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Id: biblio-1224606
Autor: Ji, Jing; Shi, Shengqing; Chen, Wei; Xie, Tiantian; Du, Changjian; Sun, Jiacheng; Shi, Zheng; Gao, Rongfu; Jiang, Zeping; Xiao, Wenfa.
Título: Effects of exogenous γ-Aminobutyric acid on the regulation of respiration and protein expression in germinating seeds of mungbean (Vigna radiata) under salt conditions
Fonte: Electron. j. biotechnol;47:1-9, sept. 2020. graf, tab.
Idioma: en.
Projeto: National Natural Science Foundation of China; . National Key Research and Development Program of the Ministry of Science and Technology of China; . Research Funds of Key Laboratory of Tree Breeding and Cultivation of State Forestry Administration; . Fundamental Research Funds for the Central Non-Profit Research Institution of CAF.
Resumo: BACKGROUND: γ-Aminobutyric acid (GABA) bypasses the TCA cycle via GABA shunt, suggesting a relationship with respiration. However, little is known about its role in seed germination under salt conditions. RESULTS: In this study, exogenous GABA was shown to have almost no influence on mungbean seed germination, except 0.1 mM at 10 h, while it completely alleviated the inhibition of germination by salt treatment. Seed respiration was significantly inhibited by 0.1 and 0.5 mM GABA, but was evidently enhanced under salt treatment, whereas both were promoted by 1 mM GABA alone or with salt treatment. Mitochondrial respiration also showed a similar trend at 0.1 mM GABA. Moreover, proteomic analysis further showed that 43 annotated proteins were affected by exogenous GABA, even 0.1 mM under salt treatment, including complexes of the mitochondrial respiratory chain. CONCLUSIONS: Our study provides new evidence that GABA may act as a signal molecule in regulating respiration of mungbean seed germination in response to salt stress.
Descritores: Sementes/crescimento & desenvolvimento
Vigna
Ácido gama-Aminobutírico
-Respiração
Estresse Fisiológico
Proteínas
Germinação
Proteômica
Tolerância ao Sal
Estresse Salino
Responsável: CL1.1 - Biblioteca Central


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Id: biblio-1146989
Autor: Machado, Thiago Pulici Martins; Medeiros, André Dantas de; Pinheiro, Daniel Teixeira; Silva, Laércio Junio da; Dias, Denise Cunha Fernandes dos Santos.
Título: Non-destructive identification of physical damage in mung bean (Vigna radiata L. ) seeds by X-ray image analysis / Identificação não destrutiva de danos físicos em sementes de feijão-mungo (Vigna radiata L. ) por análise de imagem de raios-X
Fonte: Biosci. j. (Online);36(3):932-941, 01-05-2020. ilus, tab.
Idioma: en.
Resumo: Global demand for pulses such as the mung bean has grown in the last years. For successful production of these crops it is necessary to use high quality seeds. Methodologies based on X-ray image analysis have been used as a complementary tool to evaluate the physical quality of seeds due to their speed and potential for automation. The aim of this study was to evaluate the efficiency of X-ray analysis for non-destructive evaluation of the physical quality of Vigna radiata seeds and to relate the variables obtained with their physiological potential. For this, seeds from eight lots were X-rayed and subsequently subject to germination test. In total, 18 physical and physiological parameters were determined. The X-ray image analysis was efficient for evaluating the internal morphology of Vigna radiata seeds and allowed the identification of various damage types. However, it was not possible to relate the physical variables to the seed quality as the lots presented similar germination percentage. Physical variables such as solidity and circularity are related to percentage of root protrusion and length of seedling hypocotyl. Low relative densities indicate deteriorated tissues, related to severe morphological damage and non-viable seeds.

