Abstract
Plant bacterial disease is most groups of plant diseases that can be managed only with a few chemical poisons or some expensive antibiotics; to decrease chemical materials and replacing them with natural compounds, a lot of studies have been done. In this study antibacterial activity of some plant extracts of Citrullus colocynthis was screened in a low concentration (4μg/disc) against some plants bacterial diseases. MIC was obtained by serial dilution method. Total phenol content and polyphenol determination was revealed in range by plate reader set and High Perfect Liquid Chromatography set. At this concentration, all extracts of Citrullus colocynthis showed antimicrobial activity to Erwinia amylovora and Bacillus subtilis, a resistant bacterium. Other resistant bacteria like; Xanthomonas axnopodis pv citri and Pseudomonas flouresence had not showed any antibacterial effect to all extracts. Chemical analyzing detect total phenol content and about 12-15 polyphenol materials in Citrullus colocynthis, only one of them recognized, It was Gallic acid and was the first repot compound in this plant .
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