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. 2020 Feb;27(4):4376-4389.
doi: 10.1007/s11356-019-06631-8. Epub 2019 Dec 12.

Synergistic Effect of Cordia Curassavica Jacq. Essential Oils Association Against the Phytopathogen Xanthomonas Campestris Pv. Campestris

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Synergistic Effect of Cordia Curassavica Jacq. Essential Oils Association Against the Phytopathogen Xanthomonas Campestris Pv. Campestris

Rafael Salomão Da Silva et al. Environ Sci Pollut Res Int. .

Abstract

The increased use of pesticides applied to treat diseases caused by bacteria has caused serious environmental problems. There are few fungicides/bactericides for the treatment of plant diseases caused by Xanthomonas campestris pv. campestris (Xcc), and only two natural products with general bactericidal/fungicidal use are available on the market. Thus, this study evaluated the antimicrobial activity of essential oils (EOs), and their combinations, from five distinct genotypes of Cordia curassavica (Jacq.) Roem. & Schult (Syn. Varronia curassavica Jacq.) (CCUR) against Xcc. GC/MS chemical analysis revealed α-pinene, sabinene, (E)-caryophyllene, ar-curcumene, β-sesquiphellandrene, 7-cyclodecen-1-one, and ar-Turmerone as the major compounds of the five EOs of CCUR. All EOs showed growth inhibition of Xcc with minimum inhibitory concentration between 500 and 1000 μg mL-1. The associations between two EOs from different CCUR genotypes showed that 70% of the total combinations had an additive effect. However, the combinations between CCUR-002 × (-302, -202) and CCUR-302 × (-601) showed a synergistic effect, with mean fractional inhibitory concentration FIC50 values of 0.28, 0.42, and 0.40, respectively. This study demonstrates that combinations of C. curassavica EOs have antimicrobial activity and a potential to be used in the control of black rot. Graphical abstract.

Keywords: Antimicrobial activity; Biological control; Black rot; Cruciferous; Interaction; Medicinal plants; Phytobacteria.

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