Table of Contents
ISRN Agronomy
Volume 2012, Article ID 838767, 6 pages
http://dx.doi.org/10.5402/2012/838767
Research Article

Allelopathic Activity of the Hydrolate and Water Decoction of Brachiaria humidicola (Rendle) Plant Parts on the Germination of Four Tropical Leguminous Species

1Departamento de Química, Universidade Federal Rural do Rio Janeiro (UFRRJ), 23890-000 Seropédica, RJ, Brazil
2Núcleo de Pesquisas em Produtos Naturais, Centro de Ciências da Saúde, Universidade Federal do Rio de Janeiro, Bloco H, 1 Andar, Cidade Universitária, 21941-902 Ilha do Fundão, RJ, Brazil
3Departamento de Fitotecnia, Universidade Federal Rural do Rio Janeiro (UFRRJ), 23890-000 Seropédica, RJ, Brazil
4Departamento de Solos, Universidade Federal Rural do Rio Janeiro (UFRRJ), 23890-000 Seropédica, RJ, Brazil
5Programa de Pós Graduação em Zootecnia, Universidade Federal Rural do Rio Janeiro (UFRRJ), 23890-000 Seropédica, RJ, Brazil

Received 26 June 2012; Accepted 30 July 2012

Academic Editors: O. Merah and H.-L. Xu

Copyright © 2012 Roberta Cristiane Ribeiro et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Knowledge of allelopathic interactions between grasses and legumes can contribute for the successful establishment of mixed tropical pastures in Brazil. The purpose of this work was to evaluate the allelopathic effect of the hydrolate and water decoction of Brachiaria humidicola (Rendle) plant parts (root, shoot, and seeds) on four tropical forage legumes Stylosanthes spp. cv. Campo Grande, Macrotyloma axillare, Calopogonium mucunoides, Desmodium ovalifolium, and on lettuce (Lactuca sativa L.), this last species used as a sensitivity standard in allelopathic bioassays. The results obtained for roots and shoots showed, in the case of hydrolate, the highest inhibitory effect on germination rates of the receiving species, while seed hydrolates had a stimulating effect depending on the legume species. In contrast, water decoction extracts had the highest inhibitory effects on root and seed fraction, and the lowest on the shoot fraction. Regarding the receiving species, germination percentages of M. axillare showed higher tolerance to inhibitory effects of the aqueous extracts of B. humidicola, while D. ovalifolium showed the highest sensitivity.