Alelopatia de duas espécies de braquiária em sementes de três espécies de estilosantes

Laura, Valdemir Antônio; Pereira, Sílvia Rahe; Deiss, Caroline

doi:10.1590/s0103-84782012001000007

Cited by 14 publications

(13 citation statements)

References 7 publications

(5 reference statements)

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“…Contudo, as gramíneas em geral interferem no desenvolvimento de plântulas competindo por luz, nutrientes e espaço e podem comportar-se como uma barreira para o estabelecimento de outras espécies (Toledo et al, 2001;Rodrigues et al, 2012). No caso da transposição do banco de sementes, estas gramíneas poderão agir como limitadoras para o estabelecimento de plântulas e de outras sementes dispersas na área (Vieira, 2004).…”

Section: Resultsunclassified

Transposição do banco de sementes para restauração ecológica da floresta estacional no Rio Grande do Sul

Piaia

Rovedder

Costa

et al. 2017

Agraria

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RESUMOO objetivo deste estudo foi avaliar o potencial da transposição do banco de sementes para restauração ecológica da Floresta Estacional em Santa Maria, Rio Grande do Sul. Avaliaram-se o banco de sementes do centro (BSI) e da borda (BSII) de um fragmento florestal. O solo foi depositado em parcelas de 1 m 2 , em delineamento inteiramente casualizado com três tratamentos (BSI, BSII e Testemunha) e seis repetições, em dois tipos de solo, Argissolo Bruno-Acinzentado (PBAC) e Argissolo Vermelho (PV). Avaliaram-se composição florística, emergência de plântulas, densidade e mortalidade em cada tratamento e tipo de solo durante doze meses. Foi realizado ANOVA com medidas repetidas para comparar os tratamentos em relação à emergência, densidade, mortalidade e riqueza de espécies ao longo de doze meses. Houve diferença significativa entre os tratamentos para riqueza e densidade. O número de espécies foi crescente no decorrer dos doze meses. A densidade foi influenciada pelo período de inverno, onde apresentou decréscimo, e pelo grau de hidromorfia do solo. A transposição do banco de sementes permitiu a inclusão da forma de vida arbórea e mostrou-se eficiente apresentando aumento da diversidade nos locais de deposição. Palavras-chave: hidromorfia; nucleação; sucessão ecológica Transposition of the seed bank for ecological restoration of seasonal forest in Rio Grande do Sul, Brazil ABSTRACTThe aim of this study was to evaluate the potential of the seed bank transposition for ecological restoration of the Seasonal Forest in Santa Maria, Rio Grande do Sul. We evaluated the seed bank of the center (BSI) and the seed bank of the edge (BSII) of a forest fragment. The soil was deposited in 1 m 2 plots in a completely randomized design with three treatments (BSI, BSII and control) and six replications, in two soil types, Argisol Bruno-Greying (PBAC) and Ultisol (PV). We evaluated floristic composition, seedling emergence, density and mortality in each treatment and soil for twelve months. We carried out ANOVA with repeated measures from twelve months to compare treatments in relation to emergency, density, mortality and species richness. There was a significant difference between treatments for richness and density. The number of species has been increasing over the twelve months. The density was influenced by the winter period and degree of soil hydromorphy. Transposition of the seed bank enabled the inclusion of the tree lifeform and demonstrate to be efficient presenting increase diversity in the deposition sites.

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Section: Resultsunclassified

Transposição do banco de sementes para restauração ecológica da floresta estacional no Rio Grande do Sul

Piaia

Rovedder

Costa

et al. 2017

Agraria

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“…The identification of phytotoxicity in the tissues of Urochloa spp. , Barbosa et al 2008, Rodrigues et al 2012 suggests that these invasive species could benefit from their phytotoxic effects on other species in their expansion over natural as well as degraded areas (Barbosa et al 2008). Taking into consideration that leaf tissues of a wide range of tree species of the Cerrado have demonstrated phytotoxicity against the growth of several species (Reigosa et al 2013), including species of the genus Urochloa (Souza Filho 2006), these results suggest that the tree cover and natural production of plant litter could reduce the establishment of these invasive species in physiognomies where the tree component of the vegetation is present.…”

Section: Resultsmentioning

confidence: 99%

Pequi leaves incorporated into the soil reduce the initial growth of cultivated, invasive and native species

Allem

Gomes

Borghetti

2014

An. Acad. Bras. Ciênc.

