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Pesquisa : A18.400 [Categoria DeCS]
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Id: biblio-974282
Autor: Santos, Alexandra de Andrade; Silveira, Joaquim Albenísio Gomes da; Guilherme, Eliezer de Araujo; Bonifacio, Aurenivia; Rodrigues, Artenisa Cerqueira; Figueiredo, Márcia do Vale Barreto.
Título: Changes induced by co-inoculation in nitrogen-carbon metabolism in cowpea under salinity stress
Fonte: Braz. j. microbiol;49(4):685-694, Oct.-Dec. 2018. tab, graf.
Idioma: en.
Resumo: ABSTRACT To mitigate the deleterious effects of abiotic stress, the use of plant growth-promoting bacteria along with diazotrophic bacteria has been increasing. The objectives of this study were to investigate the key enzymes related to nitrogen and carbon metabolism in the biological nitrogen fixation process and to elucidate the activities of these enzymes by the synergistic interaction between Bradyrhizobium and plant growth-promoting bacteria in the absence and presence of salt stress. Cowpea plants were cultivated under axenic conditions, inoculated with Bradyrhizobium and co-inoculated with Bradyrhizobium sp. and Actinomadura sp., Bradyrhizobium sp. and Bacillus sp., Bradyrhizobium sp. and Paenibacillus graminis, and Bradyrhizobium sp. and Streptomycessp.; the plants were also maintained in the absence (control) and presence of salt stress (50 mmolL-1 NaCl). Salinity reduced the amino acids, free ammonia, ureides, proteins and total nitrogen content in nodules and increased the levels of sucrose and soluble sugars. The co-inoculations responded differently to the activity of glutamine synthetase enzymes under salt stress, as well as glutamate synthase, glutamate dehydrogenase aminating, and acid invertase in the control and salt stress. Considering the development conditions of this experiment, co-inoculation with Bradyrhizobium sp. and Bacillus sp. in cowpea provided better symbiotic performance, mitigating the deleterious effects of salt stress.
Descritores: Carbono/metabolismo
Cloreto de Sódio/metabolismo
Vigna/metabolismo
Nitrogênio/metabolismo
-Microbiologia do Solo
Cloreto de Sódio/análise
Actinobacteria/fisiologia
Raízes de Plantas/crescimento & desenvolvimento
Raízes de Plantas/metabolismo
Raízes de Plantas/microbiologia
Bradyrhizobium/fisiologia
Inoculantes Agrícolas/fisiologia
Vigna/crescimento & desenvolvimento
Vigna/microbiologia
FRONTAL LOBE0
Aminoácidos/metabolismo
Fixação de Nitrogênio
Responsável: BR1.1 - BIREME


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Id: biblio-974339
Autor: Ribeiro, Vitória Palhares; Marriel, Ivanildo Evódio; Sousa, Sylvia Morais de; Lana, Ubiraci Gomes de Paula; Mattos, Bianca Braz; Oliveira, Christiane Abreu de; Gomes, Eliane Aparecida.
Título: Endophytic Bacillus strains enhance pearl millet growth and nutrient uptake under low-P
Fonte: Braz. j. microbiol;49(supl.1):40-46, 2018. tab.
Idioma: en.
Projeto: Fapemig; . MPCPAgro; . Embrapa.
Resumo: Abstract Bacterial endophytes are considered to have a beneficial effect on host plants, improving their growth by different mechanisms. The objective of this study was to investigate the capacity of four endophytic Bacillus strains to solubilize iron phosphate (Fe-P), produce siderophores and indole-acetic acid (IAA) in vitro, and to evaluate their plant growth promotion ability in greenhouse conditions by inoculation into pearl millet cultivated in a P-deficient soils without P fertilization, with Araxá rock phosphate or soluble triple superphosphate. All strains solubilized Fe-P and three of them produced carboxylate-type siderophores and high levels of IAA in the presence of tryptophan. Positive effect of inoculation of some of these strains on shoot and root dry weight and the N P K content of plants cultivated in soil with no P fertilization might result from the synergistic combination of multiple plant growth promoting (PGP) traits. Specifically, while B1923 enhanced shoot and root dry weight and root N P content of plants cultivated with no P added, B2084 and B2088 strains showed positive performance on biomass production and accumulation of N P K in the shoot, indicating that they have higher potential to be microbial biofertilizer candidates for commercial applications in the absence of fertilization.
Descritores: Bacillus/metabolismo
Alimentos/metabolismo
Pennisetum/crescimento & desenvolvimento
Pennisetum/microbiologia
Endófitos/metabolismo
Ácidos Indolacéticos/metabolismo
-Fosfatos/análise
Fosfatos/metabolismo
Bacillus/genética
Sideróforos/metabolismo
Raízes de Plantas/crescimento & desenvolvimento
Raízes de Plantas/metabolismo
Raízes de Plantas/microbiologia
Pennisetum/metabolismo
Endófitos/genética
Ferro/metabolismo
Responsável: BR1.1 - BIREME


