Alelopatia de extratos voláteis na germinação de sementes e no comprimento da raiz de alface

Alves, M. da C. S.; Filho, Sebastião Medeiros; Innecco, Renato; Torres, Salvador Barros

doi:10.1590/s0100-204x2004001100005

Cited by 93 publications

(81 citation statements)

References 4 publications

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“…Most allelopathic surveys with essential oils use emulsions of the oils in their assays. Furthermore, the target species varies (Alves et al 2004;Liu et al 2008) and thus, it is diffi cult to compare our results with others. Nevertheless, contact with the oil vapor inhibited E. heterophylla and Ipomoea grandifolia, which suggests that the orange peel essential oil has high inhibitory eff ects.…”

Section: Discussionmentioning

confidence: 96%

Allelopathic effects of orange (Citrus sinensis L.) peel essential oil

Ribeiro

Lima

2012

Acta Bot. Bras.

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Allelopathic eff ects of orange (Citrus sinensis L.) peel essential oil RESUMO (Efeitos alelopáticos do óleo essencial da casca da laranja (Citrus sinensis L.)). Plantas daninhas são o principal problema da agricultura no mundo, causando anualmente um prejuízo de U$95 bilhões. A principal forma de combate às plantas daninhas são os herbicidas sintéticos. Entretanto, o uso continuado desses produtos encarece a produção, reduz a qualidade dos alimentos, deixa resíduos tóxicos no ambiente e ameaça a saúde humana e animal. Existe assim, uma demanda por técnicas menos agressivas de controle. O uso de compostos alelopáticos de descartes de culturas para esse fi m é uma alternativa. A laranja é uma das maiores culturas do mundo, e gera grandes quantidades de resíduos. Existem evidências da bioatividade no óleo essencial da casca da laranja. Nesse trabalho, nosso objetivo foi verifi car a existência de propriedades alelopáticas desse óleo. Para isto, extraímos o óleo por arraste de vapor de água utilizando o aparelho de Clevenger, e colocamos os produtos volatilizáveis do óleo essencial em contato com plântulas de Euphorbia heterophylla L. e Ipomoea grandifolia (Dammer) O'Donell. O resultado foi inibição tanto quantitativa quanto qualitativa das plântulas Palavras-chave: agricultura orgânica, alelopatia, controle de pragas, descartes de cultivos, Limoneno, plantas invasoras de culturas Jose Pedro Nepomuceno Ribeiro 1,2 and Maria Inês Salgueiro Lima 1 ABSTRACT (Allelopathic eff ects of orange (Citrus sinensis L.) peel essential oil). Crop weeds are the main problem in agriculture, causing a worldwide annual loss of about US$95 billion. Th e principal method for control is the use of synthetic herbicides. Th e continued use of these products increases crop costs, reduces crop quality, and leaves toxic residues in the environment, which are a threat to human and livestock health. Th erefore, there is a demand for environmentally friendly methods of weed control. Th e use of allelopathic compounds from crop residues is an alternative. Orange is one of the biggest crops in the world, and its cultivation generates large amounts of residues. Th ere is strong evidence of bioactivity in orange peel essential oil. Th erefore, the objective in this work was to verify the allelopathic proprieties of this oil. We extracted the oil from the peels of recently discarded oranges using water vapor fl ow with a Clevenger extractor, and tested it against the growth of Euphorbia heterophylla L. and Ipomoea grandifolia (Dammer) O'Donell seedlings when placed in contact with the oil vapor. Th e results were both quantitative and qualitative in the inhibition of the seedlings.

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Section: Discussionmentioning

confidence: 96%

Allelopathic effects of orange (Citrus sinensis L.) peel essential oil

Ribeiro

Lima

2012

Acta Bot. Bras.

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“…Several authors have claimed that the essential oil of C. citratus decreases root length in lettuce (Alves et al, 2004), and the germination of weed seeds, such as Amaranthus blitoides, Amaranthus palmeri, Euphorbia hirta L., Sinaps nigra, Trifolium campestri, Lycopersicum esculentum L. and Triticum aesto (Dudai et al, 1999). Fortes et al (2009) noticed that C. citratus extract did not influence the germination and germination speed in soybean, but caused adverse effects on B. pilosa.…”

Section: Germination and Germination Speed Index Of Bidens Pilosamentioning

confidence: 99%

Allelopathic potential of Cymbopogon citratus over beggarticks (Bidens sp.) germination

Krenchinski¹,

Albrecht²,

Albrecht³

et al. 2017

Aust J Crop Sci

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Allelochemicals are important and innovative tools for weed control as they neither harm the environment nor increase weed management costs. The secondary metabolites can be extracted by water or soaking and later applied in soil or leaves. This study evaluated the leaf extracts of Cymbopogon citratus, affecting germination of Bidens pilosa and B. subalternans seeds. Two trials were conducted in germination chambers. The completely randomized design was employed in both trials with 5 replications. Trial one was arranged in a 2×3 double factorial design, with two periods of leave collection (morning and afternoon); and three extract preparations (aqueous extract by maceration, aqueous extract by infusion and control with distilled water). Trial two was set up in a 2×2×5 triple factorial design, with two extracts (aqueous extract by maceration, aqueous extract by infusion); two time of day collection (morning and afternoon) and five extracts concentrations (0; 25; 50; 75 and 100%). The means were compared by F and Tukey's test (p ≤ 0.05). To evaluate extracts concentrations a regression analysis was run. The results showed that the aqueous extract by maceration of C. citratus decreased germination and germination speed of Bidens pilosa and Bidens subalternans more than the aqueous extract by infusion, for both species. The concentrations interfered, inversely and proportionally, decreasing germination and germination speed. The germination of beggarticks was affected by the extracts of C. citratus, suggesting further studies for this plant.

