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Updated: Feb 2, 2026

Repeatable Stair-step Assay to Access the Allelopathic Potential of Weedy Rice Oryza sativa ssp.
Published on: January 28, 2020
Chemical constituents and allelopathic activity of Machaerium eriocarpum Benth
Charlyana Carvalho Bento1, Marcelo Marucci P Tangerina2, Ana C Zanatta3
1Escola de Artes, Ciências e Humanidades, USP - Universidade de São Paulo, São Paulo-SP, Brazil.
Abstract:
The analysis by HPLC-PDA of the hydroalcoholic extract of the leaves of M. eriocarpum together with the injection of the fractions containing the already identified metabolites allowed the detection of at least 5 flavonoids, of which two are derived from apigenin and three from luteolin. After isolating larger amounts of isovitexin (I), assays were performed to evaluate the allelopathic activity together with the crude extract. The results show that the initial inhibition indexes were very similar to those observed in the treatments with F17 (Fraction enriched in isovitexin) and F18 (isovitexin), mainly in the concentrations of 500 and 1000 mg L-1. The index of the number of lateral roots, an increase of the inhibitory effect is observed with the increase of the concentration of M. eriocarpum extract.
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