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| Leite,Germano Leão Demolin; Picanço,Marcelo; Guedes,Raul Narciso Carvalho; Ecole,Carvalho Carlos. |
| The objective of this work was to determine the effects of rainfall, temperature, predators, parasitoids, plant age, leaf chemical composition, levels of leaf nitrogen and potassium, besides density of leaf trichomes, on attack intensity of Bemisia tabaci biotype B on the Cucumis sativus. An increase in the number of whitefly adults and nymphs per leaf was observed with plant aging. A higher number of whitefly adults per leaf and eggs cm-2 was verified in the apical part than in the middle and bottom part of the plants canopy. However, the higher number of whitefly nymphs was observed in the mid-part than in the apical and bottom part of the plant canopy. The incidence of whitefly nymphs was negatively affected with foliar nitrogen. Pentacosane and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cucumis sativus; Whitefly; Allelochemicals; Nitrogen; Trichomes. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2006000800005 |
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| TANVEER,A.; SAFDAR,M.E.; FAROOQ,N.; SUDOZAI,M.I.; NADEEM,M.A.; ABBAS,T.. |
| ABSTRACT: The phytotoxic composition of Achyranthes aspera was identified through HPLC, and its herbicidal potential was investigated against two narrow leaf weeds viz., Phalaris minor Retz. and Avena fatua L.; and four broad leaf weeds viz. Lathyrus aphaca L., Vicia sativa L., Convolvolus arvensis L. and Asphodelus tenuifolius L. through bioassays. Weed seeds were grown in the aqueous extracts of various plant parts (roots, leaf, stem, fruit and whole plant) of A. aspera at 5% (w/v) concentration. The extracts of all plant parts caused significant reductions with differential degree in germination percentage and mean germination time. Phalaris minor, A. fatua, L. aphaca, V. sativa and A. tenuifolius completely failed to germinate whereas C. arvensis... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Allelochemicals; Germination bioassay; Natural herbicide; Weeds. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100265 |
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| ZUCARELI,V.; COELHO,E.M.P.; FERNANDES,W.V.; PERES,E.M.; STRACIERI,J.. |
| ABSTRACT: This study aimed to assess the allelopathic potential of the aqueous extract of the shoot of Sorghum bicolor at different phenological stages on seed germination and initial growth of kale (Brassica oleracea var. acephala) seedlings, which is considered a bioindicator species. The experiment was carried out at five development stages of S. bicolor (40, 50, 60, 70, and 80 days after emergence), which was used as aqueous extract at six concentrations (0, 20, 40, 60, 80, and 100%) applied in four replications per treatment in 10 or 50 kale seeds per plot. The percentage of germination, germination rate index, root growth, shoot length, and dry matter of kale seedlings were analyzed in the presence of this extract on different days of collection and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Allelochemicals; Aqueous extract of sorghum; Bioindicator species. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100219 |
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| PEREIRA,S.R.; FONSECA,D.R.; MATIAS,R.; CORRÊA,B.O.; PEDRINHO,D.R.. |
| ABSTRACT: Considering the possibility of a intercropping between exotic and native wood species for Legal Reserve areas restoration, information is needed about the possible interactions (positive or negative) between the involved species. The aim of this study was to determine the allelochemicals classes of aqueous extracts from dried and fresh leaves of torelliodora eucalyptus, as well as to evaluate the allelopathic potential of these extracts in the germination and initial growth of Guazuma ulmifola, a native species from Cerrado. To obtain the aqueous extracts at the concentrations of 25 mg mL-1, 50 mg mL-1, 100 mg mL-1 and 200 mg mL-1, the fresh and dried leaves of the eucalyptus were separately subjected to turbolize, followed by an ultrasound bath... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Allelochemicals; Legal Reserve restoration; Guazuma ulmifolia; Exotic species. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100349 |
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| SILVA, D. C. da; MAUCH, C. R.; COSTA, C. J.; MARIOT, M. P.; AMARANTE, L. do; MARTINS, A. C.. |
| O objetivo deste estudo consiste em avaliar a atividade alelopática de diferentes partes vegetais de Achillea millefolium e Cymbopogon citratus Sobre a germinação e o desenvolvimento inicial de sementes e plântulas de Lactuca sativa. Os tratamentos foram: extratos da folha de capim cidrão (CD folha) e extratos de mil-folhas do caule (MF caule), da flor (MF flor), da folha (MF folha) e da raiz (MF raiz) nas concentrações 0; 15; 30; 45, 60 e 75%. Foram avaliados germinação, primeira contagem de germinação, índice de velocidade de germinação, comprimento de parte aérea e raiz primária, massa fresca e seca total de plântulas. Os extratos de capim cidrão (C. citratus) e mil-folhas (A. millefolium) flor e folha afetaram negativamente a germinação e o... |
