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Effect of Cadmium on Some of the Biochemical and Physiological Processes in Bean Plants

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Author(s): Khadijeh Bavi | Bahman Kholdebarin | Ali Moradshahi

Journal: American Journal of Plant Physiology
ISSN 1557-4539

Volume: 1;
Issue: 2;
Start page: 177;
Date: 2006;
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Keywords: Bean plants | cadmium effects | biochemical | physiological processes

ABSTRACT
Effects of different cadmium chloride concentrations (5, 10, 20, 50 and 100 μM) on some of the biochemical and physiological processes including: proline content, Hill reaction, respiration and cadmium partitioning in bean plants (Phaseolus vulgaris L. cv. Khomein) were investigated. Proline accumulation in shoots increased significantly in the presence of 10, 20 and 50 μM cadmium chloride and was reduced in nutrient solutions containing 100 μM CdCl2. Cadmium did not have any significant effect on proline accumulation in bean roots. In general, proline accumulation can be used as one of the screening tests to evaluate plants stress response to cadmium. The effect of CdCl2 on reduction of 2,6- dichlorophenolindophenol (DCPIP) in the presence of light showed that the rate of DCPIP reduction in bean chloroplasts decreased by an increase in CdCl2 concentrations in reaction mixture. However there was no significant difference in Hill reaction rate in bean plants exposed to low CdCl2 concentration as compared to control. Respiratory O2 consumption in bean roots was reduced in the presence of different concentrations of CdCl2. Besides, cadmium partitioning showed that 90% of cadmium was retained by the roots and a lesser amount was transferred to the shoots. Restriction of cadmium transport from root to shoot along with its compartmentation in root cell vacuoles can be considered as the mechanism of cadmium tolerance in this plant.
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