Metodologias empregadas em estudos de avaliação da atividade alelopática em condições de laboratório: revisão crítica

Filho, A.P.S. Souza; Guilhon, Giselle Maria Skelding Pinheiro; Santos, Lourivaldo S.

doi:10.1590/s0100-83582010000300026

Cited by 48 publications

(42 citation statements)

References 22 publications

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“…The solution was added only once, at the beginning of bioassays, and, from then on, only distilled water was added whenever it was necessary (Souza Filho et al, 2010). Immediately after adding the substrate on the Petri dish, using tweezers, 20 seeds were distributed on the paper, spacing them to ensure growth.…”

Section: Methodsmentioning

confidence: 99%

Toxicity of biofertilizers on seeds of lettuce and maize

Spiassi¹,

Santos²,

Nóbrega³

et al. 2015

Científica

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This study evaluated the toxicity of biofertilizers using lettuce seed as bioindicator and maize as cropped plant. The experiment was carried out with five treatments consisting of biofertilizers and manure obtained from mixtures of cattle and ovine litter: T1 -100% cattle manure; T2 -50% cattle manure and 50% ovine litter; T3 -75% cattle manure and 25% ovine litter; T4 -75% ovine litter and cattle 25%; T5 -100% ovine litter and T0 control -distilled water. Five concentrations of each treatment were used with 3, 6, 9, 12 and 15% in three replications submitted to biological testing. The use of biofertilizers with high EC negatively influences lettuce seed germination, the shoots of seedlings when diluted act as a stimulant. The biofertilizer did not affect the maize seeds germination and the seedlings growth was stimulated.Additional keywords: cattle manure; conductivity; ovine litter. ResumoO objetivo deste trabalho foi verificar a toxicidade de biofertilizantes utilizando sementes de alface como bioindicadoras e de milho como planta cultivada. O experimento contou com cinco tratamentos constituídos por biofertilizantes obtidos de misturas de dejetos de bovinos e cama de ovinos: T 1 -100% dejeto bovino; T 2 -50% dejeto bovino e 50% cama de ovino; T 3 -75% dejeto bovino e 25% cama de ovino; T 4 -75% cama de ovino e 25% dejeto bovino; T 5 -100% cama de ovino e a testemunha T 0 -água destilada. Cinco concentrações de cada tratamento foram utilizadas sendo elas 3, 6, 9, 12 e 15%, com três repetições, submetidas ao teste biológico. Os resultados mostram que a utilização de biofertilizantes com alta C.E. influencia negativamente a porcentagem de germinação das sementes de alface, mas agem como estimulantes do comprimento de parte aérea de plântulas. Em sementes de milho, o uso dos biofertilizantes não influencia a porcentagem de germinação, porém o crescimento de plântulas é estimulado.Palavras-chave adicionais: cama de ovino; condutividade elétrica; dejeto bovino.

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Section: Methodsmentioning

confidence: 99%

Toxicity of biofertilizers on seeds of lettuce and maize

Spiassi¹,

Santos²,

Nóbrega³

et al. 2015

Científica

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“…More recently, Souza--Filho et al (2010) carried out a review of experimental procedures used in laboratory-based allelopathy studies. In the last two decades, there has been a proliferation of studies on the allelopathic properties of species that are native to, introduced to or cultivated in Brazil.…”

Section: Allelopathy Studies Carried Out In Brazilmentioning

confidence: 99%

“…This literature review focuses on allelopathy studies conducted in Brazil. This theme has been addressed in earlier reviews (Ferreira et al 1992;Rodrigues et al 1999), as well as in a more recent review of experimental procedures used in laboratory-based allelopathy studies (Souza-Filho 2010). Only the interactions between plants were considered in this review, regardless of whether the effects were negative or positive.…”

Section: Introductionmentioning

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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“…One of the main analyzed variables in allelopathic tests is germination; however, this is less sensitive to allelochemicals than seedling development (Souza Filho et al, 2010). Therefore, this did not happened in these tests, in which extracted soil solutions in area with turnip and hairy vetch changed seeds germination patterns of beggartick and did not affect its initial development.…”

Section: Resultsmentioning

confidence: 97%

“…A lot of work done has been allelopathic effects on weeds in recent years (Isik et al, 2009;Souza et al, 2010;Mauli et al, 2011;Rosa et al, 2011), however, many things still need to be studied and what new information will be added to science via this research. Knowledge of occurrence and activity of microorganisms and natural compounds in soil processes underlies the design of crop rotation and residue management, in order that they get more efficient and conservationist (Pedrol et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Seeds germination and early development of beggartick on extracted soil solution from an area with cover crops

Mauli¹,

Nóbrega²,

Filho³

et al. 2015

Afr. J. Agric. Res.

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Plants produce and store many products of secondary metabolism that are released into the environment and can influence direct or indirectly on nearby organisms. Thus, this study investigated the allelopathic potential of extracted soil solution from an area with cover crops according to germination and early development of beggartick. Soil solution was extracted in an area where black oats, turnip and hairy vetch were grown. The concentrated solution was tested in sand substrate while the dilutions were tested in 100; 200; 300 and 400 ml L -1 germitest paper substrate, plus the control treatment on beggartick. Germination was tested for 10 days and the early development for 20 days. Twenty seeds or seedlings were distributed in gerbox, with three replications and the experimental design was completely randomized (CRD). Soil solution showed considerable changes on beggartick germination only in the last collections, mainly with extracted solution in an area cropped with turnip and hairy vetch. The results, in this case, were more significant when germitest was used than with sand substrate. Therefore, it is recommended these cover crops in crop rotation, aiming to reduce beggartick infestation in a long term.

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Metodologias empregadas em estudos de avaliação da atividade alelopática em condições de laboratório: revisão crítica

Cited by 48 publications

References 22 publications

Toxicity of biofertilizers on seeds of lettuce and maize

Toxicity of biofertilizers on seeds of lettuce and maize

Allelopathic research in Brazil

Seeds germination and early development of beggartick on extracted soil solution from an area with cover crops

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