Efeito alelopático de Raphanus sativus em Urochloa decumbens e Lactuca sativa

Navas, Rafael; Pereira, María Renata Rocha

doi:10.18227/1982-8470ragro.v10i3.3555

Cited by 3 publications

(2 citation statements)

References 8 publications

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“…The latter, inhibited root growth significantly in the 50% and 75% concentrations ( Figure 3A). Navas and Pereira (2016) also reported decrease in the root growth of lettuce seedlings when exposed to the radish aqueous extract. The reduction in the maize seedling root system might be related to the presence of phenolic compounds (Table 1) The growth, the root system dry matter and shoot dry matter ( Figure 3B and Figures 4A-B), differently from what was observed int he root system length, was better adjusted by the second order polynomial model, in which the 25% concentration promoted increase in growth, root system dry matter and shoot dry matter.…”

Section: Maizementioning

confidence: 88%

Allelopathic potential from cover crops aqueous extract on weeds and maize

Reginatto

Bonome

Giovanetti

et al. 2020

RSD

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Cover crops are used as a strategy to recover degraded soils, improving their physical, chemical and biological characteristics, as well as assisting in the control of weeds through allelochemical compounds released by the shoot degradation process. This work aimed to evaluate the phytotoxicity of the aqueous extract of the cover crops Raphanus sativus L., Avena strigosa (Schreb) and Vicia villosa R. on the germination and initial growth of Zea mays, Amaranthus spinosus L. and Ipomoea grandifolia (Dammer) O'Donnell, as well as to identify and quantify the phenolic compounds present in the extract. Straws from the dried and crushed cover crops were used. The extracts were obtained by mixing 10% R. sativus and A. strigosa, and 12% V. villosa in distilled water (m/v). DIC was used, with four replications, in a 3x4 factorial scheme, with 3 cover crops (R. sativus, A. strigosa and V. villosa) and 4 concentrations (0%, 25%, 50% and 75%). The variables analyzed were: germination, germination speed index (GSI), seedling growth, root protrusion (RP), root protrusion speed index (RPSI) and dry mass of the root and shoot. Higher concentrations of the extracts affected the initial development of maize and weeds. The phenolic compounds identified in greater quantity were benzoic acid, p-coumaric acid, followed by ferulic acid and p-hydroxybenzoic acid. It is suggested that studies of the same nature be carried out in the field, since the interactions between soil microorganisms, climatic conditions can interfere with the results.

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Section: Maizementioning

confidence: 88%

Allelopathic potential from cover crops aqueous extract on weeds and maize

Reginatto

Bonome

Giovanetti

et al. 2020

RSD

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“…A alelopatia é resultado da interferência natural de compostos secundários liberados no meio ambiente, sendo que estes podem afetar uma planta direta ou indiretamente, resultando em efeitos danosos ou benéficos e, por isso, têm sido amplamente utilizada em benefício de culturas de interesse (MIRANDA et al, 2012;SILVA, 2012). A maioria dos compostos químicos provém do metabolismo secundário, que ocorre em diferentes partes da planta e que podem ser liberados no ambiente de diversas formas, estando amplamente relacionados aos mecanismos de defesa destas contra ataques de insetos, deficiência nutricional e reguladores vegetais (GUSMAN; YAMAGUSHI; VESTENA, 2011; MEDEIROS, 1990;NAVAS;PEREIRA, 2016).…”

Section: Introductionunclassified

Efeito Alelopático de Extratos Aquosos de Persea americana Mill. Sobre a Germinação e Desenvolvimento Inicial de Lactuca sativa L.