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Id: lil-788975
Autor: Orhan, Furkan.
Título: Alleviation of salt stress by halotolerant and halophilic plant growth-promoting bacteria in wheat (Triticum aestivum)
Fonte: Braz. j. microbiol;47(3):621-627, July-Sept. 2016. tab, graf.
Idioma: en.
Resumo: ABSTRACT In the current study, 18 halotolerant and halophilic bacteria have been investigated for their plant growth promoting abilities in vitro and in a hydroponic culture. The bacterial strains have been investigated for ammonia, indole-3-acetic acid and 1-aminocyclopropane-1-carboxylate-deaminase production, phosphate solubilisation and nitrogen fixation activities. Of the tested bacteria, eight were inoculated with Triticum aestivum in a hydroponic culture. The investigated bacterial strains were found to have different plant-growth promoting activities in vitro. Under salt stress (200 mM NaCl), the investigated bacterial strains significantly increased the root and shoot length and total fresh weight of the plants. The growth rates of the plants inoculated with bacterial strains ranged from 62.2% to 78.1%.Identifying of novel halophilic and halotolerant bacteria that promote plant growth can be used as alternatives for salt sensitive plants. Extensive research has been conducted on several halophilic and halotolerant bacterial strains to investigate their plant growth promoting activities. However, to the best of my knowledge, this is the first study to inoculate these bacterial strains with wheat.
Descritores: Reguladores de Crescimento de Planta/biossíntese
Estresse Fisiológico
Bactérias/efeitos dos fármacos
Bactérias/metabolismo
Triticum/fisiologia
Triticum/microbiologia
Fenômenos Fisiológicos Bacterianos
Salinidade
-Fenótipo
Raízes de Plantas/fisiologia
Raízes de Plantas/microbiologia
Biomassa
Amônia/metabolismo
Fixação de Nitrogênio
Responsável: BR1.1 - BIREME


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Id: lil-780827
Autor: Souza, Tancredo Augusto Feitosa de; Rodriguez-Echeverría, Susana; Andrade, Leonaldo Alves de; Freitas, Helena.
Título: Arbuscular mycorrhizal fungi in Mimosa tenuiflora (Willd. ) Poir from Brazilian semi-arid
Fonte: Braz. j. microbiol;47(2):359-366, Apr.-June 2016. tab, graf.
Idioma: en.
Resumo: Abstract Many plant species from Brazilian semi-arid present arbuscular mycorrhizal fungi (AMF) in their rhizosphere. These microorganisms play a key role in the establishment, growth, survival of plants and protection against drought, pathogenic fungi and nematodes. This study presents a quantitative analysis of the AMF species associated with Mimosa tenuiflora, an important native plant of the Caatinga flora. AMF diversity, spore abundance and root colonization were estimated in seven sampling locations in the Ceará and Paraíba States, during September of 2012. There were significant differences in soil properties, spore abundance, percentage of root colonization, and AMF diversity among sites. Altogether, 18 AMF species were identified, and spores of the genera Acaulospora, Claroideoglomus, Dentiscutata, Entrophospora, Funneliformis, Gigaspora, Glomus, Racocetra, Rhizoglomus and Scutellospora were observed. AMF species diversity and their spore abundance found in M. tenuiflora rhizosphere shown that this native plant species is an important host plant to AMF communities from Brazilian semi-arid region. We concluded that: (a) during the dry period and in semi-arid conditions, there is a high spore production in M. tenuiflora root zone; and (b) soil properties, as soil pH and available phosphorous, affect AMF species diversity, thus constituting key factors for the similarity/dissimilarity of AMF communities in the M. tenuiflora root zone among sites.
Descritores: Micorrizas/isolamento & purificação
Mimosa/microbiologia
Fungos/isolamento & purificação
-Estações do Ano
Microbiologia do Solo
Esporos Fúngicos/isolamento & purificação
Esporos Fúngicos/classificação
Esporos Fúngicos/crescimento & desenvolvimento
Esporos Fúngicos/genética
Brasil
Raízes de Plantas/microbiologia
Micorrizas/classificação
Micorrizas/crescimento & desenvolvimento
Micorrizas/genética
Biodiversidade
Fungos/classificação
Fungos/crescimento & desenvolvimento
Fungos/genética
Responsável: BR1.1 - BIREME