A demanda mundial por leguminosas como o feijão mungo tem crescido nos últimos anos. Para o sucesso da produção destas culturas é necessário a utilização de sementes de alta qualidade. Metodologias baseadas na análise de imagens de raios X têm sido utilizadas como ferramenta complementar para avaliação da qualidade física de sementes em função da sua rapidez e potencial de automatização. O objetivo deste trabalho foi avaliar a eficiência da análise de raios X para avaliação não destrutiva da qualidade física de sementes de Vigna radiata, e relacionar as variáveis obtidas com o seu potencial fisiológico.Para tal, sementes de oito lotes foram radiografadas e submetidas ao teste de germinação. Por meio dessas avaliações foram determinadas 18 variáveis, distribuídas entre físicas e fisiológicas. A análise de imagens de raios X foi eficiente para a avaliação da morfologia interna das sementes Vigna radiata e permitiu a identificação de vários tipos de danos. Porém, não foi possível relacionar as variáveis físicas com a qualidade das sementes, pois os lotes apresentaram porcentagens de germinação semelhantes. Variáveis físicas como solidez e circularidade estão relacionadas com a percentagem de protrusão radicular e o comprimento de hipocótilo das plântulas. Densidades relativas baixas indicam tecidos deteriorados, tendo relação com danos morfológicos graves e sementes inviáveis.
Descritores: Sementes
Raios X
Vigna
Responsável: BR396.1 - Biblioteca Central


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Id: biblio-1146982
Autor: Souza, Fernando Ramos de; Barbosa, Ernandes Silva; Martins, Lucas César; Borella, Junior; Machado, Aroldo Ferreira Lopes.
Título: Herbicide weed control ­ induced differential tolerance and productivity in cowpea plants / Controle de ervas daninhas com herbicida - tolerância diferencial induzida e produtividade em plantas de feijão-caupi
Fonte: Biosci. j. (Online);36(3):865-875, 01-05-2020. tab, graf.
Idioma: en.
Resumo: The use of herbicides is a represents an efficient way to control the infesting plant population, since it is associated with low operational cost, and it does not demand large amounts of labour. An obstacle to growing cowpea (Vigna unguiculate) is the absence of herbicides registered for this crop. The objective of this work was to evaluate the tolerance of cowpea to herbicides. The experiment was carried out in a randomised block with treatment controls with and without weeding, Bentazon (720 g ha-1), Fluazifop-p-butyl (250 g ha-1), Fomesafen and a tank mix between Fluazifop-p-butyl + Fomesafen (250 + 187.5 g ha-1) with treatment replicates. The herbicides were applied on vegetative (V3 ­ stage) cowpea plants using a CO2-pressurised backpack sprayer with four spray tips TT 110.02 operating at a pressure of 2.5 bar and applying 240 litres of syrup per hectare. The cultivar BRS Guariba, with five planting lines per plot, was tested with the three central lines of the useful area, scoring 0.5 m of the ends. The species Oxalis latifolia was difficult to control. The Fluazifop-p-butyl + Fomesafen mixture presented better control of weeds. The herbicides caused phytotoxicity to cowpea and reduced leaf area and dry mass. The productivity of the crop was affected due to the low control of weeds. It was concluded that the cowpea presented differential tolerance to the herbicides tested doses.

O uso de herbicidas é uma alternativa promissora, pois permite um controle eficiente da população de plantas infestantes, associado a baixo custo operacional e sem exigir grandes quantidades de mão de obra. No entanto, um entrave no controle de plantas daninhas no feijão-caupi é a ausência de herbicidas registrados para essa cultura. Objetivou-se com este trabalho avaliar a tolerância do feijão-caupi cultivar BRS Guariba, a herbicidas. Um ensaio foi conduzido a campo em blocos casualizados composto dos tratamentos, testemunhas com e sem capina, Bentazon (720 g i.a. ha-1), Fluazifop-p-butyl (250 g i.a. ha-1), Fomesafen (187,5 g i.a. ha-1) e mistura de tanque entre Fluazifop-p-butyl + Fomesafen (250 + 187,5 g i.a. ha-1) com 4 repetições. Os herbicidas foram aplicados com plantas de caupi em estágio vegetativo V3 com pulverizador costal pressurizado por CO2 com quatro pontas de pulverização TT 110.02 operando a uma pressão de 2,5 Bar e aplicando 240 L ha-1 de calda. As parcelas foram compostas 5 linhas de plantio com cinco metros de comprimento, espaçadas de 0,5 m, com as 3 linhas centrais de área útil, desprezando 0,5 m das extremidades. Avaliou-se a comunidade infestante, a eficiência de controle de plantas daninhas, a tolerância e a produtividade do feijão-caupi. A espécie Oxalis latifolia foi encontrada em todos os tratamentos e apresentou difícil controle. A mistura Fluazifop-p-butyl + Fomesafen apresentou melhor controle das plantas daninhas. Os herbicidas ocasionaram fitotoxicidade ao feijão-caupi e redução de área foliar e massa seca de plantas. A produtividade da cultura foi reduzida nos tratamentos com baixo controle de plantas daninhas bem como nos tratamentos que provocaram toxicidade elevada. Conclui-se que o feijão-caupi apresentoutolerância diferencial aos herbicidas nas doses testadas.
Descritores: Plantas Daninhas
Vigna
Herbicidas
Responsável: BR396.1 - Biblioteca Central