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Studies have identified the phytotoxicity of many native species of the Cerrado; however, most of them were conducted either in inert substrates, or using exaggerate proportions of plant material. We investigated the phytotoxicity of pequi leaves added to substrate soil in quantities compatible with the litter produced by this species. Pequi leaves were triturated and added to red latosol in concentrations of 0.75%, 1.5% and 3%; the control was constituted of leafless soil. These mixtures were added to pots and irrigated daily to keep them moist. Germinated seeds of the cultivated sorghum and sesame, of the invasive brachiaria and of the native purple ipê, were disposed in the pots to grow for five to seven days at 30 °C within a photoperiod of 12 h. Seedlings of all the species presented a reduction in their initial growth in a dose-dependent way. In general, the root growth was more affected by the treatments than the shoot growth; moreover, signs of necrosis were observed in the roots of the sorghum, sesame and brachiaria. The phytotoxic effects generated by relatively small quantities of leaves, in a reasonable range of species within a soil substrate, suggest potential allelopathy of pequi leaves under natural conditions.

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“…However, for pasture system consortiums, the presence of these substances has disadvantages, as the resulting inefficiency of the systems hinders the establishment of different plant species (Rodrigues et al 2012). The identified constituents improve our understanding of the diversity of metabolites produced by these species.…”

Section: Discussionmentioning

confidence: 99%

“…However, there may be both negative as well as positive allelopathic effects of different species depending upon crops consortiums. In this context, Rodrigues et al (2012) cited negative allelopathic effects of the extracts from U. brizantha and U. decumbens on the seed germination of Stylosanthes guianensis and of U. decumbens on the germination of Stylosanthes capitata; they also reported a positive allelopathic effect of U. brizantha on the seeds of Stylosanthes macrocephala. The exudates of U. humidicola roots inhibit nitrification by Nitrosomonas europaea bacteria because of the action of two compounds identified in a phytochemical study of this exudate: p-coumaric and ferulic acids.…”

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confidence: 99%

Special metabolites isolated from Urochloa humidicola (Poaceae)

Oliveira

Nepomuceno

Castro

et al. 2017

An. Acad. Bras. Ciênc.

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This study aims to identify special metabolites in polar extracts from Urochloa humidicola (synonym Brachiaria humidicola) that have allelopathic effects and induce secondary photosensitization in ruminants. The compounds were isolated and identified via chromatographic and spectroscopic techniques. The compounds 4-hydroxy-3-methoxy-benzoic acid, trans-4-hydroxycinnamic acid, and p-hydroxy-benzoic acid; the flavonols isorhamnetin-3-O-β-d-glucopyranoside and methyl quercetin-3-O-β-d-glucuronate; and kaempferitrin, quercetin-3-O-α-l-rhamnopyranoside, and tricin were identified in the extract from the leaves of Urochloa humidicola. Two furostanic saponins, namely, dioscin and 3-O-α-l-rhamnopyranosyl-(1-4)-[α-l-rhamnopyranosyl-(1-2)]-β-d-glucopyranosyl-penogenin, as well as catechin-7-O-β-dglucopyranoside were identified in the methanolic extract obtained from the roots of this plant. This species features a range of metabolites that may be toxic for animals if used in food and may interfere with the growth medium, thereby inhibiting the development of other species.

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Alelopatia de duas espécies de braquiária em sementes de três espécies de estilosantes

Abstract: IV Alelopatia de duas espécies de braquiária em sementes de três espécies de estilosantesAllelopathy of two brachiaria species in seeds of three species of stylosanthes

Cited by 14 publications

References 7 publications

Transposição do banco de sementes para restauração ecológica da floresta estacional no Rio Grande do Sul

Transposição do banco de sementes para restauração ecológica da floresta estacional no Rio Grande do Sul

Pequi leaves incorporated into the soil reduce the initial growth of cultivated, invasive and native species

Special metabolites isolated from Urochloa humidicola (Poaceae)

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