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Id: biblio-1049114
Autor: Nóbrega, Daiane da Silva; Peixoto, José Ricardo; Vilela, Michelle Souza; Nóbrega, Anne Kelly da Silva; Santos, Elaine Caetano; Costa, Anne Pinheiro; Carmona, Ricardo.
Título: Yield and soil insect resistance in sweet potato clones / Produtividade e resistência de clones de batata-doce aos insetos de solo
Fonte: Biosci. j. (Online);35(6):1773-1779, nov./dec. 2019. tab.
Idioma: en.
Resumo: Sweet potato (Ipomoea batatas) is a rustic horticultural crop with high production potential. However, the crop is susceptible to many pests and diseases. The objective of this study was to evaluate 10 genotypes of sweet potato regarding their yield and resistance to soil insects, under Brazilian cerrado soil conditions. Genotypes were selected from the Sweet Potato Germplasm Bank of Embrapa Hortaliças. The experiment was conducted at Água Limpa Farm, belonging to University of Brasilia (UnB), and consisted of a randomized block design, with 10 treatments (genotypes), 10 plants per plot, and four replications. The following traits were analyzed: number of perforations per root, incidence of roots injured by insects, plant resistance degree, root shape, total and marketable root yields, root peel color, root pulp color, pulp total soluble solids, pulp titratable acidity, pulp TSS/TA ratio, pulp moisture, and pulp starch yield. Genotype CNPH 53 (26.78 t ha-1) presented total root yield greater than the commercial variety Brazlândia Rosada (17.54 t ha-1). Genotype Santa Sofia (11.77 t ha-1) and Brazlândia (13.5 t ha-1) had similar marketable root yields. CNPH 53 showed the best agronomic performance, exhibiting moderate susceptibility to soil insects and root shape meeting the market standards. It also had low pulp TA (2.53%); high pulp TSS (12.25 °Brix) and pulp TSS/AT ratio (4.24); pulp moisture content close to 70%; and the highest pulp starch content (11.98%). The traits number of perforations per root, root shape, and pulp TA presented heritability values close to 70%. Marketable root yield, pulp moisture, and pulp starch content demonstrated heritability values greater than 90% and CVG/CVE greater than 1

A batata-doce (Ipomoea batatas) é uma hortícola rústica e de elevado potencial produtivo. No entanto, ainda é suscetível a grande número de pragas e doenças. O objetivo deste trabalho foi avaliar dez genótipos de batata-doce quanto à produtividade e resistência a insetos de solo nas condições de solo do cerrado Brasileiro. Os genótipos avaliados foram selecionados do Banco de Germoplasma da Embrapa Hortaliças. O experimento foi conduzido na Fazenda Água Limpa da Universidade de Brasília (UnB) utilizando delineamento experimental de blocos casualizados, com 10 tratamentos, 4 repetições e 10 plantas de batata-doce por parcela. As características avaliadas foram: número de furos por raiz, incidência de danos causados por insetos, grau de resistência da planta, formato de raiz, cor da casca da raiz, cor da polpa da raiz, produtividade total e comercial de raiz, e teor de sólidos solúveis totais (SST), acidez total titulável (AT), STT/AT, rendimento de amido e umidade da polpa. O genótipo CNPH 53 apresentou produtividade total (26,78 t ha-1) superior à variedade comercial Brazlândia Rosada (17,54 t ha-1). O genótipo Santa Sofia obteve produtividade comercial (11,77 t ha-1) próxima à variedade Brazlândia Rosada (13,75 t ha-1). O genótipo CNPH 53 apresentou o melhor desempenho agronômico, exibindo suscetibilidade moderada aos insetos de solo e formato de raiz dentro dos padrões comerciais. Apresentou também baixa acidez (2,53%); alto teor de sólidos solúveis (12,25 °Brix) e de ratio (4,24); teor de umidade da polpa próximo a 70% e maior teor de amido na polpa (11,98%). As características número de furos, formato e acidez apresentaram valores de herdabilidade próximos de 70%. A produtividade comercial, umidade e amido da polpa demonstraram valores de herdabilidade acima de 90% e CVg/CVe maior que 1
Descritores: Raízes de Plantas
Pragas da Agricultura
Ipomoea batatas
Melhoramento Vegetal
Responsável: BR396.1 - Biblioteca Central


