Atividade alelopática de extrato acetato-etílico de folhas de Solanum cernuum Vell

Abstract

The aim of this study was to evaluate the allelopathic action of an ethyl-acetate extract of the leaves of Solanum cernuum Vell (Solanaceae) relative to the inhibitory effect on seed germination and seedling vigour in Sorghum bicolor L. (sorghum), Lactuca sativa L. (lettuce) and Bidens pilosa L. (Spanish needle). The phytotoxic activity of the ethyl acetate extract was evaluated at concentration s of 0.00; 31.25; 62.50; 125.00; 250.00; 500.00; 750.00 and 1000.00 mg L -1 . The variables analyzed were: percentage of germination; germination speed index; length of shoot and root; and seedling dry weight. The results showed a phytotoxic effect for the ethyl acetate extract of S. cernuum on sorghum, lettuce and Spanish needle for at least one of the variables analysed. For Spanish needle, all the variables except dry mass suffered significant reductions (p<0.05). There are phytotoxic effects for the ethyl acetate extract of Solanum cernuum Vell on seed germination and seedling vigour in sorghum, lettuce and Spanish needle. From the species studied, Spanish needle is the most sensitive, with a 69% reduction in shoot length and an 88% reduction in root length in the presence of the extract of S. cernuum at 100mg L -1 .