Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 27 for “"Allelochemicals"”.
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Action of Allelochemicals on Algal Growth and Photosystem Ii Efficiency
The action of 15 allelochemicals from 7 chemical classes was tested on unicellular algal growth and photosystem II (PSII) efficiency. Chlorella pyrenoidosa Chick and Selenastrum capricornutum Printz were the bioassay species. Fourteen of the 15 allelochemicals investigated resulted in a significant …
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Ecological Aspects of Insect Detoxication Enzymes and Their Interaction With Plant Allelochemicals
Inhibition of insect mixed-function oxidases (MFOs) by phytosynergists (plant compounds that synergize cooccurring toxins), differences in MFO activity and sensitivity to phytosynergists among insect species, and metabolic costs of MFO induction are investigated in a series of experiments.
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Effects of furocoumarin and furoquinoline allelochemicals on host plant utilization by Papilionidae
… and Papilio cresphontes, ingested the two allelochemicals without detrimental effect while the representative Troidini, Battus philenor, experienced reduced consumption and survival, and the representative Graphiini, Eurytides marcellus, suffered symptoms of complete toxicity. Since the …
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Allelopathy and autotoxicity studies and allelochemicals isolation and identification of alfalfa (Medicago sativa L.)
Greenhouse and laboratory studies were conducted to determine short-term and long-term autotoxicity, and allelopathy using alfalfa, grasses, vetch, and weeds. The allelopathic effects of exudates from alfalfa plant parts and the soil in which alfalfa had been grown on alfalfa germination and …
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Interactions between cover crop residue and microbial community affect weed suppression
… systems. The cover crop residue-associated allelochemicals can inhibit weed germination, growth and production. Soil microbial communities are especially important for the allelochemical potential of a cover crop residue, because microorganisms can modify residues and allelochemicals to make …
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Functional characterization and expression of molluscan detoxification enzymes and transporters involved in dietary allelochemical resistance
… deal with potentially toxic or fitness-reducing allelochemicals is important for understanding patterns of predation and herbivory in the marine environment. The ability of marine consumers to tolerate dietary toxins may involve biochemical resistance mechanisms, which increase the hydrophilicity …
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Factors possibly inhibiting growth of herbaceous plants in the understories of Eucalyptus cinerea
… Eucalyptus species has been attributed to allelochemicals produced by these trees, it is possible that suppression is due to other factors rather than toxicity of soil beneath Eucalyptus stands. The effects of plant competition for light, water and nutrients cannot totally be ignored when …
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Adaptations to Furanocoumarins of Pastinaca Sativa by Depressaria Pastinacella (Lepidoptera: Oecophoridae)
… concentrated in the floral parts. Despite these allelochemicals, the parsnip webworm, Depressaria pastinacella (Lepidoptera: Oecophoridae), feeds almost exclusively on the floral parts of this plant and of certain other umbellifers containing furanocoumarins. The allocation patterns of the …
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Functional characterization and expression of molluscan detoxification enzymes and transporters involved in dietary allelochemical resistance
… deal with potentially toxic or fitness-reducing allelochemicals is important for understanding patterns of predation and herbivory in the marine environment. The ability of marine consumers to tolerate dietary toxins may involve biochemical resistance mechanisms, which increase the hydrophilicity …
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Allelopathic effect of imperata cylindrica (L.) beauv. extracts on the germination of weeds
… the extracts of Imperata cylindrica may contain allelochemicals which may contribute to its invasiveness and extreme competitiveness. While the gas chromatography-mass spectroscopy analysis (GC�MS) of active fractions revealed the presence of allelochemicals including phenolic acid, fatty acids, …
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Molecular Definition of Cytochrome P450 -Mediated Multiple Resistance in Helicoverpa Zea
… to metabolize six biosynthetically diverse plant allelochemicals (xanthotoxin, quercetin, flavone, chlorogenic acid, indole-3-carbinol, and rutin) and three insecticides (diazinon, cypermethrin and aldrin), whereas CYP6B1 metabolizes only two of these allelochemicals (xanthotoxin and flavone) and …
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EXPLORATIONS IN MEDIUM-RING ETHER SYNTHESIS VIA UMPOLUNG HETEROATOM ACTIVATION: TOTAL SYNTHESIS, METHODS DEVELOPMENT, AND REAGENT SYNTHESIS
… Heliannuols are a family of structurally diverse allelochemicals produced by the common sunflower which hold potential as environmentally benign herbicides; however, their further study and development has been hampered by lack of efficient and divergent synthetic strategies. Key challenges …
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Investigating the evolution of cytochromes P450 involved in GA biosynthesis
… natural products as antibiotic phytoalexins or allelochemicals. While rice contains several kaurene oxidase homologs, only OsKO2 (CYP701A6) is required for gibberellin biosynthesis. Here, we demonstrate that the KO from Arabidopsis thaliana (CYP701A3 or AtKO) exhibits significantly greater …
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Variation in chemical components of aquacultured Ulva (Chlorophyta) in response to environmental variables
… in seawater and act as either pheromones or allelochemicals. Aldehydes have been reported to be the main group of volatile compounds in green algae Ulva. Cultivation of Ulva as feed on abalone farms in South Africa has been a success but there has been little research on the chemistry of …
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ARBUSCULAR MYCORRHIZAL RESPONSES TO BIOCHARS IN SOILS - POTENTIAL MECHANISMS OF INTERACTION AND OBSERVED RESPONSES IN CONTROLLED ENVIRONMENTS
… signaling interference and detoxification of allelochemicals; and d) provision of refugia from fungal grazers. Through this overview, a roadmap for research is provided, which is aimed at testing these mechanistic hypotheses. Using this proposed framework as a template, three experiments were …
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ARBUSCULAR MYCORRHIZAL RESPONSES TO BIOCHARS IN SOILS - POTENTIAL MECHANISMS OF INTERACTION AND OBSERVED RESPONSES IN CONTROLLED ENVIRONMENTS
… signaling interference and detoxification of allelochemicals; and d) provision of refugia from fungal grazers. Through this overview, a roadmap for research is provided, which is aimed at testing these mechanistic hypotheses. Using this proposed framework as a template, three experiments were …
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Effects of Nutrients and Minerals on Growth and Detoxification in Phytophagous Insects
… thereby altering susceptibility to host plant allelochemicals. In this study I examined the influence of antioxidant vitamins, minerals, and compounds that affect mineral bioavailability on performance and detoxification in phytophagous insects exposed to prooxidant secondary chemicals. In …
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Exploring Chemically Mediated Interactions Between Spotted Lanternfly, Lycorma delicatula, and Its Host Plants in the Mid-Atlantic Region of the United States
… IV develops a host-free liquid-diet to deliver allelochemicals such as ailanthone. Third and fourth instar nymphs survived longer on a mixed-sugar diet than on a sucrose diet with amino acids and vitamins. Administration of ailanthone increased third-instar consumption without affecting …
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Optimization of Growth Parameters for Algal Regrowth Potential Experiments
… controls. This signified the possible release of allelochemicals by the <em>Chlorella sp.</em>. A preliminary investigation into the possible use of anaerobic digester effluent as a primary source of nutrients for algal cultures was also conducted. The digestate (diluted 50% v/v with a saline …
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Optimización de bioensayos alelopaticos: aplicación en la búsqueda de herbicidas naturales
… work with a permanent mind on applied aspects of allelochemicals in agriculture. This quality is too rare in science not to mention it. For instance, he developed a method allowing searching for biological activity of chemicals, he built a new tool to allow scientists to perform better morphology …
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