Efeitos alelopaticos de alguns extratos vegetais na germinação do tomateiro (Lycopersicon esculentum Mill. cv. Santa Cruz)

Castro, Paulo R. C.; Rodrigues, João Domingos; Moraes, Fernando; Carvalho, Valter

doi:10.1590/s0100-83581983000200001

Cited by 17 publications

(19 citation statements)

References 7 publications

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“…Recent results by Sobrero et al (2004) confirm the reports of other authors (Bonasera et al, 1979;Castro et al, 1983;Pope & Thompson, 1984;Rice, 1984;Alves et al, 1986) on allelopathic potential of W. glauca, considerably steeper higher in leaves, which have a marked inhibition on germination and growth of the radicle of species Lycopersicum esculentum (tomato), Cucumis sativus (cucumber) and Raphanus sativus (radish). Figure 4 show that a residue of S. trilobata does not affect the germination of onions, …”

Section: Resultssupporting

confidence: 82%

Allelopathic Influence of Residues from Sphagneticola trilobata on Weeds and Crops

et al. 2016

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-The allelopathic effect studied in many cultures has currently generated great expectations that displayed a natural and environmentally friendly tool for weed management using bioherbicides. The objective of this work was to assess allelopathic influence of residues of S. trilobata on the germination and growth of weeds, as well as their relation with some crops and effects on soil properties. Results show that residues from S. trilobata have inhibited the germination of weeds (31.6 -72%), increasingly with the applied dose. All residue doses of this specie have inhibited dicotyledonous germination, but only maximum concentration has affected monocotyledons. The residues did not affect onion germination, but stimulated it in radish and tomato, while the dose applied at 50% produced tomato stimulation and inhibition of cabbage. The effects of residues on hypocotyl growth in different crops showed changes in species response. For onion, the three doses had negative effects on the growth of hypocotyl, while tomato was stimulated. For radish, the growth was hindered by any dose applied, and were only different (50 and 100%) compared to control. For cabbage, only hypocotyl length was stimulated, when maximum dose (100%) was applied. For the radicle growth, in onion and radish no differences were found compared to control. While the tomato radicle growth was inhibited, in cabbage, all doses encouraged the elongation of the radicle. The dry mass of weed was affected by increased dose of residue (0.49 -8.8 g m -2 ), however the soil microflora was stimulated, while the population of Azotobacter spp. was not affect. Some soil properties were affected, the level of organic material, Na+ and electrical conductivity were increased, while pH (H 2 O) decreased a bit, however it remained basic. Keywords: allelopathy, residues, Azotobacter, soil microflora. (31,6 -72%) RESUMO -Atualmente, o efeito alelopático estudado em muitas culturas tem gerado grandes expectativas que exibiam uma ferramenta natural e ambientalmente amigável para manejo de plantas daninhas usando os bioherbicidas. O objetivo deste trabalho foi avaliar a influência alelopático de resíduos de S. trilobata na germinação e crescimento de ervas daninhas, bem como sua relação com algumas culturas e os efeitos sobre as propriedades do solo. Os resultados mostram, que os resíduos de S. trilobata produziram uma inibição da germinação das ervas daninhas

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Section: Resultssupporting

confidence: 82%

Allelopathic Influence of Residues from Sphagneticola trilobata on Weeds and Crops

et al. 2016

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“…Além disso, Chiapusio et al (1997) indicam que, apesar de a porcentagem de germinação ser um índice muito utilizado, a mesma não evidencia outros aspectos do processo germinativo, por englobar apenas resultados finais, ignorando atrasos ou períodos inativos de germinação durante o bioensaio.…”

Section: Resultdos E Discussãounclassified

“…Comunidades, dominância e sucessão vegetais, tanto quanto manejo e produtividade de culturas, são afetados pelos efeitos alelopáticos de certas espécies, que utilizam este mecanismo de defesa para sua sobrevivência e estabelecimento no local (CHOU, 1986). Sendo assim, várias pesquisas são feitas sobre este mecanismo, utilizando espécies de interesse econômico, como o tomate (CASTRO et al, 1983;GORLA;PEREZ, 1997;GUSMAN;BITTENCOURT;VESTENA, 2008).…”

Section: Introductionunclassified

Atividade alelopática dos extratos fresco e seco de folhas de barbatimão (Stryphnodendron adstringens (Mart.) Coville) e pata-devaca (Bauhinia forficata link) sobre a germinação e desenvolvimento inicial de plântulas de tomate

