Potencial alelopático do capim-annoni-2 (Eragrostis plana Nees) na germinação de sementes de gramíneas perenes estivais

Ferreira, Nadilson Roberto; Medeiros, Renato Borges de; Soares, Geraldo Luiz Gonçalves

doi:10.1590/s0101-31222008000200006

Cited by 41 publications

(45 citation statements)

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“…At the vegetative stage, probably because the time between the applications of N and the harvest was the shortest, there was no difference 5 among doses. In the tough lovegrass that was not fertilized with N, Alfaya et al (2002) The allelopathic effect of the aqueous extracts on lettuce was visually observed (Figure 3) and quantified according to the germinability and the GSI (Table 2), in accordance with other authors who evaluated the allelopathic potential of the tough lovegrass (Ferreira et al, 2008;Favaretto et al, 2011). The allelopathic symptoms, in a greater or a lesser degree and depending of the extract, included necrosis, shortening and winding of the root apex (Figure 3), which is commonly reported in bioassays of this type (Souza Filho et al, 1997).…”

Section: Resultssupporting

confidence: 84%

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Allelopathy and Allelochemicals of Eragrostis plana (Poaceae) and its Relation with Phenology and Nitrogen Fertilization

et al. 2017

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-This study was conducted in order to verify if the phenological stage and the nitrogen fertilization interfere in the allelopathic activity and in the concentration of potentially allelopathic phenolic compounds of tough lovegrass (Eragrostis plana). The assay consisted of a bifactor 3 (0.100 and 200 kg N ha -1 ) x 2 (harvested in vegetative and reproductive stages), in a split plot design. The N doses constituted the main plot and the phenological stage during the harvest the subplots, resulting in six treatments. The tough lovegrass plants derived from each of the treatments were subjected to allelopathy bioassays, in which aqueous extracts of the aerial parts were applied to lettuce cypselae (Lactuca sativa) and to phytochemicals tests when ethanolic extracts were used, with subsequent partition with ethyl acetate, followed by a high-performance liquid chromatography analysis. There was nitrogen x phenological stage interaction on biological and chemical attributes. The allelopathic extracts were, in descending order of inhibition of germination, those from plants harvested at the vegetative stage and fertilized with 100 kg N and at the flowering stage with 200 kg N, which showed the highest catechin concentrations. The caffeic, ferulic, p-coumaric and vanillic acids were in a higher concentration in flowered and fertilized plants with 0 or 200 kg N. The management of the nitrogen fertilization and the harvesting age influence the allelopathic activity and the phytochemical composition of tough lovegrass.Keywords: germinability, phenolic acids, catechin, epicatechin. RESUMO -Este estudo foi realizado com o objetivo de verificar se a fenologia e a adubação nitrogenada interferem na atividade alelopática e na composição fenólica do capim-annoni (Eragrostis plana

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Section: Resultssupporting

confidence: 84%

“…The success of this species in colonizing extensive rural and ruderal areas is attributed, in part, to its allelopathic action (Ferreira et al, 2008;Favaretto et al, 2011). Recent studies have indicated the presence of phenolic compounds in the roots and leaves of this grass (Favaretto et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Allelopathy and Allelochemicals of Eragrostis plana (Poaceae) and its Relation with Phenology and Nitrogen Fertilization

et al. 2017

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“…This alien African grass is the most abundant and aggressive invasive plant in the Pampa Biome, responsible for causing widespread economic impacts on livestock by modifying the structure of plant communities and by affecting ecological balances. The heterotoxicity of tough lovegrass was been observed in bioassays of seed germination with white clover (Trifolium repens), Italian ryegrass (Lolium multiflorum), African bristlegrass (Setaria sphacelata), and bahiagrass (Paspalum notatum) (Coelho, 1986;Ferreira et al, 2008;Favaretto et al, 2011). However, it was assumed that tough lovegrass may also display autotoxicity, because in the field, the clumps are separated from each other by empty spaces with bare soil radius of 5-10 cm (Coelho, 1986).…”

Section: Introductionmentioning

confidence: 99%

AUTOTOXICITY IN TOUGH LOVEGRASS ( Eragrostis plana )