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Id: biblio-1118055
Autor: Tavares, Cássio Jardim; Sousa, Morgana Soares; Freitas, Marco Antonio Moreira de; Sales, Juliana de Fátima; Resende, Osvaldo; Jakelaitis, Adriano.
Título: Quality of adzuki bean seeds desiccated with flumioxazin and subjected to storage / Qualidade de sementes de feijão azuki dessecadas com flumioxazin e submetidas ao armazenamento
Fonte: Arq. Inst. Biol;87:e0862018, 2020. tab, graf.
Idioma: en.
Projeto: Coordenação de Aperfeiçoamento de Pessoal de Nível Superior.
Resumo: Production and storage environments influence the physiological and sanitary quality of seeds. This study aimed to evaluate the effects of the herbicide flumioxazin applied as a preharvest desiccant and storage on the physiological and sanitary quality of adzuki bean seeds. A randomized block design was used in a split-plot scheme, with four replications. Plots consisted of five doses of the herbicide flumioxazin (20, 25, 30, 35, and 40 g ai·ha-1) and subplots consisted of two evaluation times (harvest and six months after harvest). Two controls, with no herbicide application, were tested for each evaluation time. The physiological seed quality was maintained with doses from 25 to 35 g·ha-1 of flumioxazin. Increasing herbicide doses reduced the electrical conductivity of seeds. The increased doses also reduced the percentage of normal seedlings in the first germination count after six months of storage and caused seedling vigor loss. The storage of adzuki bean for six months reduced its physiological quality, leading to losses in germination and seed vigor. Storage and increasing doses of the desiccant flumioxazin reduced the incidence of the pathogens Rhizopus, Cladosporium, and Fusarium in the seeds. The increased doses of this herbicide reduced Aspergillus incidence. Penicillium incidence was not affected by treatments.(AU)

A qualidade fisiológica e sanitária de sementes é influenciada pelo ambiente de produção e de armazenamento. Neste trabalho objetivou-se avaliar os efeitos do herbicida flumioxazin aplicado como dessecante em pré-colheita e do armazenamento sobre a qualidade fisiológica e sanitária de sementes de feijão azuki. Foi adotado o delineamento experimental em blocos ao acaso, em esquema de parcelas subdivididas. Nas parcelas foram alocadas as cinco doses do herbicida flumioxazin (20, 25, 30, 35 e 40 g i.a·ha-1) e nas subparcelas as duas épocas de avaliação (colheita e 6 meses após a colheita), com quatro repetições. Foram testados dois tratamentos sem aplicação do herbicida para cada época de avaliação. Nas doses entre 25 a 35 g·ha-1 de flumioxazin observou-se a manutenção da qualidade fisiológica das sementes. Em doses crescentes reduziu-se a condutividade elétrica das sementes. O aumento das doses reduziu a porcentagem de plântulas normais na primeira contagem da germinação, após seis meses de armazenamento, e causou perda no vigor das plântulas. O armazenamento de feijão azuki durante seis meses reduziu a qualidade fisiológica, causando perdas na germinação e vigor das sementes. O armazenamento e o aumento das doses do dessecante flumioxazin reduziram a incidência dos patógenos Rhizopus, Cladosporium e Fusarium nas sementes. O aumento das doses reduziu a incidência de Aspergillus. A incidência de Penicillium não foi afetada pelos tratamentos.(AU)
Descritores: Sementes/fisiologia
Vigna
Herbicidas/efeitos adversos
-Higroscópicos
Noxas
Responsável: BR1942.1 - NID - Biblioteca - Núcleo de Informação e Documentação


