In the search for a standard bioassay of phytotoxicity allelochemicals, 22 commercial varieties eight plant species [four dicotyledons: lettuce (Compositae), carrot (Umbelliferae), cress (Cruciferae), tomato (Solanaceae); and four monocotyledons: onion (Liliaceae), barley, wheat, corn (Gramineae)] proposed as models most common weed families have been tested at different pH solution volumes per set conditions. Nine selected target (STS) were with herbicides to ensure their sensitivity...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural Elucidation and Chemistry of a Novel Family Bioactive Sesquiterpenes: HeliannuolsFrancisco A. Macias, Jose M. G. Molinillo, Rosa Varela, Ascension Torres, Frank R. FronczekCite this: J. Org. Chem. 1994, 59, 26, 8261–8266Publication Date (Print):December 1, 1994Publication History Published online1 May 2002Published inissue 1 December 1994https://pubs.acs.org/doi/10.1021/jo00105a052https://doi.org/10.1021/jo00105a052research-articleACS...

Benzoxazinoids have been described as important allelochemicals from Gramineae well Acanthaceae, Rannunculaceae, and Scrophulariaceae plants. Several bioactivities evaluated for these compounds, including fungistatic, antifeedant, phytotoxic. In ongoing studies about natural herbicide models, the description of soil dynamics in phytotoxic agents has high importance, because possible biotransformations developed by microorganisms could yield compounds with modified biological properties,...

The phytotoxicities of a selection eudesmanolides and guaianolides, including natural products new derivatives obtained by semisynthesis from plant-isolated sesquiterpene lactones, were evaluated in bioassays against three weeds concern agriculture (Amaranthus viridis L., Echinochloa crus-galli Lolium perenne L.). Both guaianolides active the root shoot growth all species, with generally showing improved activities. IC50 values for herbicide employed as positive control (on growth,...

Benzoxazinones 2,4-dihydroxy-7-methoxy-(2H)-1,4-benzoxazin-3(4H)-one (DIMBOA) and 2,4-dihydroxy-(2H)-1,4-benzoxazin-3(4H)-one (DIBOA) have been considered key compounds for understanding allelopathic phenomena in Gramineae crop plants such as corn (Zea mays L.), wheat (Triticum aestivum rye (Secale cereale L.). The degradation processes the environment observed these compounds, which soil microbes are directly involved, could affect potential activity of plants. We present this work a...

We describe a synthetic approach for two families of compounds, the capsaicinoids and capsinoids, as part study quantitative relationship between structure activity. A total 14 increasing lateral chain lengths, from 2 to 16 carbon atoms, were synthesized. In addition, capsinoids with identical chains, well capsiate dihydrocapsiate, have been synthesized, new method synthesis these compounds has developed. The yields range 48.35 98.98%. It found that present lipophilia similar those natural...

Cardoon (Cynara cardunculus L.) is a native plant to the Iberian Peninsula and European Atlantic coast invasive in American environments. Different solvents were used perform cardoon extracts that tested phytotoxic bioassays. The ethyl acetate extract had highest inhibitory activity so this was on germination growth of standard target species (lettuce, watercress, tomato, onion) weeds (barnyardgrass brachiaria). very active root both it therefore fractionated by chromatography. spectroscopic...

Abstract Guaianolides constitute a large and diverse group of biologically active sesquiterpenes. Guaianolide seco ‐guaianolides can also be used as, for example, scaffolds the development new molecules that are readily accessible by synthetic methods. Nevertheless, these lactones often have complex structures make their synthesis difficult. The aim this microreview is to provide an overview developments in guaianolide two major strategies: semi‐synthesis total synthesis. Partial syntheses...

Allelopathy is a biological phenomenon in which an organism produces one or more biochemicals that influence the growth, survival, and reproduction of other organisms. has been subject great deal research chemical ecology since 1930s. The characterization factors this barely explored, mainly due to complexity area. main aim carried out date shed light on importance these interactions agroecosystems, especially relation between crops weeds. Herein we report complete allelochemical pathway...

Tithonia diversifolia (Mexican sunflower) is a dominant plant of the Asteraceae family, which suggests it produces allelochemicals that interfere with development surrounding plants. The study described herein was conducted to identify compounds have phytotoxic activity in T. extracts. Ethyl acetate extracts leaves, stems, and roots showed significant inhibition wheat coleoptile growth, leaf extract had similar inhibitory effects commercial herbicide. Fourteen compounds, 12 were...

Natural products involved in plant-plant and plant-microorganism ecological interaction (Allelochemicals) are an important potential source for alternative agrochemicals pharmaceuticals, order to solve the many problems derived from inadequate culture practices abuse of synthetic herbicides. Isolation, structural determination, bioassay techniques applicability these compounds crop protection pharmaceutical research discussed, future trends on Allelochemicals applications examined. The new...

Wheat (Triticum aestivum L.) has been found to possess allelopathic potential and studies have conduced apply wheat allelopathy for biological weed control. 2,4-Dihydroxy-(2H)-1,4-benzoxazin-3(4H)-one (DIBOA) is a common product in wheat, corn, rye exudates it can be released the environment by that way. In this report, stability of DIBOA studied two soils from crop lands cv. Astron Ritmo. These varieties were selected their concentrations...

Compounds with a (2H)-1,4-benzoxazin-3(4H)-one skeleton have attracted the attention of phytochemistry researchers since 2,4-dihydroxy-(2H)-1,4-benzoxazin-3(4H)-one (DIBOA) and 2,4-dihydroxy-7-methoxy-(2H)-1,4-benzoxazin-3(4H)-one (DIMBOA) were isolated from plants belonging to Poaceae family. These compounds exhibit interesting biological properties, such as phytotoxic, antimicrobial, antifeedant, antifungal, insecticidal properties. chemicals, in addition wide variety related involved...