Allelopathy Journal (ALLELOPATHY J )

Publisher: International Allelopathy Foundation (Hisar, India)


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    ABSTRACT: The phytotoxic potential of faba bean (Vicia faba L.) was evaluated by both soil-based and aqueous extract laboratory bioassays. A preliminary bioassay was conducted in Petri dishes filled with faba bean-amended soil. The results revealed strong inhibitory effects on the early growth of the model species lettuce. The phytotoxic potential of aqueous extracts of faba bean aerial biomass was then determined on lettuce, maize and soybean as model crops in a temperate forage-based system, and Amaranthus retroflexus (redroot pigweed), Echinochloa crus-galli (barnyard grass) and Digitaria sanguinalis (large crabgrass) as the most common associated weeds. Dose-response curves and IC50 and IC90 values for faba bean aqueous extracts were obtained. The results indicate that faba bean aqueous extracts significantly inhibited the germination and early growth of weeds. Except for the highest concentration, crops were not affected, or crops growth was enhanced by the aqueous extracts at concentrations that suppressed the weeds. Thus faba bean aerial biomass may be a promising material for weed control in sustainable-based crop systems.
    Allelopathy Journal 10/2014; 34:299-314.
  • Allelopathy Journal 01/2014; 33(1):43-52.
  • Allelopathy Journal 01/2014;
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    ABSTRACT: This study determined the chemical contents of dichloromethane bark extract of I. murucoides that inhibited the seed germination in T. recurvata. Dichloromethane bark extract was subjected to two consecutive fractionations. The inhibition (%) of T. recurvata seed germination was determined for each resulting fractions. Using gas chromatography-mass spectrometry (GCMS), the components of primary fraction with the highest inhibition were analyzed, as well as secondary fractions derived from this primary fraction. The primary fraction G (CH2Cl2:AcOEt (v/v 1:1)) had the highest inhibitory effects on T. recurvata seed germination. The secondary fractions G1 (Hex:CH2Cl2 (mean concentration v/v 3:7), G5 [CH2:Cl2:AcOEt (v/v 7:3)] and G7 (MeOH) were most inhibitory. Among the compounds of active primary fraction and secondary fractions G5 and G7, n-hexadecanoic acid were identified as compounds with possible allelopathic activity. However, these were not present in secondary fraction G1, it had the allelochemical 3,7,11,15-tetramethyl-2-hexadecen-1-ol. Results indicated that there were three active secondary fractions with different chemical composition but none of these inhibited the seed germination of T. recurvata. The inhibitory effects of dichloromethane extract of I. murucoides tends to diminish with fractionation, it is possible that the activity of components may be greater when they act together than when they act individually, However, further research is needed in this direction.
    Allelopathy Journal 01/2013; 32(1):91-100.
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    ABSTRACT: Allelopathic effects of Pueraria javanica cover crop grown under oil palm and its litter on control of weeds (Asystasia gangetica and Pennisetum polystachion) in oil palms was explored in laboratory bioassay and potculture. In Lab bioassay, the litter leachates of P. javanica significantly reduced the seed germination (%) and delayed the seed germination of Asystasia gangetica but did not affect the germination (%) and seed germination time of Pennisetum polystachion. Pueraria javanica leachates significantly reduced the radicle lengths of both A. gangetica and P. polystachion seedlings. The inhibitory effect was higher on P. polystachion growth, P. javanica at the highest concentration (50 g L-1) caused 43% reduction in radicle length than 23% reduction in Asystasia gangetica. However in pot culture, the increasing concentrations of P. javanica leachate-amended soils did not affect the root and shoot lengths, dry weight and chlorophyll concentration of A. gangetica and P. polystachion seedlings. The decomposition study of P. javanica in soil showed that the phenolic compounds in P. javanica litter did not remain stable in soil for > 6 weeks. The allelopathic effects of P. javanica litter on germination depended on weed species, but P. javanica litter did not interfere with seedling growth of test weed species. The allelopathic activity did not persist for long periods of time in soil.
    Allelopathy Journal 01/2013; 32(2):191-*202.