Efeitos alelopáticos de extratos aquosos de Crinum americanum L.

Ribeiro, Jose Pedro Nepomuceno; Matsumoto, Reginaldo Sadao; Takao, Leandro Kenji; Voltarelli, Valquíria M.; Lima, Matheus P.

doi:10.1590/s0100-84042009000100018

Cited by 28 publications

(26 citation statements)

References 13 publications

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“…Since leaves are the most active plant part, metabolically speaking, it is reasonable that they have greater diversity of allelochemicals and, hence, greater allelopathic effect (Ribeiro et al, 2009). Previous studies have shown greater amount of allelochemicals on the leaves of tough lovegrass (Favaretto et al, 2015), which could explain both a greater heterotoxic or autotoxic effect of this organ.…”

Section: Shoot Growth (% Inhibition)mentioning

confidence: 99%

AUTOTOXICITY IN TOUGH LOVEGRASS ( Eragrostis plana )

2017

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ISSN 0100-8358 (print) 1806-9681 (online) AUTOTOXICITY IN TOUGH LOVEGRASS (Eragrostis plana) Autotoxicidade em Capim-annoni (Eragrostis plana)ABSTRACT -Autotoxicity in tough lovegrass has been analyzed in the field, but has never been tested in allelopathy bioassays. Therefore, this study aimed to verify and compare the autotoxicity of leaves and roots from aqueous extracts of tough lovegrass on its germination and early seedling growth. Extracts of green leaves (GL), senescent leaves (SL), and roots (R) at concentrations of 0.05, 0.15, and 0.25 g mL -1 were analyzed on how they affected seed germination and seedling growth. The extracts, regardless of the source or concentration of the material used, have significantly reduced germination percentage, index of germination speed, and root growth of seedlings of tough lovegrass. Effects on mean germination time and shoot length varied according to the origin and concentration of the extracts. GL, at concentrations 0.15 and 0.25 g mL -1 , showed the most damaging effect. In tough lovegrass, autotoxicity is a mechanism that may be involved in the control of germination and plant growth, which could explain the distance between their clumps in the field.Keywords: allelopathy, aqueous extracts, Eragrostis plana, germination. RESUMO -A autotoxicidade no capim-annoni é observada no campo, mas nunca

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Section: Shoot Growth (% Inhibition)mentioning

confidence: 99%

AUTOTOXICITY IN TOUGH LOVEGRASS ( Eragrostis plana )

2017

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“…It seems to be a consensus that the leaf is the organ that contains the greatest diversity of allelochemicals, for it is the most metabolically active organ (Ribeiro et al, 2009). Furthermore, the higher dry matter and/or stems production could cause the dilution effect of chemical compounds.…”

Section: Resultsmentioning

confidence: 99%

Allelopathy and Allelochemicals of Eragrostis plana (Poaceae) and its Relation with Phenology and Nitrogen Fertilization

et al. 2017

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-This study was conducted in order to verify if the phenological stage and the nitrogen fertilization interfere in the allelopathic activity and in the concentration of potentially allelopathic phenolic compounds of tough lovegrass (Eragrostis plana). The assay consisted of a bifactor 3 (0.100 and 200 kg N ha -1 ) x 2 (harvested in vegetative and reproductive stages), in a split plot design. The N doses constituted the main plot and the phenological stage during the harvest the subplots, resulting in six treatments. The tough lovegrass plants derived from each of the treatments were subjected to allelopathy bioassays, in which aqueous extracts of the aerial parts were applied to lettuce cypselae (Lactuca sativa) and to phytochemicals tests when ethanolic extracts were used, with subsequent partition with ethyl acetate, followed by a high-performance liquid chromatography analysis. There was nitrogen x phenological stage interaction on biological and chemical attributes. The allelopathic extracts were, in descending order of inhibition of germination, those from plants harvested at the vegetative stage and fertilized with 100 kg N and at the flowering stage with 200 kg N, which showed the highest catechin concentrations. The caffeic, ferulic, p-coumaric and vanillic acids were in a higher concentration in flowered and fertilized plants with 0 or 200 kg N. The management of the nitrogen fertilization and the harvesting age influence the allelopathic activity and the phytochemical composition of tough lovegrass.Keywords: germinability, phenolic acids, catechin, epicatechin. RESUMO -Este estudo foi realizado com o objetivo de verificar se a fenologia e a adubação nitrogenada interferem na atividade alelopática e na composição fenólica do capim-annoni (Eragrostis plana

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“…Utilizou-se essa proporção por ela ser a mais concentrada que o agitador era capaz homogeneizar. Água foi usada como solvente porque experimentos preliminares (RIBEIRO et al, 2009) demonstraram ser o mais eficiente para extrair os aleloquímicos dessa espécie. Durante 6 horas foram retiradas alíquotas de 200 ml a cada hora, que foram filtradas em papel filtro.…”

Section: Methodsunclassified

“…Crinum americanum L. (Amaryllidaceae ) possui potencial alelopático, inibindo em laboratório espécies olerícolas e plantas daninhas de culturas (RIBEIRO et al, 2009). Ainda segundo os autores, C. americanum é uma espécies rústica, de crescimento rápido e simples de ser cultivada, o que a coloca com possibilidade de planta doadora para o desenvolvimento de herbicidas naturais em escala comercial.…”

Section: Introductionunclassified

Potencial alelopático de Crinum americanum L. sob diferentes condições de extração

Ribeiro

Lima

2011

Sem. Ci. Agr.

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ResumoO uso prolongado torna os herbicidas tradicionais cada vez menos eficientes no combate às plantas daninhas. O uso de substâncias naturais extraídas das plantas é uma alternativa eficiente e menos agressiva ao meio ambiente. Os aleloquímicos de muitas espécies são possíveis matérias primas para o desenvolvimento de herbicidas orgânicos. Um dos principais problemas encontrados para a produção desses herbicidas é a obtenção de material botânico em quantidade comercial. Melhorar as técnicas de extração é um passo importante, uma vez que reduz a quantidade de matéria prima necessária. The long-term use reduces the efficiency of the traditional herbicides. The use of plant-extracted natural substances is an alternative more efficient and less aggressive to the environment. The allelochemicals of several species are considered to be possible plants for developing an organic herbicide. One of the major problems in this sense is obtaining botanical material in commercial quantities. Improving the extraction techniques is an important step, once it reduces the amount of botanical material needed. In this survey was tested several methods of aqueous extractions of dried leaves of Crinum americanum L., an Amaryllidaceae with strong allelopathic properties. The time of extraction is not important for the allelopathic potential of the extracts. On the other hand, when the temperature during extraction was 40 e 60 o C, leaded to extracts with stronger allelopathic potential. It is possible to improve the allelopathic potential using the filtered matter more than once. Key words: Extractions. Allelochemics. Natural Herbicide. Temperature. AbstractRecebido para publicação 19

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Efeitos alelopáticos de extratos aquosos de Crinum americanum L.

Cited by 28 publications

References 13 publications

AUTOTOXICITY IN TOUGH LOVEGRASS ( Eragrostis plana )

AUTOTOXICITY IN TOUGH LOVEGRASS ( Eragrostis plana )

Allelopathy and Allelochemicals of Eragrostis plana (Poaceae) and its Relation with Phenology and Nitrogen Fertilization

Potencial alelopático de Crinum americanum L. sob diferentes condições de extração

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