2017

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ISSN 0100-8358 (print) 1806-9681 (online) AUTOTOXICITY IN TOUGH LOVEGRASS (Eragrostis plana) Autotoxicidade em Capim-annoni (Eragrostis plana)ABSTRACT -Autotoxicity in tough lovegrass has been analyzed in the field, but has never been tested in allelopathy bioassays. Therefore, this study aimed to verify and compare the autotoxicity of leaves and roots from aqueous extracts of tough lovegrass on its germination and early seedling growth. Extracts of green leaves (GL), senescent leaves (SL), and roots (R) at concentrations of 0.05, 0.15, and 0.25 g mL -1 were analyzed on how they affected seed germination and seedling growth. The extracts, regardless of the source or concentration of the material used, have significantly reduced germination percentage, index of germination speed, and root growth of seedlings of tough lovegrass. Effects on mean germination time and shoot length varied according to the origin and concentration of the extracts. GL, at concentrations 0.15 and 0.25 g mL -1 , showed the most damaging effect. In tough lovegrass, autotoxicity is a mechanism that may be involved in the control of germination and plant growth, which could explain the distance between their clumps in the field.Keywords: allelopathy, aqueous extracts, Eragrostis plana, germination. RESUMO -A autotoxicidade no capim-annoni é observada no campo, mas nunca

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“…Vegetation communities under this condition sustain larger amounts of green forage mass, accumulate dead and senescent material, eliminate soil open gaps, reduce the light penetration and the soil temperature on the soil surface. Together, these factors induce the allelopathic effect on the superficial soil layer or on South African lovegrass itself (Coelho, 1986;Ferreira et al, 2008), which, according to Mohler (2001), are harmful to seed germination and plant recruitment. On the contrary, the greatest invasion occurred under continuous grazing, regardless of the initial soil disturbance, and it was directly associated with a lower height of the native pasture imposed initially by the intensive grazing and, subsequently, maintained low by continuous grazing.…”

Section: Resultsmentioning

confidence: 99%

Prevention of natural grassland invasion by Eragrostis plana Nees using ecological management practices

Focht

Medeiros

2012

R. Bras. Zootec.

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-The objective of this research was to evaluate the effects of different types of disturbance on the ability of the natural grassland to avoid the invasion of Eragrostis plana Nees (South African lovegrass). The experiment was carried out in Dom Pedrito, Rio Grande do Sul, Brazil, in an area free of South African lovegrass, from Feb. 2004 to Apr. 2007. The treatments were: 1) grassland management regimes: exclusion; low grazing intensity (rotational grazing), ±10 cm; and high grazing intensity (continuous grazing), ±5 cm; 2) initial levels of soil disturbance: high grassland, ±10 cm; low grassland, ±5 cm height; and low grassland with scarified soil; 3) fertilization regimes: without fertilization; phosphorus; and nitrogen. The experimental design was a split-split-plot type in complete blocks, with three replicates. Three winter cultivated species -Trefoil repens L., Lotus corniculatus L., Lolium multiflorum Lam. and South African lovegrass -were sown in 54 split-splitplots (split-plots: low grassland, and low grassland with scarified soil). The other 27 split-split-plots (split-plots: high grassland) were sown only with South African lovegrass. The grassland height, plant number of South African lovegrass, grassland dry mass and photosynthetic active radiation intercepted (FARint) at the soil level were recorded. The fertilization regimes did not influence the South African lovegrass plant number. The initial levels of soil disturbance and grassland management regimes influenced the invasion of South African lovegrass. The invasion was favored by the lower grassland height and lower forage mass, higher intensity of the soil disturbance, and higher FARint due to the continuous grazing. On the contrary, higher grassland height, higher forage mass, lower soil disturbance and lower FARint, associated with rotational grazing or exclusion, showed higher potential to control the invasion of South African lovegrass in the natural grassland.

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Potencial alelopático do capim-annoni-2 (Eragrostis plana Nees) na germinação de sementes de gramíneas perenes estivais

Cited by 41 publications

References 6 publications

Allelopathy and Allelochemicals of Eragrostis plana (Poaceae) and its Relation with Phenology and Nitrogen Fertilization

Allelopathy and Allelochemicals of Eragrostis plana (Poaceae) and its Relation with Phenology and Nitrogen Fertilization

AUTOTOXICITY IN TOUGH LOVEGRASS ( Eragrostis plana )

Prevention of natural grassland invasion by Eragrostis plana Nees using ecological management practices

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