Effectiveness of potassium in mitigating the salt-induced oxidative stress in contrasting tomato genotypes |
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Authors: | Muhammad Amjad Javaid Akhtar Muhammad Anwar-ul-Haq Muhmmad Atif Riaz Zulfiqar Ahmad Saqib Behzad Murtaza |
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Institution: | 1. Department of Environmental Sciences, COMSATS Institute of Information Technology, Vehari, Pakistanamjad_ses@yahoo.com;3. Institute of Soil and Environmental Sciences, University of Agriculture, Faisalabad, Pakistan;4. Saline Agriculture Research Centre, University of Agriculture Faisalabad, Pakistan;5. Nuclear Institute for Agriculture and Biology, Faisalabad, Pakistan;6. Department of Environmental Sciences, COMSATS Institute of Information Technology, Vehari, Pakistan |
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Abstract: | To check the efficacy of potassium in alleviating oxidative stress under salt stress, salt-tolerant (Indent-1) and salt-sensitive (Red Ball) tomato (Lycopersicon esculentum Mill.) genotypes were exposed to three levels of sodium chloride (NaCl) (0, 75, 150 mM) and two levels of potassium (4.5 and 9 mM) in solution and foliar form. Thirty days of treatments revealed that increasing NaCl stress increased lipid peroxidation (malondialdehyde, MDA) and correspondingly the activity of antioxidant enzymes (superoxide dismutase, SOD; catalase, CAT; and glutathione reductase GR) in both genotypes. However, higher potassium (K) level in solution or foliar spray during the salt-induced stress decreased MDA and antioxidant activity and increased the growth in salt-tolerant genotype than in the salt-sensitive genotype. Decrease in MDA concentration, activity of antioxidant enzymes, and increase in the growth of tomato plants by the application of potassium under salt stress suggest that potassium is an effective ameliorating agent against salt-induced oxidative damage. |
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Keywords: | Antioxidants MDA Lycopersicon esculentum salt stress plant growth |
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