Mode of Allelochemical Action of Phenolic Compounds

Einhellig, Frank A.

doi:10.1201/9780203492789.ch11

Cited by 86 publications

(93 citation statements)

References 51 publications

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“…Zeng et al 2003. This work presents the first report of allelopathic properties in vitro, displayed by wild rocket extract and by the most active compound, a S -glucopyranosyl thiohydroximate, isolated from fraction H. The molecule is active in the range from approximately 6 Á/2)/10 (4 M, which is in line with the concentration of many allelochemicals (Einhellig 2003), while its concentration in fresh plant tissues can be up to ten times higher.…”

Section: Discussionmentioning

confidence: 57%

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In vitroallelopathic properties of wild rocket (Diplotaxis tenuifoliaDC) extract and of its potential allelochemicalS-glucopyranosyl thiohydroximate

Giordano

Molinaro

Spagnuolo

et al. 2005

Journal of Plant Interactions

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An aqueous extract of wild rocket (Diplotaxis tenuifolia DC) was tested for its allelopathic activity in vitro on radish germination and seedling growth in light and darkness. The extract caused a delay in the onset and a significant decrease in the rate of germination (40%) in the light. The photo-inhibition was accompanied by an inhibition of water uptake into the seed, and a decrease of protein content as well as an increase of peroxidase activity into the seedlings. Microscopic observations suggest that the extract markedly changes radish radicle development inducing a decreased imbibition and distension of seed cells. Consistent results were obtained with some species such as purslane, lambsquarter and tree of heaven present in the cultivated wild rocket field and with cultivated lettuce and barley. Finally, a potential allelochemical, biologically active, was isolated from the extract: S -glucopyranosyl thiohydroximate at concentration of 6.3 )/10 (4 M.

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Section: Discussionmentioning

confidence: 57%

“…Hence, the increase of peroxidase activity observed in radish seeds germinated in wild rocket extract, suggests that peroxidases can contribute to plant defence against potentially toxic compounds (Dowd et al 1997, Einhellig 2003.…”

Section: Discussionmentioning

confidence: 99%

In vitroallelopathic properties of wild rocket (Diplotaxis tenuifoliaDC) extract and of its potential allelochemicalS-glucopyranosyl thiohydroximate

Giordano

Molinaro

Spagnuolo

et al. 2005

Journal of Plant Interactions

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“…46 uinines, anthraquinones and flavonoids. At significant concentrations, phenolic compounds can inhibit the growth of microalgae and other aquatic plant life (Einhellig 2004). The presence of -OH, C=O, C-O, and phenyl peaks in the different extracts of both plants confirms the presence of terpenoids in these macrophytes.…”

Section: Discussionmentioning

confidence: 85%

Interactions of Ipomoea aquatica and Utricularia reflexa with phytoplankton densities in a small water body in northern Nigeria

Chia

Adelanwa

Ladan

et al. 2012

Oceanological and Hydrobiological Studies

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The interactions of Ipomoea aquatica and Utricularia reflexa with phytoplankton densities were studied in a small water body in Zaria, Nigeria from June to November 2007. The negative effects of both macrophytes on 10 out of 15 phytoplankton taxa, including Staurastrum sp., Netrium sp., Ulothrix sp., Marssionella sp. and Closterium sp. were differentiated from other environmental effects. U. reflexa, on the other hand, showed positive associations with species like Actinocyclus sp., Palmellopsis sp., Spirotaenia sp., Microcystis sp. and Marssionella sp. Qualitative phytochemical screening and FT-IR analyses confirmed the

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“…FTIR analysis showed the presence of C-O, C=O, and -OH in the extract which inferred the presence of carboxylic and terpenoid compounds. Terpenoids are made up of several compounds having varied structural diversity and biological activity (Einhellig 2004). The presence of alkaloids in the aqueous extracts may also be implicated for inhibitory effects.…”

Section: Discussionmentioning

confidence: 99%

Algicidal effects of aqueous leaf extracts of neem (Azadirachta indica) on Scenedesmus quadricauda (Turp.) de Brébission

et al. 2016

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The application of synthetic algaecides for the control of algae produces by-products that are sometimes toxic to the environment. There is a need for natural and cheap alternatives to synthetic algaecides. In the present study, we investigated the potential of aqueous crude extract of Azadirachta indica to inhibit the growth of Scenedesmus quadricauda. Phytochemical screening of the extract revealed the presence of groups of bioactive compounds that are capable of inhibiting microalgal growth. Chlorophyll a concentration, dry weight production and cell density of microalga decreased with increasing crude extract concentration. After three days of exposure, the 1000 mg/L extract concentration resulted in complete growth inhibition and cell lysis. Furthermore, the ability of S. quadricauda to form multi-celled coenobial structures was compromised in a concentration dependent manner. In general, catalase and peroxidase activities of the microalga were upregulated with increasing extract concentration. These results imply that aqueous neem extract may provide a cheap and ecofriendly alternative for the control of microalgae in aquatic ecosystems.

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Mode of Allelochemical Action of Phenolic Compounds

Cited by 86 publications

References 51 publications

In vitroallelopathic properties of wild rocket (Diplotaxis tenuifoliaDC) extract and of its potential allelochemicalS-glucopyranosyl thiohydroximate

In vitroallelopathic properties of wild rocket (Diplotaxis tenuifoliaDC) extract and of its potential allelochemicalS-glucopyranosyl thiohydroximate

Interactions of Ipomoea aquatica and Utricularia reflexa with phytoplankton densities in a small water body in northern Nigeria

Algicidal effects of aqueous leaf extracts of neem (Azadirachta indica) on Scenedesmus quadricauda (Turp.) de Brébission

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