Vol. 13 No. 3
Evaluation of groundnut (Arachis hypogaea L.) genotypes for cadmium tolerance
Author(s): D. Dutta, A. Pal, J. Sen, A. K. Pal and S. Gunri
Abstract: Seedlings of 13 genotypes of groundnut [Arachis hypogaea L.] were raised in sand culture using modified Hoagland solution and were exposed to cadmium stress by supplementing 300 μM cadmium. Perusal of data indicated significant reduction in root length, fresh and dry weight of root as well as total dry weight of the plant under cadmium treatment. On the basis of reduction in seedling dry weight the tolerance indices (TI) were calculated for the genotypes under study and three most tolerant and susceptible genotypes were identified to study the physiological basis of tolerance. The results showed that the tolerant genotypes registered much higher increase in phenol content and guaiacol peroxidase activity in their leaves but less increase in lipid peroxidation and electrolyte leakage of solutes in roots as compared to the susceptible ones. The tolerant genotypes also recorded lower reduction in leaf chlorophyll under cadmium treatment. Three genotypes, ISK-2014-04, ISK-2014-12 and TG 51 were identified as the most tolerant in the present experiment.
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