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Plant extracts inducing systemic resistance in Solanum lycopersicum (tomato) seedlings against Rhizoctonia solani: modulating antioxidant enzymes and PR-proteins expression

Nabeela Afzal, Faisal Mehdi, Shagufta Sahar, Saddia Galani, Saleem Shahzad and Abid Azhar


Intensive and indiscriminate use of fungicides is responsible for environmental pollution effecting the living organisms. Natural plant extracts emerge to be potential candidates having competitive abilities to overcome the plant pathogens without effecting human health and environment. Rhizoctonia solani, a root rot causing agent is responsible to cause huge economic losses with limited controlling agents available. The effect/potential of two plant extracts neem (Azadirachta indica) and eucalyptus (Eucalyptus globulus) was studied against R. solani on tomato seedlings. The altered biochemical activities and stress induced markers were monitored in diseased and treated conditions for tomato seedlings at different growth intervals. Results revealed that stress induced markers such as accumulation of hydrogen peroxide (H2O2), Malondialehyde (MDA) indicated significant increase as compared to the control. Antioxidant enzymes like superoxide dismutase (SOD), catalase (CAT) and peroxidase (POD) enzymes were also significantly increased in diseased plants treated with plant extracts. Moreover, during protein expression analysis, presence of low molecular proteins PR-2 (33-37kDa) were evident in diseased plants treated with neem and eucalyptus extracts as compared to control. Thus, it is concluded that application of plant extracts triggered systemic resistance by the expression of pathogenesis related proteins (PR) and alteration of antioxidant enzyme activities in tomato seedlings

To Cite this article: Afzal, N., F. Mehdi, S. Sahar, S. Galani, S. Shahzad and A. Azhar. 2022. Plant extracts inducing systemic resistance in Solanum lycopersicum (tomato) seedlings against Rhizoctonia. Pak. J. Bot., 54(1): DOI:  

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