title: In vitro antifungal activity of four chemotypes of Lippia alba (Verbenaceae) essential oils against Alternaria solani (Pleosporeaceae) isolates.
abstract: Several volatile natural compounds produced by plant secondary metabolism have been proven to present antimicrobial action, enabling their use in phytopathogen control. They also present low environmental impact when compared to conventional pesticides. Essential oils contain these compounds and can be found in several plant species, such as Lippia alba (Mill.) N.E. Brown (Verbenaceae). Essential oils of four chemotypes of L. alba, characterized by their major compounds, namely camphor, citral, linalool and camphor/1,8-cineole, were tested against the phytopathogen Alternaria solani Sorauer (Pleosporaceae), which causes early blight on tomatoes and is responsible for great economic losses regarding production. Essential oils antifungal action was tested in vitro using potato dextrose agar medium with essential oil concentrations at 0.1, 0.5, 1.0, 1.5 and 2.0 µL mL-1. The chemotype that had the best performance was citral, showing significant inhibition compared to the others, starting at the 0.5 µL mL-1 concentration. The essential oil belonging to the linalool chemotype was efficient starting at the 1.5 µL mL-1 concentration. Conversely, the camphor chemotype did not show any action against the phytopathogen. Moreover, the essential oils had no remarkable effect on tomato germination and growth. In conclusion, these essential oils presented fungicidal action against A. solani.
authors.affiliation: Instituto de Biotecnologia, Universidade de Caxias do Sul, Rua Francisco Getúlio Vargas, 1130, Petrópolis, 95070-560 Caxias do Sul, RS, Brasil, Universidade de Caxias do Sul, Universidade de Caxias do Sul, Instituto de Biotecnologia, Caxias do Sul RS , Brasil.
authors.forename: Elisa Z
authors.initials: EZ
authors.lastname: Tomazoni
authors.affiliation: Instituto de Biotecnologia, Universidade de Caxias do Sul, Rua Francisco Getúlio Vargas, 1130, Petrópolis, 95070-560 Caxias do Sul, RS, Brasil, Universidade de Caxias do Sul, Universidade de Caxias do Sul, Instituto de Biotecnologia, Caxias do Sul RS , Brasil.
authors.forename: Márcia R
authors.initials: MR
authors.lastname: Pansera
authors.affiliation: Instituto de Biotecnologia, Universidade de Caxias do Sul, Rua Francisco Getúlio Vargas, 1130, Petrópolis, 95070-560 Caxias do Sul, RS, Brasil, Universidade de Caxias do Sul, Universidade de Caxias do Sul, Instituto de Biotecnologia, Caxias do Sul RS , Brasil.
authors.forename: Gabriel F
authors.initials: GF
authors.lastname: Pauletti
authors.affiliation: Instituto de Biotecnologia, Universidade de Caxias do Sul, Rua Francisco Getúlio Vargas, 1130, Petrópolis, 95070-560 Caxias do Sul, RS, Brasil, Universidade de Caxias do Sul, Universidade de Caxias do Sul, Instituto de Biotecnologia, Caxias do Sul RS , Brasil.
authors.forename: Sidnei
authors.initials: S
authors.lastname: Moura
authors.affiliation: Instituto de Biotecnologia, Universidade de Caxias do Sul, Rua Francisco Getúlio Vargas, 1130, Petrópolis, 95070-560 Caxias do Sul, RS, Brasil, Universidade de Caxias do Sul, Universidade de Caxias do Sul, Instituto de Biotecnologia, Caxias do Sul RS , Brasil.
authors.forename: Rute T S
authors.initials: RT
authors.lastname: Ribeiro
authors.affiliation: Instituto de Biotecnologia, Universidade de Caxias do Sul, Rua Francisco Getúlio Vargas, 1130, Petrópolis, 95070-560 Caxias do Sul, RS, Brasil, Universidade de Caxias do Sul, Universidade de Caxias do Sul, Instituto de Biotecnologia, Caxias do Sul RS , Brasil.
authors.forename: Joséli
authors.initials: J
authors.lastname: Schwambach
mesh_terms: D000528:Alternaria / Q000187:drug effects*; D032411:Lippia / Q000737:chemistry*; D009822:Oils, Volatile / Q000494:pharmacology*; D010938:Plant Oils / Q000494:pharmacology*
chemical_list: D009822:Oils, Volatile; D010938:Plant Oils