Allelopathic effect of the aqueous extract of leaf and fruit of Solanum paniculatum L on seeds of Allium cepa L

Abstract

The objective of this work was to evaluate the allelopathic effect of aqueous extracts of leaf
and fruit of Solanum paniculatum L. on the germination and development of onion. The design
was completely randomized with a simple factorial scheme, with seven concentrations and four
replications. The analyzed variables were: percentage of germination, first count, shoot length
and root length. Data were submitted to analysis of variance (ANOVA) and regression, and the
means were compared by the Tukey test at 5%. There was a significant difference between
leaf and fruit extracts concentrations. In both extracts the highest concentrations were the most
inhibitory. The aerial and root development of the seeds were totally inhibited at concentrations
of 50 and 100 mg mL-1. The extract obtained from the fruit of Solanum paniculatum L. was
more allelopathic when compared to leaf extract