Activity Of Adesmia Boronioides Resinous Exudate Against Phytopathogenic Bacteria

Resinous exudate obtained from the aerial parts of <i>Adesmia boronioides</i> Hook.f. were evaluated to determine anti-phytopathogenic effects. Briefly, resinous exudate was obtained by dipping fresh plant material in dichloromethane; chemical composition was determined by GC-MS; and minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) were evaluated against four phytopathogenic bacteria. Resinous exudate yield was 8.5% (resin/fresh plant), of which esquel-6-en-9-one (14.25%), esquel-7-en-9-one (5.86%), and veratric acid (2.59%) were the effective antibacterial compounds. Tested against <i>Pectobacterium carotovorum</i> subsp. <i>carotovora</i>, <i>Erwinia amylovora</i>, <i>Bacillus subtilis</i>, and <i>Pseudomonas syringae,</i> MICs and MBCs ranged from 16 to 128 µg/mL and 32-256 µg/mL, respectively. These results provide initial evidence that resinous bush <i>A. boronioides</i> is a new and alternative source of substances with agricultural interest.