Atividade alelopática de extratos aquosos de plantas medicinais na germinação de Lactuca sativa L. e Bidens pilosa L.

Alves, Lívia Lara; Oliveira, Paulo Vinicius Anderson de; França, Suzelei C.; Alves, Paulo Roberto Arruda; Pereira, Paulo Sérgio

doi:10.1590/s1516-05722011000300012

Cited by 14 publications

(11 citation statements)

References 24 publications

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“…The decreases observed in the germination rate index are a result of the low germination of the seeds exposed to the aqueous extracts, similarly to the results reported by Alves et al (2011).…”

Section: Resultssupporting

confidence: 88%

Allelopathy of aqueous Pachyrhizus erosus L. extracts on Euphorbia heterophylla and Bidens pilosa

Barbosa

Ferreira

Salvalaggio

et al. 2018

Pesqui. Agropecu. Trop.

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Allelopathy contributes to the sustainable management of weeds in growing areas, due to its ability to inhibit the development of weed species. This study aimed to evaluate the allelopathic effect of Pachyrhizus erosus extract on Euphorbia heterophylla and Bidens pilosa germination. The experiment was carried out in a completely randomized design, in a 2 x 2 x 4 factorial scheme, with four replications. The first factor corresponded to the plant portion (shoot and tuberous root), the second to the extract preparation method (water at room temperature and boiling) and the third to the extract concentrations (0 %, 25 %, 50 % and 100 %). Phytochemical analyses were performed to identify the presence of secondary metabolites. The variables germination percentage, germination rate index and dry biomass decreased with increasing aqueous extract concentrations for both E. heterophylla and B. pilosa. When applied a P. erosus crude shoot extract (boiling), decreases of 18 % and 92 % were observed in the E. heterophylla and B. pilosa germination, respectively, with a decrease of 91 % in the dry biomass of E. heterophylla seedlings. The tuberous root extract (boiling), on the other hand, reduced the germination percentages for E. heterophylla and B. pilosa in 18 % and 80 %, respectively. The phytochemical evaluation indicated the presence of flavonoids, coumarins and saponins in the shoot and tuberous root extracts, while tannins were only observed in the shoot extract. Thus, it can be concluded that P. erosus extracts display an allelopathic effect on the weed species evaluated.

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Section: Resultssupporting

confidence: 88%

Allelopathy of aqueous Pachyrhizus erosus L. extracts on Euphorbia heterophylla and Bidens pilosa

Barbosa

Ferreira

Salvalaggio

et al. 2018

Pesqui. Agropecu. Trop.

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“…Moreover, there is a need for genetic and molecular studies of allelopathic plants, in order to increase their protection against competitors, as well to identify allelopathic genes for the transgenic improvement of crop plants. Alves et al 2011 N -native; E -exotic; L -laboratory; X -field.…”

Section: Final Considerationsmentioning

confidence: 99%

Allelopathic research in Brazil

et al. 2013

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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 further studies be conducted in order to explore the potential of plant biodiversity in Brazil. Such studies could lead to the development of new molecular structures (allelochemicals) that could be used in the control of pests and weeds, thereby reducing the use of the harmful synthetic herbicides that are currently being widely employed.

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“…Comportamento semelhante foi observado para as sementes de capim-colonião, que germinaram no segundo dia no tratamento controle, e para a concentração de 1,5 mL/L, no décimo quarto dia (Figura 1). Extratos que apresentam maiores concentrações tendem a atuar de maneira a inibir ou retardar o início da germinação (Rizzardi et al, 2008;Azambuja et al, 2010;Alves et al, 2011), eventualmente tornando as sementes inviáveis (Petersen et al, 2001) devido a ação dos aleloquímicos que interferem tanto no metabolismo da germinação (Bewley & Black, 1994) quanto no desenvolvimento inicial da plântula (Rizzardi et al, 2008). Em relação à porcentagem de germinação, as maiores concentrações do óleo de citronela acarretaram uma maior inibição da germinação das sementes de picão-preto (Figura 2).…”

Section: Resultsunclassified

Efeito alelopático do óleo essencial de Cymbopogon nardus e extrato de Annona muricata na germinação de Bidens pilosa e Megathyrsus maximus

Hirata¹,

Luz²,

Zanetti³

et al. 2018

Rev. Ciênc. Agr.

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R E S U M OO objetivo deste trabalho foi verificar o efeito alelopático do óleo essencial de citronela (Cymbopogon nardus) e de extrato foliar de graviola (Annona muricata) na germinação de sementes de picão-preto (Bidens pilosa) e capim-colonião (Megathyrsus maximus). Utilizou-se como tratamentos: óleo essencial de citronela em diferentes concentrações: 0,25, 0,5, 1,0 e 1,5 mL/L (v/v) e extratos aquosos de graviola diluídos nas concentrações de 25, 50, 75 e 100% (v/v), sendo utilizada água destilada como grupo controle. O delineamento experimental foi o inteiramente casualizado, sendo realizada uma Regressão na Análise de Variância na estatística. Os parâmetros avaliados foram: frequência relativa da germinação, porcentagem de germinação, tempo médio de germinação, velocidade média de germinação e índice de velocidade de germinação. Com o aumento das concentrações de óleo citronela, verificou-se efeito alelopático em todos os parâmetros analisados para as sementes de picão-preto e capim-colonião. As maiores concentrações de extrato de graviola interferiram em todos os parâmetros tanto para o picão-preto como para o capim-colonião. Palavras-chave: plantas daninhas, sementes, alelopatia, herbicidas, manejo A B S T R A C TThe objective of this work was to verify the allelopathic effect of the essential oil of citronella (Cymbopogon nardus) and soursop leaf extract (Annona muricata) on the germination of beggartick's (Bidens pilosa) and Guinea grass' seeds (Megathyrsus maximus). The treatments were: citronella essential oil at the following concentrations: 0.25, 0.5, 1.0 and 1.5 mL/L (v/v) and aqueous soursop extracts at concentrations of 25, 50, 75 and 100% (v / v), and a control group of distilled water. The experimental design was completely randomized, and the statistical analysis were ran with a Regression in Analysis of Variance. The parameters evaluated were: relative germination frequency, percentage of germination, average germination time, average germination speed and germination speed index. The results showed that citronella oil was effective in all concentrations: the higher the concentration, the higher was the effect on beggartick and Guinea grass seed germination. The highest concentrations of soursop extract interfered in the all the parameters of beggartick as well as in Guinea grass.

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Atividade alelopática de extratos aquosos de plantas medicinais na germinação de Lactuca sativa L. e Bidens pilosa L.

Cited by 14 publications

References 24 publications

Allelopathy of aqueous Pachyrhizus erosus L. extracts on Euphorbia heterophylla and Bidens pilosa

Allelopathy of aqueous Pachyrhizus erosus L. extracts on Euphorbia heterophylla and Bidens pilosa

Allelopathic research in Brazil

Efeito alelopático do óleo essencial de Cymbopogon nardus e extrato de Annona muricata na germinação de Bidens pilosa e Megathyrsus maximus

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