Allelopathic Activity and Chemical Analysis of the Essential Oil of Croton limae A. P. S. Gomes, M. F. Sales & P. E. Berry (Euphorbiaceae)

Abstract

The allelopathic activity and chemical composition of the essential oil of Croton limae A. P. S. Gomes, M. F. Sales & P. E. Berry (marmeleiro-prateado) have been evaluated in this study. The essential oil was extracted by hydro-distillation. A completely randomized design was used to test the influence of the essential oil from fresh leaves of C. limae in concentrations of 0.10%, 0.25%, 0.50%, 0.75%, 1%, 1.25%, 2.50%, 3.75%, and 5% on the germination and growth of Lycopersicum esculentum Mill. (tomato) seeds by indirect contact, with a control using water and dimethyl sulfoxide (DMSO). Each treatment consisted of five replicates using twenty seeds in each one. The chemical analysis of the essential oil was carried out using gas chromatography coupled with mass spectrometry. The analysis showed the occurrence of 14 chemical compounds, the majority of which were cedrol (28.4%), eucalyptol (17.4%) and α-pinene (13.8). The C. limae essential oil inhibited germination of the tomato seeds at concentrations of 2.50% and upwards and it affected the caulicles and radicles of tomatoes at all concentrations tested. The tests proved that C. limae presents phytotoxic activities.

Chromatographic profile and allelopathic potential of the essential oil of Acritopappus confertus (Gardner) R. M. King & H. Rob. (Asteraceae)

“…Each treatment consisted of five replicates with 20 seeds totaling 140 seeds per treatment. After sowing, 3 mL of the oil solution were distributed in two filter paper sheets at each established concentration and placed in the plate cover, adopting the indirect contact methodology (Leite et al, 2015).…”

“…Within this context, several pieces of research have proven the allelopathic action in species of botanical substances, such as Poaceae, Euphorbiaceae, Lamiaceae, Asteraceae, among others. (Oliveira, Belinelo, Almeida, Aguilar, & Vieira Filho, 2011;Miranda et al, 2015b;Leite, Silva, M. Santos, A. Santos & Costa, 2015;Alencar et al, 2015). Asteraceae, Research, Society and Development, v. 9, n. 12, e1991210450, 2020 (CC BY 4.0) | ISSN 2525-3409 | DOI: http://dx.doi.org/10.33448/rsd-v9i12.10450 6 one of the most numerous groups within the Angiosperms, has approximately 24,000 species grouped into more than 1,600 genera comprising mostly small herbs and shrubs, and rarely trees.…”

Chemical components of the volatile and non-volatile extractives of Croton species and their microbial activities

“…Essential oil compounds derived from plants have been widely used in the treatment of respiratory tract, urinary tract, gastrointestinal tract infections as well as skin infections (Bikanga et al, 2010;Mulholland et al, 2010;Leite et al, 2015). Since the essential oil compounds of Croton spp.…”