Allelopathic effects of foliage extracts from four Chenopodiaceae species on seed germination

Jefferson, Lara; Pennacchio, Marcello

doi:10.1016/s0140-1963(03)00028-4

Cited by 102 publications

(73 citation statements)

References 16 publications

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“…Changes in germination parameters can result from the effects of several physiological processes: membrane permeability, DNA transcription and translation, second messengers function, respiration, enzymes and receptors conformation (Ferreira, 2004;Rizvi and Rizvi, 1992). Slower germination plants can present reduced size (Jefferson and Pennacchio, 2003), leading to greater susceptibility to stress and less chances in resource competition. The species' sensibility to phytotoxins under laboratory conditions is dependent of biochemical/physiological characteristics (Kobayashi, 2004), seed size and structure.…”

Section: Discussionmentioning

confidence: 99%

Seasonality effect on the allelopathy of cerrado species

et al. 2014

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The Brazilian cerrado presents strong climate seasonality. During the dry season, plants may be exposed to stressful situations, such as a soil surface water deficit, that stimulate their chemical defenses. However, the seasonality effect on the production of allelopathic compounds of cerrado plant species is poorly understood. In this study, the phytotoxic activities of common native cerrado plants were evaluated during rainy and dry seasons. Crude leaves extracts (10% concentration: weight/volume, with dry leaves and distilled water) from eleven species were tested on lettuce and sesame germination. The negative effects on germination percentages, rates and informational entropies of the target species were higher when submitted to plant extracts from the dry season, where the germination rate was the most sensible parameter. The higher sensibility of lettuce and the germination rate parameter showed this difference. Only two exceptions had higher effects for rainy season extracts; one species showed higher negative effects on germination informational entropy of lettuce and another species on the germination rate of sesame. Thus, increases in the allelopathic activity were seen in the majority of the studied cerrado plant species during the dry season. These distinct responses to stressful situations in a complex environment such as the Brazilian cerrado may support the establishment and survival of some species.Keywords: chemical ecology, phytotoxicity, secondary metabolites. Efeito da sazonalidade sobre a alelopatia de espécies de cerradoResumo O cerrado brasileiro apresenta forte sazonalidade climática. Durante a estação seca as plantas podem estar expostas a situações estressantes, tais como um déficit de umidade nas camadas superficiais do solo, que estimulam suas defesas químicas. No entanto, o efeito da sazonalidade na produção de compostos alelopáticos de espécies vegetais de cerrado é pouco conhecido. Neste estudo, as atividades fitotóxicas de plantas nativas comuns de cerrado foram avaliadas durante as estações chuvosa e seca. Extratos brutos de folhas (concentração 10%: peso/volume, com folhas secas e água destilada) de onze espécies foram testados sobre a germinação de alface e gergelim. Os efeitos negativos sobre as porcentagens de germinação, velocidades e entropias informacionais das espécies-alvo foram maiores quando submetidas a extratos vegetais da estação seca. A maior sensibilidade da alface e do parâmetro velocidade de germinação mostraram essa diferença. Apenas duas exceções tiveram maiores efeitos para extratos da estação chuvosa; uma espécie mostrou maiores efeitos negativos sobre a entropia informacional de germinação de alface e outra espécie sobre a velocidade de germinação de gergelim. Assim, aumentos na atividade alelopática foram vistos na maioria das espécies vegetais do cerrado estudadas durante a estação seca. Estas respostas distintas a situações estressantes em um ambiente complexo como o cerrado brasileiro podem auxiliar no estabelecimento e na sobrevivência de algu...

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Section: Discussionmentioning

confidence: 99%

Seasonality effect on the allelopathy of cerrado species

et al. 2014

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“…In addition to direct or indirect harmful effects on plants, allelopathic chemicals might have beneficial effects as well (Rice, 1984). Allelopathic chemicals are generally secreted by the leaves of the plant; they can also be secreted from the flowers, shoots, roots of living plants or from plant residues after harvesting (Putnam and DeFrank, 1983;Jefferson and Pennacchio, 2003;Roshchina, 2009). …”

Section: Introductionmentioning

confidence: 99%

The inhibiting effects of scots pine (Pinus sylvestris) on germination ability and growth of some culture ryegrass species

Aklıbaşında¹,

Külekçi²,

Demir³

et al. 2017

JEB

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Aim :Methodology : Results :Interpretation :Allelochemicals present in some plants exert inhibitory effects on growth and development of other plants. This study was carried out due to the observation of weak development in the ryegrass under Scots Pine to explore whether allelochemicals contained by the leaves of Scots Pine (Pinus sylvestris sp.) plant had an inhibitory effect on germination ability and development of Lolium multiflorum 'Casamba', Agrostis tenuis 'Highland' and Festuca arundinacea 'Apache' culture forms among ryegrass plants.Extracts collected from dried Scots pine (Pinus sylvestris sp.) leaves were applied to -1 specified grass seeds at different test concentrations (10, 20, 30, 40 and 50 g l ). Control group was incubated with distilled water, while treatment groups were incubated with 4 ml of prepared extracts.Findings indicated that these extracts had inhibitory effects on germination and growth in grass plants depending on the seed type and applied concentrations. Among these analyzed three species, the highest allelopathic (inhibitory) effect dependent to concentrations was observed in A. tenuis, while the lowest allelopathic effect was observed in L. multiflorum species.Allopathic effect should be considered when ryegrass is planted under the pine trees to prevent economic losses. Journal of Environmental Biology

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“…It plays a significant role in agroecosystems, and affects the growth, quality and quantity of the produce (Kohli et al, 1998;Singh et al, 2001). A number of plant species have been reported to have an allelopathic effect on other plant species (Mallik, 1987;Martin and Smith, 1994;Kato-Noguchi, 2003;Jefferson and Pennacchio, 2003;Oueslati, 2003;Djurdjevic et al, 2004). Allelochemicals produced by one crop species can influence the growth, productivity, and yield of other crops or the same crop .…”

Section: Introductionmentioning

confidence: 99%