National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
The effect of elevated concentrations of mercury on seed germination and seedlings growth responses of three Brassica juncea L. cultivars, namely Varuna, Kranti, and Pusa Jai Kisan. was evaluated. The mercury concentrations (0, 25, 50, 100, 200 µM) suppressed seed germination significantly in concentration dependent manner and differentially among the cultivars. The inhibition due to Hg was much greater after one day of treatment with lowest suppression in cv. Varuna than others. In seedling growth performance, Root growth was inhibited quite strongly, with highest and lowest inhibition in cv. Pusa Jai Kisan and Varuna respectively. Shoot growth was not affected much in all cultivars. The seedling fresh weight in general reduced. Activity of α-amylase and MDA content were differentially altered among all cultivars studied. Also, significant increase in α-amylase activity was observed in cv. Varuna when compared with other cultivars. The CAT activity was marginally promoted by Hg in cultivar Pusa Jai Kisan and Kranti. The SOD activity was not strongly influenced due to Hg treatments. The results seem to be a consequence of differential sub cellular Hg distribution and antioxidative defence resulting in constitutive activity of SOD and CAT. Findings have implication in establishment of seedlings in mercury enriched soils and in turn of phytoremediation.
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