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| Registros recuperados: 60 | |
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| Long, Marc; Tallec, Kevin; Soudant, Philippe; Lambert, Christophe; Le Grand, Fabienne; Sarthou, Geraldine; Jolley, Dianne; Hegaret, Helene. |
| Harmful microalgal blooms are a threat to aquatic organisms, ecosystems and human health. Toxic dinoflagellates of the genus Alexandrium are known to produce paralytic shellfish toxins and to release bioactive extracellular compounds (BECs) with potent cytotoxic, hemolytic, ichtyotoxic and allelopathic activity. Negative allelochemical interactions refer to the chemicals that are released by the genus Alexandrium and that induce adverse effects on the physiology of co-occurring protists and predators. Releasing BECs gives the donor a competitive advantage that may help to form dense toxic blooms of phytoplankton. However BECs released by Alexandrium minutum are uncharacterized and it is impossible to quantify them using classical chemical methods.... |
| Tipo: Text |
Palavras-chave: Harmful algal bloom; Alexandrium; Allelopathy; Cytotoxicity; PAM fluorometry; Bioassay. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00453/56424/58116.pdf |
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| FORSTER, R.; SAITO, M.L.; MORICONI, W.. |
| Ação alelopática da leguminosa Canavalia ensiformis (feijão de porco) já é praticada em campo semeado com essa leguminosa. Tentativa de esclarecer o modo de ação, levou a testar as partes, raízes, caules, folhas moídas misturadas a terra, plantando-se em seguida os tubérculos de Cyperus rotundus L. em ambiente de laboratório ou em casa de vegetação. Utilizando copos plásticos com capacidade de 160ml, terra argilosa misturada com quantidades diferentes das partes acima citadas, não revelaram qualquer ação sobre a capacidade de brotação dos tubérculos do Cyperus. Utilizando o mesmo método com vagens secas do feijão de porco, e separadamente com sementes, foi possível observar pequena ação da vagem seca, e pronunciada ação das sementes moídas, observou que... |
| Tipo: Resumo em anais de congresso (ALICE) |
Palavras-chave: Alelopatia; Canavalia ensiformis; Cyperus rotundus; Leguminosa; Tiririca; Planta daninha; Planta invasora; Elemento ativo; Bioensaio; Allelopathy; Leguminosae; Weed; Bioassay; Active agent. |
| Ano: 1995 |
URL: http://www.alice.cnptia.embrapa.br/handle/doc/12420 |
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| Laabir, Mohamed; Grignon-dubois, Micheline; Masseret, Estelle; Rezzonico, Bernadette; Soteras, Giselle; Rouquette, Manuel; Rieuvilleneuve, Fabien; Cecchi, Philippe. |
| The inhibitory effects of crude extracts of Zostera marina L and Zostera noltii Hornemann on the growth of the toxic red tide dinoflagellate Alexandrium catenella were investigated through bio-assays. Methanolic and aqueous extracts were prepared from fresh and detrital leaves of Z. marina and Z. noltii collected in the Thau lagoon and Arcachon bay (France). All the extracts exhibited significant inhibition of A. catenella growth, whatever the species and without the need of continuous addition of extracts. The effective concentrations (EC50) varied in the range 0.036-0.199 g L-1 for Z. noltii and 0.036-0.239 g L-1 for Z. marina. Methanolic extracts prepared from fresh plant tissues were the most potent, with EC50 of 0.036-0.039 and 0.036-0.045 g L-1, for... |
| Tipo: Text |
Palavras-chave: Growth inhibition; Allelopathy; Alexandrium catenella; Zostera marina; Zostera noltii; Phenolics. |
| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00170/28095/26720.pdf |
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| Khaliq,Abdul; Matloob,Amar; Ata Cheema,Zahid; Farooq,Muhammad. |
| Weed suppression is one of the several benefits achieved by soil incorporation of crop residues and such suppression is believed to be allelopathic in nature. The allelopathic potential of different crop residues: viz. sorghum (Sorghum bicolor [L.] Moench), sunflower (Helianthus annuus L.), brassica (Brassica campestris L.) was evaluated in rice (Oryza sativa L.) and jungle rice (Echinochloa colona [L.] Link). Chopped crop residues were soil-incorporated alone and mixed at 6 g kg-1 soil (12 t ha-1) and compared with a control without residues. Soil incorporation of residues substantially delayed germination of jungle rice. The time to start germination, time to 50% emergence, mean emergence time, emergence index, and final germination percentage were all... |
| Tipo: Journal article |
Palavras-chave: Residues; Allelopathy; Sorghum; Sunflower; Brassica; Weed control. |
