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Abstract
Piptocarpha rotundifolia (Less.) Baker stands out as one of the species with the highest frequency, density, and relative dominance in the Cerrado formations. However, no phytochemical studies have been carried out with this species to date. The aim of this study was to evaluate the phytotoxic activity of P. rotundifolia leaves in the search of new environmentally friendly tools for weed control. Thus, a wheat coleoptile and phytotoxic bioassay, using relevant agricultural weeds, was used to identify the most active extracts and fractions. The subsequent purification process allowed the isolation of 11 compounds, the phytotoxicity of which was evaluated in terms of wheat coleoptile elongation and with the most sensitive weeds. Piptocarphin A was found to be the major compound and the most active. To confirm its phytotoxic potential, the effect on Ipomea grandifolia grown in a hydroponic culture and on metaxylem cells was studied. The results obtained in this study demonstrate that the inhibitory activity displayed by P. rotundifolia leaf extract is mainly due to the presence of piptocarphin A. The phytotoxicity shown by P. rotundifolia leaf extract, and the isolated compounds, on weeds could provide new tools for weed control in agricultural fields.
Highlights
Among the world’s important biomes, the Cerrado is considered to be one of the most diverse Savanna on the planet, with more than 12,000 plant species.[1]
The aim of this study was to evaluate the phytotoxic activity of P. rotundifolia leaves in the search of new environmentally friendly tools for weed control that could be used as natural herbicide models in the future
Dry and crushed P. rotundifolia leaves were submitted for aqueous extraction and an aliquot of the resulting extract was partitioned by liquid−liquid extraction with EtOAc, resulting in the aqueous and EtOAc fractions
Summary
Among the world’s important biomes, the Cerrado is considered to be one of the most diverse Savanna on the planet, with more than 12,000 plant species.[1]. It is important to consider the discovery of natural compounds with chemical structures useful for the synthesis, for example, of natural pesticides
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