Abstract
Abstract This study aimed to evaluate the phytotoxic activity of aqueous extracts of species from the Cerrado of Mato Grosso on the germination and initial development of lettuce seedlings, as well as to determine the chemical composition of the extracts. The species studied were: Davilla elliptica, Combretum laxum, Himatanthus obovatus, Diteryx alata, Curatella americana, Qualea grandiflora, Aspidosperma macrocarpon, Caryocar brasiliense, Pleroma candolleanum and Miconia albicans. Fourier Transform Infrared Spectroscopy (FTIR) and Thin Layer Chromatography (TLC) techniques were used to identify functional groups and chemical compounds. The extracts of the species D. elliptica, C. laxum, C. brasiliense and Q. grandiflora showed greater phytotoxic activity on the germination of lettuce seeds which varied between 96 and 17%. The presence of compounds such as: phenols, alkaloids, flavonoids and terpenes with phytotoxic properties was confirmed.
Highlights
AND OBJECTIVESBrazil is considered one of the largest producers and exporters of agricultural food (OECD and FAO, 2015)
This study aimed to evaluate the phytotoxic activity of aqueous extracts of species from the Cerrado of Mato Grosso on the germination and initial development of lettuce seedlings, as well as to determine the chemical composition of the extracts
All extracts studied showed values within those mentioned above, and the maximum value of osmotic potential obtained was -0.04 MPa corresponding to the species H. obovatus and A. macrocarpon
Summary
AND OBJECTIVESBrazil is considered one of the largest producers and exporters of agricultural food (OECD and FAO, 2015). High production implies a large consumption of agricultural inputs for the country, occupying since 2008 the first place in the ranking associated with the use of pesticides for the control of pests and diseases, a fact that has caused environmental problems and human intoxication (Londres, 2011). One of the most promising alternatives to reduce dependence on synthetic herbicides is the use of plants that allow the development of bioherbicides from their allelochemical potential. In this scenario, there is a growing advance in the search for new species with allelopathic potential, which result in future works of chemical prospecting of the bioactive compounds (Pereira et al, 2018)
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