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Id: biblio-1118056
Autor: Ferreira, Antonia Débora Camila de Lima; Silva, Leandro Carvalho da; Nere, Daniel Rodrigues; Bleicher, Ervino.
Título: Population parameters as a way to evaluate the risk of attack of Aphis craccivora (Hemiptera: Aphididae) on cowpea / Parâmetros populacionais como forma de avaliar os riscos de ataque de Aphis craccivora (Hemiptera: Aphididae) em feijão-caupi
Fonte: Arq. Inst. Biol;87:e1102018, 2020. tab.
Idioma: en.
Projeto: Coordenação de Aperfeiçoamento de Pessoal de Nível Superior.
Resumo: The objective of this research was to develop fertility life tables in order to estimate the population parameters of black aphid (Aphis craccivora Koch) in cowpea (Vigna unguiculata) varieties, aiming to propose a risk scale for its use. The experiment consisted of six treatments and six replicates (five varieties plus the cultivar VITA 7 as a susceptible control). A cohort was formed with six adult females distributed in six replicates of each genotype, and the insects were observed daily. Based on the data, fertility life tables were drawn for each variety and the population parameters were estimated. The different values of the finite growth rate (λ) were considered to propose a risk scale for the use of the genotypes. The results obtained give the dimension of the variability of V. unguiculata in respect to the character, resistance to A. craccivora, with antibiosis as the main mechanism of resistance. Considering all the results, the varieties studied can be classified according to their suitability as a plant favorable to the development of the black aphid as follows: VITA 7 > CE-13 > CE-51 > CE-08 = CE-07. The proposal of a risk scale for the use of V. unguiculata genotypes against the A. craccivora population, based on the finite growth rate (λ) values, was adequate to discriminate the varieties studied.(AU)

Objetivou-se nesta pesquisa elaborar tabelas de vida de fertilidade com o intuito de estimar os parâmetros populacionais de pulgão-preto (Aphis craccivora Koch) em variedades de feijão-caupi (Vigna unguiculata), visando propor uma escala de risco para o seu uso. O experimento constituiu-se em seis tratamentos (cinco variedades mais o cultivar VITA 7 como padrão de suscetibilidade) com seis repetições. Formou-se uma coorte com seis fêmeas adultas distribuídas em cada genótipo, sendo todos os indivíduos observados diariamente. De posse dos dados, foram elaboradas tabelas de vida de fertilidade para cada variedade e estimados os parâmetros populacionais. Para propor uma escala de risco de uso de genótipos, ponderou-se sob os diferentes valores da razão finita de crescimento (λ). Os resultados obtidos dão a dimensão da variabilidade de V. unguiculata com relação ao caráter da resistência a A. craccivora, sendo a antibiose o principal mecanismo de resistência associado. Considerando-se todos os resultados, foi possível hierarquizar as variedades estudadas segundo sua aptidão como planta favorável ao desenvolvimento ao pulgão-preto conforme segue: VITA 7 >> CE-13 > CE-51 > CE-08 = CE-07. A proposta de uma escala de risco do uso de genótipos de V. unguiculata frente à população de A. craccivora, baseada nos valores da razão finita de crescimento (λ), foi adequada para discriminar as variedades estudadas.(AU)
Descritores: Afídeos
Vigna
Fabaceae
-Controle de Pragas
Genótipo
Antibiose
Responsável: BR1942.1 - NID - Biblioteca - Núcleo de Informação e Documentação


