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Asian Journal of Plant Sciences
Year: 2020  |  Volume: 19  |  Issue: 4  |  Page No.: 383 - 389

Effect of High Salicylate Concentrations on Growth and Levels of Aromatic Compounds in Six Plant Species

Ragab A. EL-Mergawi and M.S.A. Abd El-Wahed    

Abstract: Background and Objective: Salicylic acid, a natural phenolic compound synthesized in plants through the shikimic acid pathway. In the search for a cheap nature product with high and selective effects on weeds, this study was conducted to evaluate the phytotoxicity of salicylates at high doses on plant growth and determine the changes that induced in the levels of endogenous aromatic compounds in the tissues of six plant species. Materials and Methods: Salicylic acid and acetylsalicylate at 25, 50 and 100 mM were foliar sprayed on 5-weeks-old of three summer crops, maize, sunflower and cotton and three summer weeds, purslane, jew's mallow and barnyard grass. Analyses were performed in triplicate. Analysis of variance and comparison of treatment means with LSD at 5% level were performed using Stat Graphics Plus Version 5.1. Results: Salicylate treatments caused severe injury effects on all examined plants, after 7 days from treatments. Acetyl salicylate treatments tended to cause higher injury effects on target species than salicylate acid treatments. However, after 35 days of treatments, the growth criteria of treated plants did not differ significantly from those of control plants. All treatments tended to increase the levels of endogenous salicylic acid, phenylalanine and tyrosine and decreased tryptophan contents. Conclusion: Salicylates tended to induce great changes in the levels of endogenous salicylic acid and aromatic amino acids, however, these compounds did not produce any permanent phytotoxic effects on tested plants.

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