Allelopathic Effect of Conyza albida on Avena sativa and Spirodela polyrhiza

Economou, George; Τζακου, Ολγα; Gani, A.; Yannitsaros, A.; Bilalis, Dimitrios

doi:10.1046/j.1439-037x.2002.00565.x

Cited by 26 publications

(26 citation statements)

References 13 publications

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“…Shoot extracts of C. canadensis and volatile compounds from the inflorescence of invasive Conyza albida, a closely related species, exerted significant inhibitory effects on the germination and growth of several crop species (Economou et al, 2002;Shaukat et al, 2003). In the present experiment, the aqueous extracts of aboveground parts and the roots of C. canadensis greatly inhibited seed germination and the shoot growth of three dominant native herb species, P. asiatica, D. sanguinalis, and Y. japonica, under laboratory conditions, even at a low concentration (0.05 g mL).…”

Section: Discussionmentioning

confidence: 99%

Aqueous tissue extracts of Conyza canadensis inhibit the germination and shoot growth of three native herbs with no autotoxic effects

Hu¹,

Zhang²

2013

Planta daninha

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-Conyza canadensis is a widespread weed species forming dense populations in most regions of China. Petri dish bioassays with aqueous extracts of the aboveground parts and roots of C. canadensis at three concentrations (0.05, 0.1, and 0.2 g mL -1) were undertaken to investigate the autotoxic effects of C. canadensis, and the possible effects on three dominant native weed species, Plantago asiatica, Digitaria sanguinalis and Youngia japonica. The results showed that seed germination and the shoot length of three native species were significantly inhibited by aqueous extracts of C. canadensis at almost all concentrations that generally increased with increasing extract concentration. However, the seed germination and shoot length of C. canadensis itself was not significantly affected by the same extracts at all concentrations. These results suggested that the potential allelopathic compounds produced by the tissue of C. canadensis may contribute to its invasive success in invading southern China.Keywords: invasive alien weed, allelopathy, petri dish bioassay. Palavras-chave: planta daninha invasiva alienígena, alelopatia, bioensaio em placa de Petri. RESUMO -

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Section: Discussionmentioning

confidence: 99%

Aqueous tissue extracts of Conyza canadensis inhibit the germination and shoot growth of three native herbs with no autotoxic effects

Hu¹,

Zhang²

2013

Planta daninha

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“…Weeds remain one of the most significant agronomic problems especially in organic farming. As chemical methods of weed control is not advocated there is a strong interest in developing alternative methods of weed control in organic agriculture (Economou et al, 2002). Mulching reduced the weed population in wheat was reported by Radwan and Hussein (2001).…”

Section: Organic Mulches On Weedsmentioning

confidence: 99%

Enhancing the growth and yield of pigeon pea through growth promoters and organic mulching- A review

Rajesh¹,

Paulpandi²,

Duraisingh³

2015

Afr. J. Agric. Res.

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Pigeon pea, a widely spaced row crop having initial slow growth is sensitive to weed competition during early stages of its growth period. A large proportion of uncovered land during early stages is taken over by rank weed growth, which may cause drastic reduction in growth and yield of pigeon pea. Pigeon pea with additional canopy may suppress weeds, due to shade. To accomplish the same, foliar application of micro nutrient mixture and growth promoters as well as mulching with black gram crop resides were made to increase the growth and spread of pigeon pea and to find its effect on growth, yield and weed suppressing ability.

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“…fornecem, em alguma medida, resultados mais intensos promovidos por extratos preparados a partir das folhas (Chon & Kim, 2002;Tefera, 2002;Gatti et al, 2004;Rashid et al, 2010). Adicionalmente a essas informações, Tawaha & Turk (2003) mostram que, para a espécie Brassica nigra, a intensidade dos efeitos alelopáticos varia na seguinte ordem decrescente de intensidade: folhas>flores>mistura da planta inteira>colmos>raízes, enquanto para Conyza albida a grandeza das inibições variou, de forma decrescente, na seguinte ordem: folhas>inflorescência>colmo (Economou et al, 2002).…”

Section: Análise Da Atividade Alelopática Em Sementesunclassified

Sementes como fonte alternativa de substâncias químicas com atividade alelopática

Filho¹,

Trezzi

Ioue³

2011

Planta daninha

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4RESUMO -Na literatura mundial, observa-se predominância das folhas como meio preferencial de estudos de compostos químicos promissores, embora informações sobre outras frações da planta também sejam encontradas. Essa tendência se deve ao fato de que a maioria dos estudos mostra as folhas com atividade potencialmente alelopática de intensidade superior à das demais frações. Nesta revisão, procurou-se compilar e analisar as informações disponíveis sobre a importância das sementes como fonte alternativa de compostos químicos com atividade alelopática. São discutidas as variações na produção e na alocação de aleloquímicos em função do estádio ontogenético das sementes presentes no banco de sementes. É discutido também o papel dos aleloquímicos produzidos por sementes na repelência de insetos, na inibição do desenvolvimento de patógenos nas sementes, na inibição do desenvolvimento inicial de plantas daninhas e como sinalizador positivo para a simbiose com microrganismos do solo. Apresenta-se ainda a atividade alelopática de diversas substâncias isoladas de sementes, destacando-se os alcaloides, flavonoides, benzoxazinoides e resinas glicosídicas. Os estudos de aleloquímicos produzidos por sementes podem contribuir expressivamente para o melhor entendimento do papel ecológico que essas substâncias desempenham na ecologia química dos agro e ecossistemas.Palavras-chave: aleloquímicos, função nas sementes, repelência de insetos, inibição de plantas daninhas, inibição de patógenos.ABSTRACT -In the literature, leaves predominate as preferred source of studies of promising allelopathic compounds, but information on other plant fractions are also found. This trend is due to the fact that most studies show that leaves have higher allelopathic potential than other plant fractions.In this review, we compiled and analyzed the information available on the importance of seeds as an alternative source of chemical compounds with allelopathic activity. We discussed the variations in production and allocation of allelochemicals at different ontogenetic stages of the seeds in the seed bank. The role played by the allelochemicals produced by the seeds on insect repellency, inhibition of the development of pathogens in seeds, initial development of competing plants and as positive signaling for the symbiosis with soil microbes were also studied. The allelopathic activity of several compounds isolated from the seeds was presented, especially alkaloids, flavonoids, resins, and benzoxazinoid glucosides. Studies of allelochemicals produced by the seeds can contribute significantly to a better understanding of the ecological role they play in the chemical ecology of agro-ecosystems and ecosystems.

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Allelopathic Effect of Conyza albida on Avena sativa and Spirodela polyrhiza

Cited by 26 publications

References 13 publications

Aqueous tissue extracts of Conyza canadensis inhibit the germination and shoot growth of three native herbs with no autotoxic effects

Aqueous tissue extracts of Conyza canadensis inhibit the germination and shoot growth of three native herbs with no autotoxic effects

Enhancing the growth and yield of pigeon pea through growth promoters and organic mulching- A review

Sementes como fonte alternativa de substâncias químicas com atividade alelopática

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