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“…Para os bioensaios de germinação, as placas de Petri (4,0 cm de diâmetro) contendo papel filtro Whatman nº 1,0, autoclavadas, receberam 5,0 mL de água destilada e 30 sementes de S. occidentalis distribuídas aleatoriamente, com quatro repetições para cada solução. Após a semeadura, 3,0 ml da solução de cada concentração do óleo foram distribuídos em dois papéis-filtro e colados na tampa da placa evitando o contato direto com as sementes (Alves et al, 2004). Neste ensaio de germinação e crescimento inicial, a semente não necessita de luz para germinar, tendo em vista que no processo germinativo a respiração é o processo que inclui gasto de energia para o crescimento inicial, não sendo a luz necessária para que ocorra a germinação.…”

Section: Materials E Métodounclassified

Efeito fitotóxico do óleo volátil de Cleome guianensis Aubl. sobre o crescimento inicial de Senna occidentalis L.

Ventura

Silva

Simionatto

et al. 2016

Rev. bras. plantas med.

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RESUMO:Aleloquímicos são substâncias liberadas por certas espécies vegetais no ambiente que influenciam a germinação e o desenvolvimento de outras plantas. O objetivo desse estudo foi avaliar o potencial fitotóxico de Cleome guianensis Aubl., bem como determinar o grau de estresse oxidativo causado em Senna occidentalis L. Para isso, o óleo das folhas de C. guianensis, nas concentrações 0,5 µg/mL, 1,0 µg/mL, 2,5 µg/mL e 5,0 µg/mL, em solução de 5 ml foi testado em bioensaios de germinação e de crescimento da raiz primária e do hipocótilo de S. occidentalis. Os indivíduos de S. occidentalis foram macerados, homogeneizados e submetidos a ensaios de quantificação da catalase, peroxidase, SOD e de peroxidação lipídica. Os resultados indicam que todas as concentrações do óleo volátil causaram um efeito negativo sobre a germinação e crescimento de S. occidentalis. Na concentração 5,0 µg/mL, houve 56% de inibição da germinação e 83% de inibição de crescimento do hipocótilo. Ainda, o óleo aumentou a atividade das enzimas induzidas pelo estresse oxidativo catalase, peroxidase e superóxido dismutase (SOD). Quanto à peroxidação lipídica, o óleo nas concentrações 1,0 µg/ mL, 2,5 µg/mL e 5,0 µg/mL aumentou a produção de malondialdeído. Sendo assim, conclui-se que C. guianensis apresenta aleloquímicos que influenciam na germinação e no crescimento de S. occidentalis, além de aumentar a atividade das enzimas catalase, peroxidase, SOD e a produção de malondialdeído em S. occidentalis. Dessa forma, sugere-se a realização de estudos sobre o perfil químico do óleo a fim de descobrir as substâncias responsáveis por tais resultados e consolidar o potencial fitotóxico de C. guianensis.Palavras-chave: Alelopatia, bioherbicida, estresse oxidativo.ABSTRACT: Phytotoxic effect of Cleome guianensis Aubl. on the initial growth of Senna occidentalis L. Allelochemicals inhibit the germination and growth of other plants. The purpose of this study was to assess the phytotoxic potential of Cleome guianensis Aubl., as well as determine the degree of oxidative stress caused in Senna occidentalis L. For this purpose, oil from the leaves of C. guianensis in concentrations of 0.5 µg/mL, 1.0 µg/mL, 2.5 µg/mL, and 5.0 µg/mL were tested in bioassays on the germination and growth of S. occidentalis. Specimens of S. occidentalis were macerated, homogenized, and submitted to catalase, peroxidase, superoxide dismutase (SOD), and lipid peroxidation quantification tests. Results showed that all concentrations of the volatile oil had a negative effect on S. occidentalis germination and growth. In the 5.0 µg/mL concentration, the oil inhibited 56% of germination and 83% of hypocotyl growth. In addition, the oil increased the activity of the enzymes induced by oxidative stress: catalase, peroxidase, and superoxide dismutase SOD. For lipid peroxidation, the oil in the 1.0 µg/mL, 2.5 µg/mL and 5.0 µg/mL concentrations increased the production of malondialdehyde. In addition, C. guianensis presents allelochemicals that influence the germination and growth of S. occ...

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Alelopatia de extratos voláteis na germinação de sementes e no comprimento da raiz de alface

Cited by 93 publications

References 4 publications

Allelopathic effects of orange (Citrus sinensis L.) peel essential oil

Allelopathic effects of orange (Citrus sinensis L.) peel essential oil

Allelopathic potential of Cymbopogon citratus over beggarticks (Bidens sp.) germination

Efeito fitotóxico do óleo volátil de Cleome guianensis Aubl. sobre o crescimento inicial de Senna occidentalis L.

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