Allelopathy effect of leaves aqueous extracts of Lonchocarpus campestris on the germination and early growth of beggartick
Abstract
Several plant species synthesize substances called allelochemicals, which inhibit the germination and early growth of seedlings. The objective of this study was to evaluate the allelopathic action of aqueous extracts of fresh and dry Lonchocarpus campestris leaves on the germination and early growth of beggartick. The concentrations used were 0; 2; 4 and 8%. The following parameters were evaluated: germination, speed index and germination rate, length of the hypocoyl and radicle, total dry mass, and water content. The germination and speed index were reduced by increasing the concentration of the extract of fresh and dry leaves. The germination rate was reduced at 4% and 8% concentrations of the extract of dry leaves. The length of the radicle was reduced as from 2% concentration of the extract of fresh and dry leaves and the length of the hypocoyl decreased at 8% concentration of the extract of fresh leaves. The total dry mass and water content were similar among plants under different concentrations. Aqueous extracts of Lonchocarpus campestris leaves presented allelopathic effects on the seeds and seedlings of beggartick and the most radical results were caused by the dry leaves extract.
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