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Id: biblio-886887
Autor: FERNANDES, FRANCISCO S; GODOY, WESLEY A C; RAMALHO, FRANCISCO S; GARCIA, ADRIANO G; SANTOS, BÁRBARA D B; MALAQUIAS, JOSÉ B.
Título: Population dynamics of Aphis gossypii Glover and in sole and intercropping systems of cotton and cowpea
Fonte: An. acad. bras. ciênc;90(1):311-323, Mar. 2018. tab, graf.
Idioma: en.
Resumo: ABSTRACT Population dynamics of aphids have been studied in sole and intercropping systems. These studies have required the use of more precise analytical tools in order to better understand patterns in quantitative data. Mathematical models are among the most important tools to explain the dynamics of insect populations. This study investigated the population dynamics of aphids Aphis gossypii and Aphis craccivora over time, using mathematical models composed of a set of differential equations as a helpful analytical tool to understand the population dynamics of aphids in arrangements of cotton and cowpea. The treatments were sole cotton, sole cowpea, and three arrangements of cotton intercropped with cowpea (t1, t2 and t3). The plants were infested with two aphid species and were evaluated at 7, 14, 28, 35, 42, and 49 days after the infestations. Mathematical models were used to fit the population dynamics of two aphid species. There were good fits for aphid dynamics by mathematical model over time. The highest population peak of both species A. gossypii and A. craccivora was found in the sole crops, and the lowest population peak was found in crop system t2. These results are important for integrated management programs of aphids in cotton and cowpea.
Descritores: Afídeos/fisiologia
Produtos Agrícolas/parasitologia
Gossypium/parasitologia
Vigna/parasitologia
-Valores de Referência
Especificidade da Espécie
Fatores de Tempo
Asas de Animais/fisiologia
Dinâmica Populacional
Densidade Demográfica
Modelos Teóricos
Limites: Animais
Responsável: BR1.1 - BIREME


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Id: biblio-886906
Autor: SILVA, GLÁUCIA ALVES E; SIQUEIRA, JOSÉ O; STÜRMER, SIDNEY L; MOREIRA, FATIMA M S.
Título: Effectiveness of Arbuscular Mycorrhizal Fungal Isolates from the Land Uses of Amazon Region in Symbiosis with Cowpea
Fonte: An. acad. bras. ciênc;90(1):357-371, Mar. 2018. tab, graf.
Idioma: en.
Resumo: ABSTRACT Arbuscular mycorrhizal fungi provide several ecosystem services, including increase in plant growth and nutrition. The occurrence, richness, and structure of arbuscular mycorrhizal fungi communities are influenced by human activities, which may affect the functional benefits of these components of the soil biota. In this study, 13 arbuscular mycorrhizal fungi isolates originating from soils with different land uses in the Alto Solimões-Amazon region were evaluated regarding their effect on growth, nutrition, and cowpea yield in controlled conditions using two soils. Comparisons with reference isolates and a mixture of isolates were also performed. Fungal isolates exhibited a wide variability associated with colonization, sporulation, production of aboveground biomass, nitrogen and phosphorus uptake, and grain yield, indicating high functional diversity within and among fungal species. A generalized effect of isolates in promoting phosphorus uptake, increase in biomass, and cowpea yield was observed in both soils. The isolates of Glomus were the most efficient and are promising isolates for practical inoculation programs. No relationship was found between the origin of fungal isolate (i.e. land use) and their symbiotic performance in cowpea.
Descritores: Solo/química
Microbiologia do Solo
Simbiose/fisiologia
Micorrizas/isolamento & purificação
Micorrizas/fisiologia
Vigna/crescimento & desenvolvimento
-Fósforo/análise
Fatores de Tempo
Brasil
Raízes de Plantas/microbiologia
Biodiversidade
Vigna/microbiologia
Nitrogênio/análise
Responsável: BR1.1 - BIREME


