Evaluation of antioxidant properties of phenol, flavonoid and allopathy of Achillea wilhelmsii and Salvia officinalis L. extracts

Allelopathy is one of the methods of interspecific communication in plant communities, the study ‎of which can help to understand the interactions of plants. Therefore, this study was conducted ‎to investigate the effect of allelopathy, antioxidant properties, phenolic and flavonoid ‎compounds of different concentrations of Achillea wilhelmsii‏ ‏and Salvia officinalis L. ‎extract on ‎the germination characteristics of two species of Onobrychis viciifolia and Medicago sativa ‎in a ‎completely randomized design with 9 treatments, and 5 repetitions were performed in 2018. ‎Measured parameters included percentage and germination rate, root length, stem and seedling ‎length, mean germination time, allometric coefficient, seed vigor index and seedling fresh and ‎dry weight. The results of one-way analysis of variance showed that different concentrations of ‎the mentioned extracts had a significant inhibitory effect on germination parameters of ‎O.viciifolia and M.sativa. Also, the results of the mean comparison index showed that increasing ‎the concentration of extracts significantly reduced the studied parameters, so that the highest ‎percentage of decrease was observed in the highest concentration of aqueous extract, which can ‎be the reason is the increase in allelopathic substances and consequently the increase in toxicity ‎on the traits.