Interferência potencialmente alelopática do capim-gengibre (Paspalum maritimum) em áreas de pastagens cultivadas

Filho, Souza

doi:10.1590/s0100-83582006000300005

Cited by 13 publications

(9 citation statements)

References 8 publications

(4 reference statements)

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“…Além disso, estudos evidenciam que Paspalum maritimum possui mecanismos de interferência na germinação e desenvolvimento de plantas adjacentes (Souza Filho 2006;Souza Filho e Mourão Jr. 2010). Estas características provavelmente estão relacionadas ao baixo valor de cobertura de outras espécies que dividiam espaço com Paspalum maritimum e Paspalum ligulare.…”

Section: Discussionunclassified

Caracterização estrutural e status de conservação do estrato herbáceo de dunas da Praia de São Marcos, Maranhão, Brasil

2016

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RESUMOAs dunas costeiras têm sido apontadas como um dos ambientes mais deteriorados do litoral brasileiro ameaçando assim a vegetação de restinga. O objetivo desse estudo foi descrever a fitossociologia do estrato herbáceo da vegetação de Structural characterization and conservation status of the herbaceous stratum at Praia de São Marcos dunes, Maranhão State, Brazil ABSTRACTThe coastal dunes have been identified as one of the most degraded environments. On the Brazilian coast, they threat the "restinga" vegetation. The objective of this study was to describe the phytosociological structure of the herb layer of dune vegetation and assess the conservation status of the area on the Maranhão coast. The study was conducted at São Marcos Beach located in the northern portion of the Maranhão Island. For the phytosociological sampling, we used the plot's method (50 plots of 1 m 2 ), and analyzed the traditional phytosociological parameters of vegetation. Also, there were determined the life forms, phytogeographic distribution and conservation status of vegetation community on site. In the sample of 50 m² we found 35 species from which Paspalum maritimum, Paspalum ligulare, Cassytha filiformis, Chamaecrista hispidula and Euploca polyphylla showed the highest importance value. When calculated for the cover values, the Shannon diversity index (H') was 1.69 nats m -² and it was 3.04 nats m -² when calculated for the frequency values. The area showed predominance of chamaephytes and therophytes indicating an adaptive strategy of vegetation to withstand adverse weather conditions. The sampled ecosystem presented widely distributed species in the Brazilian biomes, being absent endemism. There were identified 14 impacts factors of which five hit more severely the restinga vegetation of the São Marcos Beach. Therefore, more studies are needed with a focus on conservation of dune ecosystems to prevent damage compromising the plant diversity of these areas.

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Section: Discussionunclassified

Caracterização estrutural e status de conservação do estrato herbáceo de dunas da Praia de São Marcos, Maranhão, Brasil

2016

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“…Data obtained by Souza Filho (2006) shows germination inhibition in the seeds of Mimosa pudica, Senna obtusifolia, Pueraria phaseoloides and Brachiaria brizantha cv. Marandu when exposed to the extract of Paspalum maritimum leaves, invasive species belonging to the Poaceae.…”

Section: Greenhouse Bioassaymentioning

confidence: 99%

Biological Activity of Bambusa vulgaris Schrad. ex J.C. Wendl. (Poaceae)

Alencar¹,

Silva²,

Figueiredo³

et al. 2015

JAS

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This study aims to evaluate the allelopathic activity of Bambusa vulgaris Schrad. ex J.C. Wendl., invasive species in an area of Cerrado in the Chapada do Araripe in Ceará. The treatments consisted of the aqueous extract in concentrations of 25, 50, 75 and 100% and a Control (distilled water), with five replicates containing 20 seeds each. The tests were carried out in the laboratory and in a greenhouse, using corn and beans as the test seeds. The parameters analyzed were number of germinated seeds, measurement of caulicle and radical length, occurrence of radicle necrosis and germination speed index (GSI). The results obtained from the laboratory bioassays on corn seeds indicate that the extract affected development of the seedlings, reducing caulicle growth and increasing radicle length, in addition to causing radicle necrosis. Regarding the bean seeds, there was a delay in the GSI, reduced caulicle growth and radicle necrosis. In the bioassay conducted in the greenhouse, for the corn seeds the extract inhibited germination and both caulicle and radicle growth, as well as delaying the GSI. When tested on the beans, the extract provoked reduction in the number of germinated seeds at the higher concentrations, delayed the GSI, reduced the radicle size and caused radicle necrosis. The allelopathic effects observed in the greenhouse were more significant, suggesting that environmental factors in conjunction with the action of the allelochemicals interfered more actively with the seed germination and seedling development of the receptor species.

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“…Selected studies employing the terms "allelopathy" and "allelochemicals", published between 1991 and 2010 in journals listed in the Thomson-Reuters Journal Citation Reports. 1991-199520012006 the proportion of papers coming from Brazilian authors is rapidly climbing, indicating that the scientific production of Brazil is gaining greater international exposure. More papers dealing with allelopathy could have been added to our selection had we sought papers related to phytotoxicity, the modes of action of allelochemicals or even the genetic aspects of allelochemical production and release.…”

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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Interferência potencialmente alelopática do capim-gengibre (Paspalum maritimum) em áreas de pastagens cultivadas

Cited by 13 publications

References 8 publications

Caracterização estrutural e status de conservação do estrato herbáceo de dunas da Praia de São Marcos, Maranhão, Brasil

Caracterização estrutural e status de conservação do estrato herbáceo de dunas da Praia de São Marcos, Maranhão, Brasil

Biological Activity of Bambusa vulgaris Schrad. ex J.C. Wendl. (Poaceae)

Allelopathic research in Brazil

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