot experiment was carried out during the two successive seasons of 2005 and 2006 to study the effect of some heavy metals, i.e., lead (Pb), cadmium (Cd) at 200,400,800 and 1200 ppm of each and nickel (Ni) at 50,100,200 and 400 ppm as foliar sprays beside control treatment (without heavy metals), on growth, leaf pigments content as well as some physiological activities and anatomical structure of Washington navel orange transplants onto sour orange rootstock. The tested treatments of such heavy metals tended to reduce leaf water content, leaf fresh and dry weights, stomatal density, leaf eats content, thickness of leaf palisade tissue, thickness of stem -,pidermis and cortex tissues, diameter of stem vascular cylinder, thickness of root epidermis, thickness of root cortex and diameter of e root vascular cylinder. The depressing effect was more onounced with the higher concentrations of any heavy metal. On the contrary, the tested heavy metals clearly promoted spiration rate, concentration of the heavy metal in leaf tissues, proline content, peroxidase and catalase enzyme activity, ess of leaf midrib tissues, diameter of leaf midrib xylem vessel y with Ni and Pb at 200 ppm) and stem total diameter ally with higher concentrations of Pb and Ni) as well as pith ue of stem.
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