Investigation on allelopathic activity of chalcone and its nanoparticle derivative

Tashviginezhad, Mina and Razavi, Seyed Mehdi and Ghasemian, Alireza and Asadi, Asadolah and Nasrollahi, Parisa (2019) Investigation on allelopathic activity of chalcone and its nanoparticle derivative. Masters thesis, University of Mohaghegh Ardabili.

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Abstract

Research Aim: The present research synthesized with PLGA polymer chalcone polymeric nanoparticles and was carried out to investigatethe possibility of optimal and environment-friendlyusage of chalcone and nanoparticle chalcone derivative to fight against herbal pests and weeds. Research method:In this research, the inhibitory effects of chalcone and its nanoparticle derivative evaluated on some herbal pathogenic fungi such as Sclerotinia sclerrotiorum, Aspergillusfumigatus, Aspergillusflavus, Fusariumgraminearum, and some pathogenic bacteria such as Erwinia coratova, Xanthomonascompestris and Bacillus cereus by using of disc spreading and MIC determination methods.Morover, inhibitory effects of these compounds on the germination and growth of common weed including: Amaranthus retrflexus, Portulaca oleracea, Medicago sativa, Trifoliumalexandrinum L. were studied. The examinations were performed by preparation of chalcone and its nanoparticle derivative at (0.001, 0.01, 0.1, 1 ml/ml)concentrations for seeds, at (0.25,0.5, 1.5, 1, 2 mg/ml) concentrations for fungi,and at (1, 10, 20, 30, 40 mg/ml)concentrations for bacteria; and their effects were evaluated on in-plate treatment. Data were analyzed by SPSS 21 software. Findings: Results showed that chalcone has significant decreasing effect on seed germination, radicle and shoot growth in all concentrations at 5% probability, and increasing the concentration of chalcone decreased fungus growth, but increasing the concentration of chalcone exhibited a weak antibacterial effect especially on gram negative bacteria. The results showed that chalcone at concentrations of 1 mg/ml completely affected seed of Amaranthus retroflexus, chalcone nanoparticles had more decreasing effecton fungus growth in comparison with chalcone,so that it decreased fungus growth by30% but not for bacteria. Conclusion:According to the results, chalcone and chalcone nanoparticles can be suggested as replacement of harmful chemicals against pests and weeds. Chalcone nanoparticles were more effective.

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