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Id: biblio-839377
Autor: Chauhan, Anjali; Guleria, Shiwani; Balgir, Praveen P; Walia, Abhishek; Mahajan, Rishi; Mehta, Preeti; Shirkot, Chand Karan.
Título: Tricalcium phosphate solubilization and nitrogen fixation by newly isolated Aneurinibacillus aneurinilyticus CKMV1 from rhizosphere of Valeriana jatamansi and its growth promotional effect
Fonte: Braz. j. microbiol;48(2):294-304, April.-June 2017. tab, graf.
Idioma: en.
Resumo: Abstract Aneurinibacillus aneurinilyticus strain CKMV1 was isolated from rhizosphere of Valeriana jatamansi and possessed multiple plant growth promoting traits like production of phosphate solubilization (260 mg/L), nitrogen fixation (202.91 nmol ethylene mL-1 h-1), indole-3-acetic acid (IAA) (8.1 µg/mL), siderophores (61.60%), HCN (hydrogen cyanide) production and antifungal activity. We investigated the ability of isolate CKMV1 to solubilize insoluble P via mechanism of organic acid production. High-performance liquid chromatography (HPLC) study showed that isolate CKMV1 produced mainly gluconic (1.34%) and oxalic acids. However, genetic evidences for nitrogen fixation and phosphate solubilization by organic acid production have been reported first time for A. aneurinilyticus strain CKMV1. A unique combination of glucose dehydrogenase (gdh) gene and pyrroloquinoline quinone synthase (pqq) gene, a cofactor of gdh involved in phosphate solubilization has been elucidated. Nitrogenase (nif H) gene for nitrogen fixation was reported from A. aneurinilyticus. It was notable that isolate CKMV1 exhibited highest antifungal against Sclerotium rolfsii (93.58%) followed by Fusarium oxysporum (64.3%), Dematophora necatrix (52.71%), Rhizoctonia solani (91.58%), Alternaria sp. (71.08%) and Phytophthora sp. (71.37%). Remarkable increase was observed in seed germination (27.07%), shoot length (42.33%), root length (52.6%), shoot dry weight (62.01%) and root dry weight (45.7%) along with NPK (0.74, 0.36, 1.82%) content of tomato under net house condition. Isolate CKMV1 possessed traits related to plant growth promotion, therefore, could be a potential candidate for the development of biofertiliser or biocontrol agent and this is the first study to include the Aneurinibacillus as PGPR.
Descritores: Reguladores de Crescimento de Planta/metabolismo
Valeriana/microbiologia
Fosfatos de Cálcio/metabolismo
Lycopersicon esculentum/crescimento & desenvolvimento
Bacillales/isolamento & purificação
Fixação de Nitrogênio
-Microbiologia do Solo
Cromatografia Líquida de Alta Pressão
Lycopersicon esculentum/microbiologia
Raízes de Plantas/microbiologia
Biomassa
Bacillales/metabolismo
Rizosfera
Fungos/crescimento & desenvolvimento
Antibiose
Responsável: BR1.1 - BIREME


