Variação sazonal na alelopatia de extratos aquosos de Coleus barbatus (A.) Benth. sobre a germinação e o desenvolvimento de Lactuca sativa L.

Pelegrini, Luciana Luiza; Cruz-Silva, Claudia Tatiana Araujo da

doi:10.1590/s1516-05722012000200019

Cited by 8 publications

(5 citation statements)

References 8 publications

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“…Peres et al (2010) discuss that stimulatory or inhibitory effects may be caused by different concentrations. Fluctuation between stimulatory and inhibitory responses, depending on the extraction methods and the extract concentration, has also been observed by Pelegrini and Cruz-Silva (2012) in Coleus barbatus (A.) Benth extracts, and by Viecelli and Cruz-Silva (2009) in Salvia officinalis L. extracts.…”

Section: Resultsmentioning

confidence: 90%

Allelopathic bioactivity of fresh and infused aqueous extracts of Brazilian cherry (Eugenia uniflora L.) on lettuce and maize

Boiago

Fortes

Pilatti

et al. 2018

Acta Sci. Biol. Sci.

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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 treatment (no extract). In general, the allelopathic bioactivity differed between the fresh and infused extracts. The fresh extract was more phytotoxic for the GR and RL of lettuce. Some beneficial results were observed for the infused extract, including an increase in the RL of lettuce and SL of maize. These effects were dependent on the extract concentration. Thus, there is evidence that Brazilian cherry extracts have allelopathic bioactivity.

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Section: Resultsmentioning

confidence: 90%

Allelopathic bioactivity of fresh and infused aqueous extracts of Brazilian cherry (Eugenia uniflora L.) on lettuce and maize

Boiago

Fortes

Pilatti

et al. 2018

Acta Sci. Biol. Sci.

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“…Rezende et al 2004 Souza et al (2007), estudando a espécie Schinus terebinthifolius na germinação de sementes de alface verificou que o extrato na concentração de 100% interferiu significativamente na porcentagem de germinação, apresentando efeito alelopático. Ribeiro et al (2009), também encontraram resultados semelhantes quando utilizaram extratos aquosos de Crinum americanum na embebição de sementes de alface.…”

Section: Resultsunclassified

“…Fato semelhante também aconteceu com a embebição das sementes de alface em extratos de Crinum americanum, que também proporcionou aumento da velocidade de germinação com o aumento da concentração (RIBEIRO et al, 2009). Porém, Barreiro et al (2005) Ao se utilizar o extrato de folhas secas de P. echinata a velocidade de germinação das sementes de alface foi de 2,24 (controle), 5,1 (100%), 4,35 (75%), 4,42 (50%) e 2,9 (25%), respectivamente.…”

Section: Resultsunclassified

Allelopathy of aqueous extracts of Paubrasilia echinata (Lam.) Gagnon and H.C. Lima and G.P Lewis in lettuce seed germination

Albuquerque

Paz

Machado

2020

RAmb.

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O pau-brasil é uma espécie nativa ameaçada de extinção com potencial para uso em programas de reflorestamento, porém, há pouca informação sobre seu efeito alelopático na germinação de sementes de outras espécies. Sendo assim, objetivou-se com esse trabalho avaliar o efeito alelopático de extratos aquosos de Paubrasilia echinata L. na germinação de sementes de alface, visando a sua utilização em programas de reflorestamento. Amostras de folhas frescas e secas foram trituradas em liquidificador, acrescentando-se, posteriormente, 400 mL de água destilada e, após 10 minutos, as soluções foram filtradas. A partir desses extratos brutos, foram feitas diluições em água destilada e obteve-se os seguintes tratamentos: 0%, 25%, 50% , 75% e 100% dos extratos de folhas frescas e secas. Foi feito o teste de germinação das sementes de alface embebidas nos extratos, seguindo as recomendações das Regras para Análise de Sementes (RAS) (BRASIL, 2009). Foi feita a contagem diária, avaliando-se o índice de velocidade de germinação (MAGUIRE, 1962), a velocidade de germinação (EDMOND; DRAPALLA, 1958 apud FERREIRA; BORGUETTI, 2004) e a porcentagem de germinação, sendo consideradas germinadas as sementes com 2 mm de comprimento de radícula. As análises estatísticas foram realizadas usando o programa GRAPHPAD PRISM. Concluiu-se que P. echinata exerce efeito alelopático na germinação de sementes de alface. O uso de P. echinata em programas de reflorestamento deve ser criterioso, com a adoção de medidas que minimizem a alelopatia em plantas circunvizinhas.

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“…At the same time that weeds release allelochemicals in the environment, they are also subject to the action of other allelochemicals of other plants. It is known that all plant organs can produce allelochemicals (Weston, 1996;Pelegrini and Cruz-Silva, 2012), which are released into the environment in various forms: volatiles, leachate, root exudation, and decomposition (Rice, 1984;Chou, 1992;Weir et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Phytotoxic Potential of the Crude Extract and Leaf Fractions of Machaerium hirtum on the Initial Growth of Euphorbia heterophylla And Ipomoea grandifolia

et al. 2019

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Allelopathy is the term used to define any process involving secondary metabolites produced by plants and microorganisms that influence growth and development of agrobiological systems. Currently, it is sought to find allelochemicals of interest and know how to apply them in bio-herbicides to combat weeds. In this study, the effects of the crude leaf extract and fractions of Machaerium hirtum (Vell.) Stellfeld were analyzed on Euphorbia heterophylla L. (wild poinsettia) and Ipomoea grandifolia (Dammer) O’Donell (morning glory), as well as the occurrence of morphoanatomical changes. For this, 0.04 g of the crude extract and fractions were solubilized and diluted (50 mL) to concentrations of 0.1, 0.2, 0.4, and 0.8 g L-1 (m/v). Initial growth tests were performed on Petri dishes containing two paper sheets and seedlings of weed species with the respective treatments, being maintained in a germination chamber for 48 hours at 25 oC. Distilled water was used as a control. Shoot and root length was assessed in the initial growth. The percentage of inhibition was calculated based on the values obtained in the initial growth bioassays. Morphologically altered wild poinsettia seedlings were fixed and sectioned transversely for anatomical analysis. The results indicated significant changes in length, being wild poinsettia seedlings more sensitive when compared to those of morning glory. Morphologically altered seedlings presented root necrosis as the most frequent symptom. Anatomically, parenchymatic cells of the hypocotyl and roots of wild poinsettia seedlings presented smaller and irregularly shaped cells when compared to the control, causing significant reductions in the measured parameters.

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Variação sazonal na alelopatia de extratos aquosos de Coleus barbatus (A.) Benth. sobre a germinação e o desenvolvimento de Lactuca sativa L.

Cited by 8 publications

References 8 publications

<b>Allelopathic bioactivity of fresh and infused aqueous extracts of Brazilian cherry (<i>Eugenia uniflora</i> L.) on lettuce and maize

<b>Allelopathic bioactivity of fresh and infused aqueous extracts of Brazilian cherry (<i>Eugenia uniflora</i> L.) on lettuce and maize

Allelopathy of aqueous extracts of Paubrasilia echinata (Lam.) Gagnon and H.C. Lima and G.P Lewis in lettuce seed germination

Phytotoxic Potential of the Crude Extract and Leaf Fractions of Machaerium hirtum on the Initial Growth of Euphorbia heterophylla And Ipomoea grandifolia

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