Oliveira

Rodrigues

Cardoso

et al. 2018

Ens Cien C Biol Agra Saúde

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O abacateiro é uma planta frutífera, de porte arbóreo, cultivada em diversas regiões do Brasil, sendo utilizado tanto como alimento quanto fitoterápico. Estudos recentes indicam que compostos químicos, considerados fitoterápicos, podem afetar a germinação de sementes e o desenvolvimento de plântulas. Neste contexto, objetivou-se com este estudo avaliar o efeito alelopático de extratos aquosos das folhas de Persea americana Mill (abacateiro) sobre a germinação e desenvolvimento inicial de alface (Lactuca sativa L.). O experimento foi realizado em câmara de germinação, utilizando extratos aquosos obtidos por meio de decocção e infusão, nas concentrações 4,0, 12,0 e 20,0 mg mL-1, e água destilada (controle), em delineamento inteiramente casualizado (DIC), com 4 repetições de 50 sementes cada. Para avaliar o potencial alelopático foram realizados os testes de Porcentagem de Germinação (PG), Primeira Contagem (PC), Índice de Velocidade de Germinação (IVG) e Tempo Médio de Germinação (TMG) das sementes, além do Comprimento da Parte Aérea (CPA) e Comprimento do Sistema Radicular (CSR) das plântulas da alface. Os dados obtidos foram submetidos à análise de variância pelo teste F e as médias comparadas pelo teste de Tukey a 5% de probabilidade. Os extratos interferiram, significativamente, no CPA e apresentaram interação significativa para as variáveis PC, PG e CPA, sendo que o decocto, quando comparado ao infuso, ambos na concentração 4 mg mL-1 estimulou o crescimento, diferindo estatisticamente do infuso e do controle negativo. Os resultados indicam que ambos os extratos podem ser utilizados como insumo biológico, sendo o infuso como bioherbicida e o decocto como biofertilizante. Palavras-chave: Abacateiro. Alelopatia. Metabólitos Secundários. AbstractAvocado is a fruitful, large-sized plant, grown in several regions of Brazil, used both as food and phytotherapy. Recent studies indicate that chemical compounds considered phytotherapic can affect seed germination and seedling development. In this context, the objective of this study was to evaluate the allelopathic effect of aqueous extracts of leaves of Persea americana Mill (avocado) on germination and initial development of lettuce (Lactuca sativa L.). The experiment was carried out in a germination chamber, using aqueous extracts obtained by means of decoction and infusion, at concentrations 4.0, 12.0 and 20.0 mg mL-1, and distilled water (control), in a completely randomized design (DIC), with 4 replicates of 50 seeds each. In order to evaluate the allelopathic potential, the Germination Percentage (PG), First Count (PC), Germination Speed Index (IVG) and Mean Germination Time (TMG) tests were performed in addition to the Aerial Part Length (CPA) and Root Length (CSR) of lettuce seedlings. The data were subjected to analysis of variance by the F test and the averages were compared by the Tukey test at 5% probability. The extracts interfered significantly in the CPA and presented significant interaction for the variables PC, PG and CPA, and the decoction, when compared to the infusion, in the concentration 4 mg mL-1, stimulated the growth, differing statistically from the infusion and control negative. The results indicate that both extracts can be used as biological inputs, being the infusion as bioherbicide and decoction as biofertilizer. Keywords: Avocado. Allelopathy. Secondary metabolites.

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From germination to seedling development: the effects of smoke on a native and an invasive grass species of the Cerrado

Sánchez

Dantas-Junior²,

Pôrto³

et al. 2022

Seed Sci. Res.

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The Brazilian Cerrado, a Neotropical savanna, is a fire-prone ecosystem where the ground layer biomass consists mainly of graminoids. However, as for other savannas, the effects of fire cues (such as smoke) on Cerrado grasses do not present a clear pattern, either for germination or seedling development. Smoke can stimulate different stages of the plant life cycle, which can alter the community and invasion processes. So far, most research on the subject focuses on germination, not addressing post-germinative phases, a sensitive stage of plant development. Here, we investigated the effect of smoke on a native (Echinolaena inflexa) and an invasive (Urochloa decumbens) grass species common in the Cerrado. We analysed germinative parameters and seedling mass and length after exposing the seeds to dry smoke for 5, 10, 15 or 20 min. Seedling development was assessed by measuring shoot and root systems after cultivating germinated seeds for 3, 7 or 15 d. Smoke did not affect germination percentages. However, fumigation reduced the mean germination time of both species and the germination onset of E. inflexa. U. decumbens had higher length values in all periods of cultivation, whereas mass values only surpassed that of E. inflexa at 15 d. Smoke exposure reduced the aboveground length of 7-d seedlings of U. decumbens, and mass of 15-d plants of both species. Also, smoke enhanced the root investment of the native and invasive species in different cultivation periods. Therefore, studying post-germinative parameters on seedling development may bring further insights into the smoke effects.

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Efeito alelopático de Raphanus sativus em Urochloa decumbens e Lactuca sativa

Cited by 3 publications

References 8 publications

Allelopathic potential from cover crops aqueous extract on weeds and maize

Allelopathic potential from cover crops aqueous extract on weeds and maize

Efeito Alelopático de Extratos Aquosos de Persea americana Mill. Sobre a Germinação e Desenvolvimento Inicial de Lactuca sativa L.

From germination to seedling development: the effects of smoke on a native and an invasive grass species of the Cerrado

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