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Effect of 28-homobrassinolide on antioxidant defence system in Raphanus sativus L. under chromium toxicity

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Abstract

Heavy metals have emerged as major environmental contaminants due to rapid industrialization and urbanization. The genotoxic, mutagenic and carcinogenic effects of heavy metal like chromium (Cr) on man, animals and plants have been documented. In plants, accumulation of heavy metals beyond critical levels generates oxidative stress. This stress is generally overcome by antioxidant defence system and stress shielding phytohormones. Thus, the present study has been focused to analyze the effect of one of imperative group of plant hormones, i.e., brassinosteroids (BRs) which have been reported for its protective properties for wide array of environmental stresses. Raphanus sativus L. (Pusa Chetaki) seeds pre-treated with different concentrations of 28-homobrassinolide (28-HBL) were raised under various concentrations of Cr(VI). It was observed that 28-HBL treatment considerably reduced the impact of Cr-stress on seedlings which was evinced upon analysis of morphological and biochemical parameters of 7-days old radish seedlings. The toxic effects of Cr in terms of reduced growth, lowered contents of chlorophyll (Chl), protein, proline; increased malondialdehyde (MDA) content and elevated metal uptake were ameliorated by applications of 28-HBL. Also, the activities of all the antioxidant enzymes except guaiacol peroxidase (POD), increased significantly when subjected to Cr stress in combination with 28-HBL. Overall, seed pre-soaking treatment of 28-HBL at 10−7 M was most effective in ameliorating Cr stress. The present work emphasizes the protective role of 28-HBL on regulation of antioxidant enzymes and its possible link in amelioration of stress in plants.

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Acknowledgments

Financial assistance from Department of Science and Technology (DST), Ministry of Science & Technology, Government of India, New Delhi, India is duly acknowledged.

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Authors and Affiliations

  1. Department of Botanical and Environmental Sciences, Guru Nanak Dev University, Amritsar, Punjab, 143005, India

    Indu Sharma & Renu Bhardwaj

  2. Department of Biotechnology, Guru Nanak Dev University, Amritsar, Punjab, 143005, India

    Pratap Kumar Pati

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  1. Indu Sharma
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  2. Pratap Kumar Pati
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Correspondence to Renu Bhardwaj.

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Sharma, I., Pati, P.K. & Bhardwaj, R. Effect of 28-homobrassinolide on antioxidant defence system in Raphanus sativus L. under chromium toxicity. Ecotoxicology 20, 862–874 (2011). https://doi.org/10.1007/s10646-011-0650-0

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