Effects and relative toxicity of heavy metals on Cuscuta reflexa |
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| Authors: | Sasadhar Jana Tinkari Dalal Basabi Barua |
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| Institution: | 1. Plant Physiology and Biochemistry Laboratory, Postgraduate Department of Botany, Darjeeling Government College, Darjeeling 734101, West Bengal, India
2. Botany Department, Burdwan University, Burdwan 713104, West Bengal, India
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| Abstract: | The effects of four concentrations (0.5, 1, 5 and 10 μg mL?1) of the heavy metals Hg, As, Pb, Cu, Cd, and Cr on some senescence variables of Cuscuta reflexa Roxb. were studied. All of the treatments, except 0.5 μg mL?1, decreased Hill reaction activity, chlorophyll and protein contents and dry matter percentage in biomass and increased tissue permeability over control data. The harmful effects of the metals were best visible at 10 μg mL?1. The general order of sensitivity was As > Cd > Pb > Hg > Cu > Cr (absolute metal concentration). The data suggest that Cuscuta reflexa shows tolerance to the heavy metals tested up to 0.5 μg mL?1. |
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