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Id: biblio-839367
Autor: Santos, Silvana Gomes dos; Silva, Paula Renata Alves da; Garcia, Andres Calderin; Zilli, Jerri Édson; Berbara, Ricardo Luis Louro.
Título: Dark septate endophyte decreases stress on rice plants
Fonte: Braz. j. microbiol;48(2):333-341, April.-June 2017. tab, graf.
Idioma: en.
Projeto: Embrapa; . Fundação de Amparo à Pesquisa no Estado do Rio de Janeiro; . National Council for Scientific and Technological Development; . Fundação de Amparo à Pesquisa de Minas Gerais.
Resumo: Abstract Abiotic stress is one of the major limiting factors for plant development and productivity, which makes it important to identify microorganisms capable of increasing plant tolerance to stress. Dark septate endophytes can be symbionts of plants. In the present study, we evaluated the ability of dark septate endophytes isolates to reduce the effects of water stress in the rice varieties Nipponbare and Piauí. The experiments were performed under gnotobiotic conditions, and the water stress was induced with PEG. Four dark septate endophytes were isolated from the roots of wild rice (Oryza glumaepatula) collected from the Brazilian Amazon. Plant height as well as shoot and root fresh and dry matter were measured. Leaf protein concentrations and antioxidant enzyme activity were also estimated. The dark septate endophytes were grown in vitro in Petri dishes containing culture medium; they exhibited different levels of tolerance to salinity and water stress. The two rice varieties tested responded differently to inoculation with dark septate endophytes. Endophytes promoted rice plant growth both in the presence and in the absence of a water deficit. Decreased oxidative stress in plants in response to inoculation was observed in nearly all inoculated treatments, as indicated by the decrease in antioxidant enzyme activity. Dark septate endophytes fungi were shown to increase the tolerance of rice plants to stress caused by water deficiency.
Descritores: Oryza/fisiologia
Oryza/microbiologia
Estresse Fisiológico
Desidratação
Endófitos/crescimento & desenvolvimento
-Proteínas de Plantas/análise
Oryza/enzimologia
Brasil
Raízes de Plantas/microbiologia
Endófitos/isolamento & purificação
Antioxidantes/análise
Responsável: BR1.1 - BIREME


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Id: biblio-839361
Autor: Torres-Arias, Yamir; Fors, Rosalba Ortega; Nobre, Camila; Gómez, Eduardo Furrazola; Berbara, Ricardo Luis Louro.
Título: Production of native arbuscular mycorrhizal fungi inoculum under different environmental conditions
Fonte: Braz. j. microbiol;48(1):87-94, Jan.-Mar. 2017. tab, graf.
Idioma: en.
Resumo: Abstract In order to obtain an arbuscular mycorrhizal fungi (AMF) native inoculum from Sierra de Moa and determine the most appropriate conditions for its big scale production, four light and temperature combinations were tested in three plant species (Calophyllum antillanum, Talipariti elatum and Paspalum notatum). Growth and development parameters, as well as the mycorrhizal functioning of the seedlings were evaluated. The natural light treatment under high temperatures (L-H) was the most suitable for the growth and development of the three plant species, showing the highest total biomass values, mainly of root, and a positive root-shoot ratio balance. This treatment also promoted higher values of root mycorrhizal colonization, external mycelium and AMF spore density. A total of 38 AMF species were identified among the plants and environmental conditions tested. Archaeospora sp.1, Glomus sp.5, Glomus brohultii and G. glomerulatum were observed in all the treatments. The L-H condition can be recommended for native inoculum production, as it promotes a better expression of the AM symbiosis and an elevated production of mycorrhizal propagules.
Descritores: Raízes de Plantas/microbiologia
Micorrizas
Meio Ambiente
-Microbiologia do Solo
Esporos Fúngicos
Simbiose
Contagem de Colônia Microbiana
Micorrizas/crescimento & desenvolvimento
Plântula/crescimento & desenvolvimento
Plântula/microbiologia
Responsável: BR1.1 - BIREME