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Id: biblio-886881
Autor: FERNANDES, FRANCISCO S; GODOY, WESLEY A C; RAMALHO, FRANCISCO S; MALAQUIAS, JOSÉ B; SANTOS, BÁRBARA D B.
Título: The behavior of Aphis gossypii and Aphis craccivora (Hemiptera: Aphididae) and of their predator Cycloneda sanguinea (Coleoptera: Coccinellidae) in cotton-cowpea intercropping systems
Fonte: An. acad. bras. ciênc;90(1):373-383, Mar. 2018. tab, graf.
Idioma: en.
Resumo: ABSTRACT The intercropping is an important cultural practice commonly used in pest management. It is based on the principle that increased plant diversity in the agro-ecosystem can lead to reductions of pest populations in the crop. The current study aimed to assess the impact the colored fiber cotton-cowpea intercropped systems on Aphis gossypii and Aphis craccivora and on their predator Cycloneda sanguinea and the losses and the dispersion behavior of these aphids and their predator in these cropping systems. The experiment had a randomized block experimental design with two bioassays and four treatments. The number of apterous and alate aphids (A. gossypii) per cotton plant was 1.46 and 1.73 or 1.97 and 2.19 times highest in the solid cotton system than that found in the cotton-cowpea intercropped systems (S1) and (S2), respectively. On the other hand, the cotton-cowpea intercropped systems (S1 and S2) reduced, respectively, in 43% and 31% the number of apterousA. gossypiiper cotton plant compared to the control. Implementing cotton-cowpea intercropped system in the S1 scheme reduced A. gossypii infestation, favored the multiplication of C. sanguinea, and allowed obtaining heavier open bolls.
Descritores: Afídeos/fisiologia
Comportamento Predatório/fisiologia
Besouros/fisiologia
Produtos Agrícolas/parasitologia
Gossypium/parasitologia
Vigna/parasitologia
-Bioensaio
Controle Biológico de Vetores
Análise de Variância
Estatísticas não Paramétricas
Distribuição Animal
Limites: Animais
Responsável: BR1.1 - BIREME


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Id: biblio-951812
Autor: Santos, Alexandra de Andrade; Silveira, Joaquim Albenísio Gomes da; Bonifacio, Aurenivia; Rodrigues, Artenisa Cerqueira; Figueiredo, Márcia do Vale Barreto.
Título: Antioxidant response of cowpea co-inoculated with plant growth-promoting bacteria under salt stress
Fonte: Braz. j. microbiol;49(3):513-521, July-Sept. 2018. tab, graf.
Idioma: en.
Resumo: Abstract Soil salinity is an important abiotic stress worldwide, and salt-induced oxidative stress can have detrimental effects on the biological nitrogen fixation. We hypothesized that co-inoculation of cowpea plants with Bradyrhizobium and plant growth-promoting bacteria would minimize the deleterious effects of salt stress via the induction of enzymatic and non-enzymatic antioxidative protection. To test our hypothesis, cowpea seeds were inoculated with Bradyrhizobium or co-inoculated with Bradyrhizobium and plant growth-promoting bacteria and then submitted to salt stress. Afterward, the cowpea nodules were collected, and the levels of hydrogen peroxide; lipid peroxidation; total, reduced and oxidized forms of ascorbate and glutathione; and superoxide dismutase, catalase and phenol peroxidase activities were evaluated. The sodium and potassium ion concentrations were measured in shoot samples. Cowpea plants did not present significant differences in sodium and potassium levels when grown under non-saline conditions, but sodium content was strongly increased under salt stress conditions. Under non-saline and salt stress conditions, plants co-inoculated with Bradyrhizobium and Actinomadura or co-inoculated with Bradyrhizobium and Paenibacillus graminis showed lower hydrogen peroxide content in their nodules, whereas lipid peroxidation was increased by 31% in plants that were subjected to salt stress. Furthermore, cowpea nodules co-inoculated with Bradyrhizobium and plant growth-promoting bacteria and exposed to salt stress displayed significant alterations in the total, reduced and oxidized forms of ascorbate and glutathione. Inoculation with Bradyrhizobium and plant growth-promoting bacteria induced increased superoxide dismutase, catalase and phenol peroxidase activities in the nodules of cowpea plants exposed to salt stress. The catalase activity in plants co-inoculated with Bradyrhizobium and Streptomyces was 55% greater than in plants inoculated with Bradyrhizobium alone, and this value was remarkably greater than that in the other treatments. These results reinforce the beneficial effects of plant growth-promoting bacteria on the antioxidant system that detoxifies reactive oxygen species. We concluded that the combination of Bradyrhizobium and plant growth-promoting bacteria induces positive responses for coping with salt-induced oxidative stress in cowpea nodules, mainly in plants co-inoculated with Bradyrhizobium and P. graminis or co-inoculated with Bradyrhizobium and Bacillus.
Descritores: Cloreto de Sódio/metabolismo
Bradyrhizobium/fisiologia
Inoculantes Agrícolas/fisiologia
Vigna/microbiologia
Antioxidantes/metabolismo
-Proteínas de Plantas/metabolismo
Estresse Fisiológico
Superóxido Dismutase/metabolismo
Peroxidação de Lipídeos
Catalase/metabolismo
Peroxidase/metabolismo
Estresse Oxidativo
Salinidade
Vigna/crescimento & desenvolvimento
Vigna/metabolismo
Glutationa/metabolismo
Responsável: BR1.1 - BIREME


