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DPPH (2,2-Diphenyl-1-Picrylhydrazyl) free radical scavenging activity of tomato genotypes against PEG simulated drought stress

Rizwan Taj Khan, Syed Dilnawaz Ahmed Gerdezi, Tariq Habib and Syed Rizwan Abbas

Antioxidants are important substances of plants which are used to save their bodies from injuries by free reactive oxygen species. The experiment was performed to check the effect of polyethylene glycol on 26 tomato genotypes at ESMA (Extension Services and Management Academy) at Garri Dopatta, Azad Kashmir, Pakistan. The 2,2-Diphenyl-1-Picrylhydrazyl  was used as an oxidant to produce the free radicals. The antioxidant behavior was found to be increased by increasing the sample concentration ranging from 25 µl to 500 µl extract concentration and decreased by increasing the Polyethylene glycol concentration. The genotype G-21-006234 showed highest antioxidant activity 53.03% at 25 µl sample extract concentration and radical scavenging activity has enhanced up to 71.54% as sample concentration was increased up to 500 µl. The activity of antioxidants was declined with an increase in polyethylene glycol concentration. Genotype G-21-00643 showed 21.189% antioxidant activity at 12.5% of polyethylene glycol. Which showed G- 31- 19289 genotypes had 52 % at 25ul sample amount at control and 39% at maximum of polyethylene glycol concentration. The results indicate that genotype G- 31- 19289 is good among the studied genotypes in antioxidant behaviour

To Cite this article: Khan, R.T., S.D.A. Gerdezi, T. Habib and S.R. Abbas. 2019. DPPH (2,2-Diphenyl-1-Picrylhydrazyl) free radical scavenging activity of tomato genotypes against PEG simulated drought stress. Pak. J. Bot., 51(4): DOI:

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