| Tipo: Artigo de periódico |
Palavras-chave: Bioherbicide; Alface; Semente; Achillea Millefolium; Cymbopogon spp; Lactuca Sativa; Allelochemicals. |
| Ano: 2021 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1138441 |
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| DUKE, S. O.; CERDEIRA, A. L.; CANTRELL, C. L.; SILVA, F. M.; CORNIANI, N.; VELINI, E. D.; DONEGA, M. A.. |
| The thistles Carduus nutants L. and C. acanthoides L. have both been implicated as allelopathic species. These Eurasian native plants are invasive in the U.S. and other parts of the world, competing well with many native species. Bioassay-guided isolation of phytotoxins from shoots and roots of this plant revealed that a chemical found in the roots, aplotaxene (heptadeca-1,8,11,14-tetrane), to be the most likely candidate as an allelochemical. Contrary to the published work of others, we found that this compound to be moderately phytotoxic. It was also found in relatively large amounts in the roots of both Carduus species, and we found the compound to be exuded by the roots into the soil. |
| Tipo: Separatas |
Palavras-chave: Fitotoxidade.; Alelopatia; Erva daninha.; Carduus nutans; Carduus acanthoides; Allelochemicals. |
| Ano: 2013 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/981690 |
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| CÂNDIDO, A. C. da S.; SCHMIDT, V.; LAURA, V. A.; FACCENDA, O.; HESS, S. C.; SIMIONATTO, E.; PERES, M T. L. P.. |
| RESUMO - (Potencial alelopático da parte aérea de Senna occidentalis (L.) Link (Fabaceae, Caesalpinioideae): Bioensaios em laboratório). A bioatividade das frações semipurifi cadas (hexânica, acetato de etila e etanol-água) do extrato etanólico das partes aérea de S. occidentalis foi avaliada através de ensaios de germinação e de crescimento de Lactuca sativa (alface), Lycopersicon esculentum (tomate), Allium cepa (cebola) e Triticum aestivum (trigo), em laboratório. Foram utilizadas três concentrações (250, 500, 1000 mg L-¹) de cada fração e um controle não tratado, com quatro repetições de 50 sementes. Os bioensaios de germinação revelaram que todas as frações atrasaram a germinação de alface, tomate e cebola, e as frações hexânica e acetato de etila... |
| Tipo: Artigo de periódico |
Palavras-chave: Alelopatia; Alface; Allium Cepa; Cebola; Cromatografia; Erva Daninha; Herbicida; Lactuca Sativa; Lycopersicon Esculentum; Tomate; Trigo; Triticum Aestivum; Allelochemicals; Herbicides; Senna occidentalis; Weeds. |
| Ano: 2010 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/861221 |
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| Reigosa,Manuel; Gomes,Anabele Stefânia; Ferreira,Alfredo Gui; Borghetti,Fabian. |
| In this article, we review allelopathy studies conducted in Brazil or involving plant species that occur in the country. Conceptions and misconceptions associated with allelopathy, as well as some international criteria to be applied in allelopathic research, are presented and discussed. We observed a sharp increase in the number of papers on this subject conducted in Brazil between 1991 and 2010. However, most studies are conducted under laboratory conditions, lack a clear hypothesis or a solid justification, and typically make use of target species that do not co-exist with the donor species under natural conditions. We also found that most studies do not take the additional steps in order to purify and identify the bioactive molecules. We recommend that... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Allelopathy; Allelochemicals; Competition; Interference; Phytotoxicity; Weed control. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062013000400001 |
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| Gomaa,Nasr Hassan; Hassan,Mahmoud Omar; Fahmy,Gamal Mohammad; González,Luís; Hammouda,Ola; Atteya,Atteya Mostafa. |
| We assessed the allelopathic effects of the aqueous extract of Sonchus oleraceus dry shoots on the germination and seedling growth of Trifolium alexandrinum, three weed species (Brassica nigra, Chenopodium murale and Melilotus indicus) and S. oleraceus itself. We assayed four different concentrations of the aqueous extract (w v-1): 1%, 2%, 3% and 4%. To determine whether the effects of the extract were attributable to the presence of allelopathic compounds, its osmotic potential or both, we prepared concentrations of polyethylene glycol (PEG) with osmotic potentials equivalent to those of the aqueous extract. All concentrations of the plant extract completely inhibited the germination and seedling growth of C. murale. The lowest concentration of the plant... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Allelochemicals; Aqueous extract; Bioherbicide; Phytotoxicity. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062014000300014 |
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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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| Registros recuperados: 25 | |
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