et al. 2009

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ResumoO trabalho teve por objetivo verificar a ação alelopática de pata-de-vaca (Bauhinia forficata Link), e barbatimão (Stryphnodendron adstringens (Mart.) Coville) em sementes de tomate (Lycopersicum esculentum Mill). As sementes de tomate foram tratadas com extratos aquosos preparados a partir de folhas frescas e secas das espécies-teste nas concentrações de 100%, 75%, 50%, 25% e 0% (controle) e acondicionadas em 'gerbox' transparente. O delineamento experimental foi inteiramente casualizado, com cinco tratamentos e cinco repetições de 25 sementes por parcela por espécie-teste. Foram avaliados porcentagem, tempo e velocidade médios de germinação e, comprimento médio de raiz primária. Os dados foram submetidos à análise de variância e as médias comparadas por Tukey a 5% de probabilidade. Não houve diferença em relação à porcentagem de germinação das sementes de tomate para os diferentes tipos de extrato. Em relação à velocidade média de germinação (VMG) todos os tratamentos com extrato foliar fresco diferiram da testemunha. O TMG e a VMG apresentaram diferenças em relação ao extrato de folhas secas nas concentrações 25%, 75% e 100%. Todos os tratamentos apresentaram efeito inibitório sobre o comprimento da raiz primária. Palavras-chave: Alelopatia, sementes, inibição AbstractThe objective of this study aimed at the verification of the allelopatic action of extracts of "pata-devaca" (Bauhinia forficata Link) and "barbatimão" (Stryphnodendron adstringens (Mart.) Coville) on seeds of tomato (Lycopersicum esculentum Mill). Tomato seeds placed in translucent "gerbox" were treated with aqueous extracts prepared with fresh and dry leaves of the tested species at the following concentrations: 100%, 75%, 50%, 25%, and 0% (control). The experimental design was completely randomized with five treatments and five replications of 25 seeds per plot per species. The data were submitted to the analysis of variance and the means compared by Tukey test at 5% of probability. Germination percentage, mean time and germination rates (MGT and MGR), and mean of the primary

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“…Similares resultados fueron indicados por Castro et al (1983) quienes apreciaron inhibición total de la germinación de las semillas de tomate (Lycopersicon esculentum Mill.) cv.…”

Section: Efecto De Los Extractos Sobre La Germinaciónunclassified

Efectos de extractos acuosos de la maleza Cyperus rotundus L. (Cyperaceae) sobre la germinación de semillas y crecimiento de plántulas de maíz ( Zea mays L.) cv. Pioneer 3031

Laynez-Garsaball

Méndez-Natera

2007

Rev peru biol

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Efectos de extractos acuosos de la malezaUn primer extracto al 15% p/v fue preparado con el follaje de plantas mays de C. rotundus de 15 días, se dejó reposar por 48 h y luego se obtuvo por dilución extractos al 0; 2,0; 4,0 y 6,0% p/v evaluándoseles pH y conductividad eléctrica (S.cm -1 ). Para la siembra se utilizaron bandejas cubiertas con una doble capa de papel absorbente sobre la que se colocó 20 semillas/bandeja, tapadas con dos hojas más de papel y regadas tres veces al día con los extractos foliares. El tratamiento control recibió agua corriente. El diseño estadístico fue bloques al azar con cuatro concentraciones de extracto y cinco repeticiones. A los 12 días después de la siembra se determinaron los diferentes parámetros de germinación y crecimiento. Se práctico un análisis de varianza y regresión para los parámetros estudiados. El pH disminuyó y la CE incrementó al aumentar la concentración del extracto. La germinación, altura de las plántulas, longitud de las radículas, peso seco del vástago y relación peso seco del vástago/peso seco de la radícula disminuyeron proporcionalmente al aumento de la concentración de extracto, contrariamente, el peso seco de la radícula incrementó. La relación altura de la plántula/longitud de la radícula no presentó diferencias signifi cativas en las fuentes de variación. Palabras Claves: Cyperus rotundus, extractos acuosos, Zea mays, alelopatía AbstractThe objective of this experiment was to determine the effects of foliage water extracts of purple nutsedge (Cyperus rotundus L.) on seed germination and seedling growth of corn ( Cyperus rotundus L.) on seed germination and seedling growth of corn ( Cyperus rotundus Zea mays L.) cv. Pioneer 3031. An extract was prepared with nutsedge foliage of 15 days at 15% w/v and for dilution, extracts of 2, 4 and 6% w/v were prepared, pH and electric conductivity (S.cm -1 ) were determined. Distilled water was uses as a control. Twenty seeds were sowed in a double layer of absorbent paper on trays, covered with two leaves of absorbent paper and they were watered three times per day using foliage extracts. A randomized complete block design was used with four extract concentrations (0, 2, 4 y 6% w/v) and fi ve replications. The traits were determined twelve days after sowing. An analysis of variance and regression were applied. The pH diminished and the electrical conductivity increased when concentration of extract increased. The germination, seedling height, radicle length, dry shoot weight and the relationship dry shoot weight/dry radicle weight decreased proportionally with increased extract concentration, contrarily, dry radicle weight was increased. Relationship seedling height/radicle length was not affected by the extracts.

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Efeitos alelopaticos de alguns extratos vegetais na germinação do tomateiro (Lycopersicon esculentum Mill. cv. Santa Cruz)

Cited by 17 publications

References 7 publications

Allelopathic Influence of Residues from Sphagneticola trilobata on Weeds and Crops

Allelopathic Influence of Residues from Sphagneticola trilobata on Weeds and Crops

Atividade alelopática dos extratos fresco e seco de folhas de barbatimão (Stryphnodendron adstringens (Mart.) Coville) e pata-devaca (Bauhinia forficata link) sobre a germinação e desenvolvimento inicial de plântulas de tomate

Efectos de extractos acuosos de la maleza Cyperus rotundus L. (Cyperaceae) sobre la germinación de semillas y crecimiento de plántulas de maíz ( Zea mays L.) cv. Pioneer 3031

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