Flavonoids can stimulate degradation pathways and affect the stability of membrane transporters, as well as modify plant growth. Flavonoids play important roles in plant development, primarily in modulating the transport of the growth phytohormone auxin. Plants produce and release, in different ways, numerous allelochemicals that affect the development of local biota, such as organic acids and phenolic compounds. Natural plant compounds, produced through secondary metabolism pathways, are called allelochemicals when they are released into the environment and affect the development and growth of neighboring plants or microorganisms. These results indicate the phytotoxic potential of Miconia allelochemicals, since there was the appearance of abnormal seedlings and growth reduction. The seedlings showed structural changes, such as yellowing, nonexpanded cotyledons, and less branched roots. Chloroform fractions and myricetin were the most inhibitory bioassays evaluated. The results showed that seedling growth was affected in a dose-dependent manner, with the root most affected and the seedlings of the lettuce, morning glory, and sourgrass as the most sensitive species, respectively. Phytochemical analysis revealed the presence of flavonoids, isolated myricetin, and a mixture of quercetin and myricetin. The growth bioassays were conducted with Petri dishes with lettuce, morning glory, and sourgrass seeds incubated in germination chambers. ligustroides and to evaluate these and the isolated metabolites phytotoxicity on the growth of the target species. Therefore, we aimed to carry out a preliminary phytochemical analysis of crude extracts and fractions of Miconia auricoma and M. Native flora represents a source of unexplored metabolites with multiple applications, such as bioherbicides.
Studies that provide the use of alternative methods for weed control, in order to minimize negative impacts on the environment, have intensified. Weeds pose a problem, infesting areas and imposing competition and harvesting difficulties in agricultural systems.
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