Abstract— Plant species able to produce phytotoxic substances are widely studied in agronomy because when identified and isolated can lead to herbicides or insecticides less toxic than current pesticides. Knowing the ecological characteristics of the Neea theifera species in cerrado biome, this study aimed to evaluate the phytotoxic effect of extracts and fractions of leaves and screen the secondary compounds in the methanol extract. The organic extracts and fractions showed phytotoxic potential in germination indexes, the initial growth of the root system and the mitotic index of L. sativa. In phytochemical screening performed by HPLC-PAD was possible to identify the presence of phenolic compounds, mainly flavonoids, a secondary class of compounds widely known in the literature for its medicinal and allelopathic actions. Therefore, according to the results it can be concluded that the species N. theifera is capable of producing phytotoxic compounds, since the leaf extracts and fractions changed the pattern germination indexes, root length and mitotic index of lettuce.
Keywords— germination indexes, HPLC-PAD, mitotic index, Phytotoxicity, Root length.
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