01873naa a2200253 a 450000100080000000500110000800800410001910000210006024500900008126000090017152011660018065000200134665000160136665000160138270000210139870000160141970000260143570000200146170000210148170000180150270000180152070000250153877300560156315783662022-06-08       2005    bl uuuu     u00u1 u    #d1 aARRUDA, M. S. P.  aPotential allelochemicals isolated from Pueraria phaseoloides.h[electronic resource]  c2005  aTwo pyranoisotlavones, alpinumisoflavone and 4' -rnethyl-alpinumisoflavone and methyl 2-([3-D-glucopyranosyloxy) benzoatc were isolated trom the aerial parts of Pueraria phaseoloides. Phytotoxic effects of these compounds and of the P. phaseoloides hydroalcoholic extract fractions obtained by liquid-liquid partition were examined in Petri dish bioassay. The dichloromethanic and ethyl acetate tractions had a significant effect 011 seed germination of the weed species Mimosa pudim, showing 100 and 76 % inhibition, respectively. However, the three isolated compounds had a greater effect on radicle elongation of the weed species Mimosa pudim. Senna obtusifolia, Senna occidentalis and Urena lobata. 4'-Methylalpinumisoflavone at the highest dose tested (3.0 ppm) exhibited stronger inhibition (77 %) on S. obtusifolia, whereas, alpinumisotlavone at 3.0 ppm was more active (60% inhibition) on U. lobata and methyl 2-([3-D-glucopyranosyloxy) benzo ate at 4.0 ppm (the highest dose tested) showed significam inhibition (44 %) on M. pudim. Our experimental data showed that three natural products tested have selective herbicidal activity against weed species.  aallelochemicals  aallelopathy  aLeguminosae1 aARAUJO, M. Q. de1 aLOBO, L. T.1 aSOUZA FILHO, A. P. de1 aALVES, S. de M.1 aSANTOS, L. da S.1 aMULLER, A. H.1 aARRUDA, A. C.1 aGUILHON, G. M. S. P.  tAllelopathy Journalgv. 15, n. 2, p. 211-220, 2005.