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Id: biblio-1048933
Autor: Chen, Li Hsien; Chen, I Chia; Chen, Pei Yen; Huang, Ping Hsin.
Título: Efficacy of green onion root extract in cosmetics and skin care products / Eficácia do extrato de raiz de cebola verde em cosméticos e produtos de cuidado da pele
Fonte: Biosci. j. (Online);35(4):1276-1289, july/aug. 2019. ilus, tab, graf.
Idioma: en.
Resumo: In this study, leftover roots of Sansing green onions grown without toxic chemicals in Sansing Township, Ilan County, Taiwan were used as a raw material of skincare products. The raw material was extracted from the green onion roots by ultrasound in a low-temperature, safe and pollution-free environment. We hope to develop cleansers and other facial care products made of this natural, environmentally friendly, safe and affordable raw material so that people with sensitive skin can also use these products. We also hope that this study can contribute to circular economy and achieve the goal of green innovation by recycling the leftover roots. In terms of anti-oxidation, the DPPH free radical scavenging ability of 2.5 mg/mL green onion root extract was equivalent to 98% of that of 1 mg/mL BHT; the Fe2+ chelating ability was equivalent to 87.0% of that of 0.02 mg/mL EDTA; the superoxide anions scavenging ability of 2.5 mg/mL green onion root extract was equivalent to 84.2% of that of 1 mg/mL BHT and 80.4% of that of 0.05 mg/mL vitamin C. With respect to melanin synthesis inhibition, the green onion root extract's ability to inhibit dopachrome, the intermediate product of melanin, was positively correlated to its concentration, i.e., the higher the concentration of the green onion root extract, the better the inhibition ability. The IC50 of green onion root extract was 1.83 mg/mL, while, for comparison, the IC50 of vitamin C was 0.62 mg/mL. Furthermore, according to the cell survival assay, no obvious cytotoxic effect was found with the increase in the concentration of the green onion root extract. The whitening effect improved after 30 days of test. The improvement rate was 5.6% for 2.5 mg/mL green onion root extract, 3.1% for 1.25 mg/mL extract, and 1.7% for 0.625 mg/mL extract. The moisture retention also improved after 30 days of test. The moisture retention improvement rate was 22.7% for 2.5 mg/mL green onion root extract, 21.6% for 1.25 mg/mL extract, and 15.4% for 0.625 mg/mL extract. Based on the experiments, the green onion root extract obtained from ultrasound not only did not cause skin allergy and irritation but also showed anti-aging, melanin synthesis inhibition, whitening and moisture retention effects. The results showed that the green onion root extract can improve the moisture retention and whitening effect of the mask.

Neste estudo, restos de raízes de cebolinhas Sansing, cultivadas sem produtos químicos tóxicos no município de Sansing, Condado de Ilan, Taiwan, foram utilizadas como matéria-prima de produtos para a pele. A matéria-prima foi extraída das raízes de cebolinha por ultrassom em um ambiente de baixa temperatura, seguro e livre de poluição. Esperamos desenvolver produtos de limpeza e outros produtos para cuidados faciais produzidos com essa matéria-prima natural, ecologicamente correta, segura e acessível, para Improvement rate (%) Moisture retention Whitening effect 7.65 1.29 que pessoas com pele sensível também possam usar esses produtos. Também esperamos que este estudo possa contribuir para a economia circular e alcançar o objetivo da inovação ecológica, reciclando restos das raízes. Em termos de anti-oxidação, a capacidade de sequestro do radical livre DPPH de 2,5 mg/mL de extrato de raiz de cebolinha foi equivalente a 98% de 1 mg/mL de BHT; a capacidade quelante do Fe2+ foi equivalente a87,0% de 0,02 mg/mL de EDTA; a capacidade de sequestro de ânions superóxidos de 2,5 mg/mL de extrato de raiz de cebolinha foi equivalente a 84,2% de 1 mg/mL BHT e 80,4% de 0,05 mg/mL de vitamina C. No que diz respeito à inibição da síntese de melanina, a capacidade do extrato de raiz de cebolinha de inibir o dopacrômio, o metabolito intermediário de melanina, foi positivamente correlacionada com a sua concentração, ou seja, quanto maior a concentração do extrato de raiz de cebolinha, maior a capacidade de inibição. O IC50 de extrato de raiz de cebolinha foi de 1,83 mg/mL, enquanto que, por comparação, o IC50 de vitamina C foi de 0,62mg/mL. Além disso, de acordo com o ensaio de sobrevivência celular, nenhum efeito citotóxico foi observado com o aumento da concentração do extrato de raiz de cebolinha. O efeito de branqueamento melhora após 30 dias de ensaio. A melhoria foi de 5,6% para 2,5 mg/mL de extrato de raiz de cebolinha, 3,1% para 1,25 mg/mL de extrato e 1,7% para 0,625 mg/mL de extrato. A retenção de umidade também melhorou depois de 30 dias de teste. A taxa de melhoria de retenção de umidade foi de 22,7% para 2,5 mg/mL de extrato de raiz de cebolinha, 21,6% para 1,25 mg/mL de extrato, e 15,4% para 0,625 mg/mL de extrato.Com base nas experiências efetuadas, o extrato de raiz de cebolinha obtida por ultrassom não só não causa alergia nem irritação da pele, mas também demonstrou atividade anti-envelhecimento, inibição da síntese de melanina, capacidade de branqueamento e retenção de umidade. Os resultados mostraram que o extrato de raiz de cebolinha pode melhorar a retenção de umidade e efeito de branqueamento da máscara.
Descritores: Raízes de Plantas
Cebolas
-Cosméticos
Antioxidantes
Responsável: BR396.1 - Biblioteca Central


