Essential oil of Lippia alba (Mill.) N.E.Br. influences the germination, vigor and emergence of lettuce seeds

Abstract

Secondary metabolites are produced by certain plant species and may influence the development of some species through the action of allelopathic effects. Thus, the objective of this study was to evaluate the allelopathic effect of Lippia alba essential oil on the germination, emergence and vigor of seedlings of different batches of lettuce seeds. This experiment was conducted in a completely randomized design with a 3´5 factorial scheme consisting of three batches of seeds of the cultivar Grand Rapids® and five doses of L. alba essential oil (0, 0.25, 0.50, 0.75 and 1.00%) diluted in distilled water and homogenized in Tween® 80. Seed germination and vigor, in the laboratory (experiment I), and emergence, in a protected environment (experiment II), were evaluated. The results demonstrated that there was an inhibitory effect with a significant reduction of germination, vigor and seed emergence when L. alba essential oil was added starting at concentrations of 0.25%. The essential oil showed allelopathic potential over different lettuce seed lots, affecting germination, vigor and seed emergence.

Chemical Composition, Allelopathic Potential, and Antimicrobial and Anticholinesterase Activity of Citrus sinensis (L.) Peel Oil

“…Aromatic fruit essential oils play several roles in plant interactions, apart from being crucial allelochemical sources [49] that in uence the germination of different species [50]. It is important to recognize that allelochemicals, contingent on their concentration and the species under examination, can either promote or hinder seed development by modifying numerous metabolic processes linked to germination [51,52].…”