Inhibitory effects of hydroalcoholic extracts of five plant species used as mulches on germination of lettuce and carrot seeds

摘要

Studies were undertaken to evaluate the inhibitory activity of hydroalcoholic extracts from dry mass of plant species used as mulches: Melinis minutiflora, Hyparrhenia rufa, Panicum maximum, Mucuna aterrima and bamboo leaves (Bambuza spp.). The inhibitory activity was measured on germination tests of lettuce and carrot seeds. Five extract concentrations of each species were used: 0, 25, 50, 75 and 100 % (v/v). The rate of speed germination and percentage of germination of both species decreased significatly in function of the extract concentrations in the range from 50 to 100 % (v/v). Mucuna aterrima extract was significatly more inibitory than the other extracts, mainly for lettuce seeds. Bioassays with extracts showed the presence of several groups of alleopathic compounds.