Abstract

MALERVA-DIAZ, Abigail; CANDELARIA-MARTINEZ, Bernardino  and  RODRIGUEZ-AVILA, Norma Laura. Allelopathic effect of Metopium brownei and Viguiera dentata on Senna uniflora. Rev. Mex. Cienc. Agríc [online]. 2023, vol.14, n.2, pp.185-195.  Epub June 19, 2023. ISSN 2007-0934.  https://doi.org/10.29312/remexca.v14i2.3015.

Allelopathy is a biological phenomenon in which chemicals released by one plant species directly influence the growth and development of another; therefore, allelopathic species can be a natural source of herbicides. Metopium brownei and Viguiera dentata have been shown to have an inhibitory effect on plants and microorganisms. The present work aimed to determine the suppressive effect of different doses of crude extracts of M. brownei and V. dentata on the in vitro germination of a tropical weed (Senna uniflora) and Raphanus sativus, a species highly sensitive to allelochemicals. It was shown that aqueous extracts of M. brownei fruits applied at doses as low as 0.5% suppressed the germination of the weed S. uniflora by 100%. The ethanolic extracts of both species demonstrated an inhibitory effect on the germination of S. uniflora seeds at concentrations of 8% or higher. On the other hand, aqueous extracts of V. dentata flowers were the most effective in inhibiting the germination of R. sativus seeds when applied in doses higher than 15%. According to the results obtained in the present work, it is concluded that V. dentata has a strong allelopathic effect on S. uniflora when used in ethanolic and aqueous extracts, so it can be used as a bioherbicide for the control of the weed in tropical crops.

Keywords : allelopathy; bioherbicides; natural extracts; weeds.

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