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  • 1 Department of Botany, Faculty of Science, Mansoura University Mansoura, Egypt
  • | 2 Department of Botany, Faculty of Science, Mansoura University Mansoura, Egypt
  • | 3 Department of Botany, Faculty of Science, Mansoura University Mansoura, Egypt
  • | 4 Department of Botany, Faculty of Science, Mansoura University Mansoura, Egypt
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The objective of this study was to investigate the effect of soil drench with three different concentrations of CdCl2 on pigments content, photosynthetic activity, carbohydrate contents and productivity of Sorghum bicolor L. cv. 'Dorado' plants throughout various stages of plant growth and development. Also particular interest was focussed on the effect of grain presoaking with kinetin to ameliorate the toxicity effects exerted by the different levels of CdCl2. In the majority of cases, grain pretreatment with kinetin increased photosynthetic pigments, photosynthetic activity, Hill reaction as well as carbohydrate contents in leaves of cadmium treated sorghum plants. In general, the observed decrease in yield and yield attributes of sorghum plants in response to Cd2+ treatments was accelerated particularly when grains were presoaked in kinetin. The ameliorating effect of kinetin was more pronounced at 1 mM CdCl2. Grain priming with kinetin increased grain biomass (i.e. fresh and dry weights), carbohydrates, protein and ion contents in yielded grains of cadmium treated sorghum plants. Cadmium treatments altered the balance of growth bioregulators in developed grains of sorghum plants. Thus, CdCl2 at all the used concentrations exerted a significant decrease in growth promotor levels with an increase in growth inhibitory substances equivalent to abscisic acid. On the other hand, grain priming with kinetin increased the growth promotory substances and reduced abscisic acid levels.

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