| Ano: 2011 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392011000300012 |
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| Boiago, Nayara Parisoto; Fortes, Andréa Maria Teixeira; Pilatti, Daiane Maria; Silva, Paulo Sérgio Siberti da. |
| This study aimed to analyse the allelopathic bioactivity of fresh and infused aqueous extracts of Brazilian cherry leaves on the germination of lettuce and the initial development of maize. Brazilian cherry leaves were used to prepare a fresh aqueous extract (200 g L-1) and an infused extract (100 g L-1), which were diluted to concentrations of 0.4, 0.8, 1.2, 1.6 or 2.0% w/v. The variables evaluated in lettuce were the germination rate (GR), germination time index (GTI), germination speed index (GSI) and root length (RL). To determine the effect on the initial development of maize, we measured the shoot (SL) and root (RL) length. The experimental design included a factorial 2 × 5 design (two extracts and five concentrations), in addition to a control... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: 2.03.00.00-0; 2.03.03.00-9 Lactuca sativa; Zea mays; Allelopathy; Allelochemicals; Chemical ecology. Botânica; Fisiologia Vegetal. |
| Ano: 2018 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/40972 |
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| Bashir,Uzma; Javaid,Arshad; Bajwa,Rukhsana. |
| Sunflower (Helianthus annuus L.) is a well known allelopathic plant species. However, Pakistani farmers generally incorporate the sunflower residue in the soil with the aim to enhance soil fertility and organic matter. Field experiments were, therefore, carried out to evaluate the effect of sunflower residue incorporation on growth and yield of rice (Oryza sativa L.) and subsequent wheat (Triticum aestivum L.) crop. For rice crop, there were four treatments viz. control, sunflower residue incorporation (RI), NPK fertilizers, and NPK+RI. Two rice varieties (Basmati Pak and Basmati Super) were cultivated. Incorporation of sunflower residue markedly reduced plant growth and yield in 'Basmati Pak'. There was 34% reduction in yield of this variety due to RI.... |
| Tipo: Journal article |
Palavras-chave: Allelopathy; Genotypic tolerance; Oryza sativa; Helianthus annuus; Triticum aestivum. |
| Ano: 2012 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392012000300004 |
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| Arowosegbe,Sunday; Afolayan,Anthony J. |
| Turnip (Brassica rapa var. rapa L.), beetroot (Beta vulgaris L.) and carrot (Daucus carota L.) are common vegetables in South Africa. The allelopathic potential of aqueous leaf and root extracts of Aloe ferox Mill.- a highly valued medicinal plant- was evaluated against seed germination and seedling growth of the three vegetables in Petri dish experiments. The extracts were tested at concentrations of 2, 4, 6, 8, and 10 mg/mL. Leaf extract concentrations above 4 mg/mL inhibited the germination of all the crops, while the root extract had no significant effect on germination irrespective of concentration. Interestingly, the lowest concentration of leaf extract stimulated root length elongation of beetroot by 31.71%. Other concentrations significantly... |
| Tipo: Journal article |
Palavras-chave: Allelopathy; Aloe ferox; Aqueous extracts; Intercrops; Vegetable crops. |
| Ano: 2012 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602012000400006 |
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| JACOBI, U.S.; FLECK, N.G.. |
| A aveia (avena spp.) e uma das culturas mais importantes do Sul do Brasil durante a estacao hibernal de crescimento. Sabe-se que nela existem agentes alelopaticos, o que torna conviniente o entendimento deste fenomeno na cultura. Neste trabalho, buscou-se realizar uma estimativa do potencial alelopatico com base na analise da fase inicial (estabelecimento) do ciclo de diferentes genotipos de aveia, bem como na avaliacao de seus aleloquimicos. A partir da analise dos dados, verifica-se que os genotipos de aveia apresentam potencial alelopatico, e que UPF 13, UFRGS 9, UFRGS 10 e UFRGS 6 sao os que mostram maior efeito. Po outro lado, UFRGS 12, UFRGS 17, UFRGS 884077 e UFP 12 exibem menor efeito. Os efeitos produzidos pelo aleloquimico escopoletina sao... |
| Tipo: Artigo em periódico indexado (ALICE) |
Palavras-chave: Aveia; Escopoletina; Alelopatia; Allelochemicals; Scopoletin; Allelopathy. |
| Ano: 2000 |
URL: http://www.alice.cnptia.embrapa.br/handle/doc/101251 |
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| Registros recuperados: 60 | |
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