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Id: biblio-974305
Autor: Leite, Jakson; Passos, Samuel Ribeiro; Simões-Araújo, Jean Luiz; Rumjanek, Norma Gouvêa; Xavier, Gustavo Ribeiro; Zilli, Jerri Édson.
Título: Genomic identification and characterization of the elite strains Bradyrhizobium yuanmingense BR 3267 and Bradyrhizobium pachyrhizi BR 3262 recommended for cowpea inoculation in Brazil
Fonte: Braz. j. microbiol;49(4):703-713, Oct.-Dec. 2018. tab, graf.
Idioma: en.
Resumo: ABSTRACT The leguminous inoculation with nodule-inducing bacteria that perform biological nitrogen fixation is a good example of an "eco-friendly agricultural practice". Bradyrhizobium strains BR 3267 and BR 3262 are recommended for cowpea (Vigna unguiculata) inoculation in Brazil and showed remarkable responses; nevertheless neither strain was characterized at species level, which is our goal in the present work using a polyphasic approach. The strains presented the typical phenotype of Bradyrhizobium with a slow growth and a white colony on yeast extract-mannitol medium. Strain BR 3267 was more versatile in its use of carbon sources compared to BR 3262. The fatty acid composition of BR 3267 was similar to the type strain of Bradyrhizobium yuanmingense; while BR 3262 was similar to Bradyrhizobium elkanii and Bradyrhizobium pachyrhizi. Phylogenetic analyses based on 16S rRNA and three housekeeping genes placed both strains within the genus Bradyrhizobium: strain BR 3267 was closest to B. yuanmingense and BR 3262 to B. pachyrhizi. Genome average nucleotide identity and DNA-DNA reassociation confirmed the genomic identification of B. yuanmingense BR 3267 and B. pachyrhizi BR 3262. The nodC and nifH gene analyses showed that strains BR 3267 and BR 3262 hold divergent symbiotic genes. In summary, the results indicate that cowpea can establish effective symbiosis with divergent bradyrhizobia isolated from Brazilian soils.
Descritores: Bradyrhizobium/isolamento & purificação
Bradyrhizobium/genética
Inoculantes Agrícolas/isolamento & purificação
Inoculantes Agrícolas/genética
Vigna/microbiologia
-Filogenia
Simbiose
Brasil
DNA Bacteriano/genética
RNA Ribossômico 16S/genética
Genoma Bacteriano
Evolução Molecular
Bradyrhizobium/classificação
Bradyrhizobium/fisiologia
Genômica
Nódulos Radiculares de Plantas/microbiologia
Inoculantes Agrícolas/classificação
Inoculantes Agrícolas/fisiologia
Vigna/fisiologia
Responsável: BR1.1 - BIREME



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