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Id: biblio-1048564
Autor: Shahzad, Haroon; Iqbal, Muhammad; Bashir, Safdar; Farooq, Muhamad.
Título: Relative efficacy of organic substrates on maize root proliferation under water stress / Eficácia relativa de substratos orgânicos na proliferação de raízes de milho sob estresse hídrico
Fonte: Biosci. j. (Online);35(1):101-113, jan./fev. 2019. tab, graf, ilus.
Idioma: en.
Resumo: The aggravating threat for today's agriculture is provision of food security to ever-escalating population utilizing scarce resources. Water scarcity is restraining humans to produce more from drops of water in place of gallons. Root is present at soil-plant interface and is main water extractor for plant. Its growth pattern varies as soil moisture conditions fluctuates. Present pot study consisting of two factors i.e. organic substrates (Farm manure, Poultry Manure and Molasses) and different water stress levels {50, 75, 100 and 125% of available water contents (AWCs)} using maize as test crop to assess their impact on different growth parameters (especially root growth). The experiment was conducted using completely randomized design CRD under factorial arrangement. Root length (44.5 cm), root fresh & dry biomass (71.1 g and 24.3 g, respectively), root diameter (1.73 mm), root volume (0.24 cm3) and root length density (7.4 x 10-3 cm cm-3) were observed in farm manure treated pots at 75% AWC that was statistically indistinguishable from all other treatments at same water level and 100% water availability but eloquently greater than plants of all treatments at 50% and 125% available water contents. Shoot length, dry and fresh weights were observed greater in plants having 100% available moistures. They were statistically at par with 75% water treated plants. Comparing treatments for all the parameters in multivariate cluster analysis it was concluded that 75% available water contents produce almost similar to 100% along with the benefit of water security.

A ameaça agravante para a agricultura atual é a provisão de segurança alimentar para populações cada vez maiores, utilizando recursos escassos. A escassez de água está restringindo os seres humanos a produzir mais a partir de gotas de água no lugar de galões. A raiz está presente na interface solo-planta e é o principal extrator de água para a planta. Seu padrão de crescimento varia conforme as condições de umidade do solo flutuam. O presente estudo em vaso é constituído por dois fatores, ou seja, substratos orgânicos (esterco bovino, esterco de aves e melaço) e diferentes níveis de stress hídrico {50, 75, 100 e 125% do teor de água disponível (AWCs)} utilizando milho como cultura de teste para avaliar o seu impacto em diferentes parâmetros de crescimento (especialmente crescimento de raiz). O experimento foi conduzido utilizando delineamento experimental inteiramente casualizado, em arranjo fatorial. Raiz radicular (44,5 cm), biomassa seca e fresca da raiz (71,1 ge 24,3 g, respectivamente), diâmetro radicular (1,73 mm), volume radicular (0,24 cm3) e densidade radicular (7,4 x 10-3 cm cm-3) foram observados em vasos tratados com esterco de fazenda a 75% AWC que foi estatisticamente indistinguível de todos os outros tratamentos no mesmo nível de água e 100% de disponibilidade de água, mas eloqüentemente maior que plantas de todos os tratamentos a 50% e 125% de conteúdo de água disponível. O comprimento do rebento, peso seco e fresco foram maiores nas plantas com 100% de umidade disponível. Eles foram estatisticamente equivalentes a 75% de plantas tratadas com água. Comparando os tratamentos para todos os parâmetros na análise multivariada de clusters, concluiu-se que 75% do conteúdo de água disponível produz quase o mesmo que 100%, juntamente com o benefício da segurança hídrica.
Descritores: Raízes de Plantas
Zea mays
Desidratação
Secas
-Solo
Escassez de Água
Abastecimento de Alimentos
Responsável: BR396.1 - Biblioteca Central



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