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Articles by Abdelbaki Djebaili
Total Records ( 2 ) for Abdelbaki Djebaili
  Hocine-Benabid , Mohamed Fouzi-Ghorab and Abdelbaki Djebaili
  Cadmium like other heavy metals is known to be a serious toxic element and one of the most hazardous environmental pollutants not only to soil and plants, but also to humans and animals. The increasing emission of Cd from a variety of sources because it is commonly used in many fields created a great interest about the possible movement of Cd and other heavy metals into the atmosphere, water and food chain as a result of plant uptake. The presence of a number of heavy metals creates interactions between them in soil or within the plant. This study summarizes the various effects of Cd on beans (Phaseolus Vulgaris) and its responses by studying the behaviour of the element in bean plants as reduced by Zn competition with Cd chosen for the purpose of minimizing potential damage that could result from the exposure to cadmium. Analyses were carried out using spectroscopic techniques and the results obtained have shown the great toxicity of Cd and the fragile resistance of the plant indicated by the quick response to the various concentrations of the element and the antagonistic relation with Zn added at different concentrations. The study also indicates the direct effect of pH on the availability and the bioaccumulation of the element into the plant.
  Hocine Benabid , Mohamed Fouzi Ghorab and Abdelbaki Djebaili
  Cadmium like other heavy metals is known to be a serious toxic element and one of the most hazardous environmental pollutants not only to soil and plants, but also to humans and animals. Studies carried out in different plant species have revealed that Cd is strongly phytotoxic and causes growth inhibition and even plant death, although the mechanisms involved in its toxicity are still not completely understood. The present investigation was aimed at highlighting some of the problems related to Cd and trying to answer some of the questions that have arisen as a consequence of Cd behavior and its toxic nature to plant species. The culture experiment of beans Phaseolus vulgaris was carried out in a hydroponic solution with variable Cd concentrations to determine the effects of different concentrations of Cd on photosynthesis and chlorophyll content. Chlorosis was the primary symptom caused by Cd toxic levels and this led to the study of its causes by investigating the effect of Cd on Chlorophyll formation and its content in plants. In that respect, one question appeared to be important about the nature of the effect of Cd on chlorophyll and Mg concentration was the first conclusion obtained on the basis of evidence achieved from analysis of the chlorophyll content by atomic absorption and ultra violet spectroscopy. Although some results were obtained indicating the formation of free-Mg chlorophyll suggesting the disturbance of the pigment and probably the removal of Mg caused by the increase of Cd concentrations in the chlorophyll. But more still to be achieved to suggest a possible displacement of Mg by Cd. Meanwhile a speculative view was considered to explain the matter by suggesting that Cd was rather interfering with other divalent elements such Fe and Cu which are known to be involved in the chlorophyll synthesis than Mg directly.
 
 
 
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