Element content, growth and metabolic changes in Cu- and Cd- stressed Phaseolus vulgaris plants


Element content, growth and metabolic changes in Cu- and Cd- stressed Phaseolus vulgaris plants


Mahmoud E. Younis *, Shaimaa M. N. Tourky and Shaimaa E. A. Elsharkawy
Botany Department, Faculty of Science, University of Mansoura, Mansoura, Egypt


Journal of Plant and Environmental Research

A large-scale pot experiment was accomplished for investigation of the varied effects of different concentrations of Cu and Cd on certain growth and metabolic attributes of roots and shoots of Phaseolus vulgaris plants, over a period of three weeks. Plants supplemented with Cu and Cd at the concentrations of 10-6 and 10-3 M, showed increased levels of Cu and Cd in both shoots and roots, above those levels in controls. However, Cu or Cd accumulation was lower in shoots than in roots. As compared with control levels, the low (10-6 M) concentration of Cu induced either a significant or an insignificant increase in growth parameters, photosynthetic pigments, PS II activity, glucose, proline and glycine contents in both roots and shoots. Otherwise, insignificant decreases in fructose, sucrose, polysaccharides, total saccharides, total soluble-N, protein –N, DNA and RNA contents, in the same test plant parts, were obtained. A reverse situation was however observed with the high concentration (10-3 M) of Cu as well as with the low and high concentrations (10-3 and 10-6 M) of Cd. In general, the observed adverse effects were more pronounced with Cd at (10-6 M) as compared with those maintained with Cu at the same concentration. Furthermore, the most detrimental adverse effects were apparent upon administration of the high (10-3 M) concentration of Cd. The prominence of the above mentioned changes in growth and metabolism to stress tolerance in common bean is discussed.


Keywords: Phaseolus vulgaris, Cu, Cd, growth parameters, photosynthetic components, carbohydrate and nitrogenous constituents and nucleic acids.

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How to cite this article:
Mahmoud E. Younis, Shaimaa M. N. Tourky and Shaimaa E. A. Elsharkawy.Element content, growth and metabolic changes in Cu- and Cd- stressed Phaseolus vulgaris plants. Journal of Plant and Environmental Research, 2018,3:9. DOI:10.28933/jper-2018-07-2001


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