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Fractions of the Lippia origanoides extract induce the polyphenol oxidase and phenylalanine ammonia lyase enzymes in Solanum lycopersicum

de Barros, Paulo Nogueira, de Lima Costa, Dannielle, Santana, Antônio Euzébio Goulart, Leal, Gildemberg Amorim, Jr
European journal of plant pathology 2019 v.153 no.1 pp. 79-88
Anadenanthera colubrina, Astronium urundeuva, Lippia origanoides, Mimosa tenuiflora, Solanum lycopersicum, antifungal properties, catechol oxidase, chloroform, crops, cultivars, dry environmental conditions, enzyme activity, ethanol, ethyl acetate, fungi, fungicides, hexane, in vitro studies, induced resistance, introduced plants, medicinal properties, methanol, pathogens, phenylalanine ammonia-lyase, polyphenols
The resistance of the pathogenic fungi to fungicides and the perspective of induced resistance to plants guides the search for molecules to promote the sustainable control of agricultural crop diseases. The exhaustion of conventional sources gives a direction for the search of exotic plants from arid environments or with medicinal properties. This study aims to evaluate the antifungal activity of the Anadenanthera colubrina, Lippia origanoides, Mimosa tenuiflora and Myracrodruon urundeuva species and subsequently the specie with the best antifungal activity was used to evaluate the potential in inducing the enzyme activity. The antifungal effect was determined with 10 fungi using the crude ethanol extract at 100 and 1000 μg mL⁻ ¹ concentrations. The L. origanoides extract was the most effective and inhibited 100% of the pathogens. The L. origanoides extract was fractioned with hexane, chloroform, ethyl acetate and methanol. The hexane fraction inhibited 100% of the growth of pathogens at 400 μg mL⁻¹. The in vitro evaluation of the ability to induce enzymes in Solanum lycopersicum (Micro-Tom cultivar) was determined with the increase of oxidative enzymes, polyphenol oxidase and phenylalanine ammonia lyase activity. The ability to induce enzymes was determined with 400 μg mL⁻¹ of the crude extract and L. origanoides fractions. The crude extract did not induce the enzyme activity and the fractions induced the polyphenol oxidase and phenylalanine ammonia lyase enzymes. The results confirmed the broad spectrum antifungal activity of the L. origanoides crude extracts. The partition revealed fractions with different capacities to induce enzymes associated to the resistance that was not revealed by the crude extract.