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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


  3 / 31 LILACS  
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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


  5 / 31 LILACS  
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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


  6 / 31 LILACS  
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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


  7 / 31 LILACS  
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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


  8 / 31 LILACS  
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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


  9 / 31 LILACS  
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Id: biblio-1049110
Autor: Oliveira, Fernando Sarmento de; Sarmento, Erivanessa Costa Sousa; Dombroski, Jeferson Luiz Dallabona; Silva, Daniel Valadão; Freitas, Claudia Daianny Melo; Souza, Matheus Freitas; Borges, Maiara Pinheiro da Silva; Silveira, Lindomar Maria da.
Título: Accumulation of macronutrients in cowpea and weeds in competition and under soil water deficit / Acumulação de macronutrientes em feijão-caupi e plantas daninhas em competição e sob déficit hídrico no solo
Fonte: Biosci. j. (Online);35(6):1747-1757, nov./dec. 2019. tab.
Idioma: en.
Resumo: The ability of a plant species to succeed in colonization of agroecosystem depends on its efficiency in the use of growth resources even in deficient conditions. The present study aimed to evaluate the effects of competition and water deficit in the soil on the accumulation of macronutrients of Vigna unguiculataL. Walp., Commelina benghalensis L. and Waltheria indica L. The study was conducted in a greenhouse, in randomized block design, with four replications. The treatments were arranged in a 5 × 2 factorial, with the first factor corresponding to types of interaction among species (V. unguiculata + C. benghalensis; V. unguiculata + W. indica; V. unguiculata in monoculture, C. benghalensis in monoculture and W. indica in monoculture), and the second of water regimes (irrigated and water deficit).The water deficit differently affects macronutrient content on the species, with decreased of K, Ca and Mg in cowpea, and N, P, K and Ca in W. indica. For C. benghalensis, the water deficit does not reduce the macronutrient contents on the plant. The competition between plants intensifies the effects of water deficit only on C. benghalensis, with a decreased on the content of all macronutrients studied. Under irrigated conditions, competition between plants was more damaging the weeds compared to cowpea. The C. benghalensis specie, free from interference, has a high potential for nutrient extraction under irrigated and water deficit regimes.

A capacidade de uma espécie vegetal para ter sucesso na colonização do agroecossistema depende da sua eficiência na utilização dos recursos de crescimento mesmo em condições deficientes. Objetivou-se avaliar os efeitos da competição e déficit hídrico no solo no conteúdo de macronutrientes de feijão-caupi (Vigna unguiculata L. Walp.), trapoeraba (Commelina benghalensis L.) e malva-branca (Waltheria indica L.). Foi conduzido estudo em casa de vegetação, em delineamento em blocos casualizado, com quatro repetições. Os tratamentos foram arranjados em fatorial 5 × 2, com o primeiro fator correspondente aos arranjos de competição entre as espécies (V. unguiculata + C. benghalensis; V. unguiculata + W. indica; V. unguiculataem monocultivo; C. benghalensis em monocultivo e W. indica em monocultivo), e o segundo dos regimes hídricos (irrigado e déficit hídrico). O déficit hídrico afeta de forma diferenciada o conteúdo de macronutrientes nas espécies, com redução de K, Ca e Mg no feijão-caupi, e N, P, K e Ca em W. indica. Para C. benghalensis, o déficit hídrico não reduz os conteúdos de macronutrientes na planta. A competição entre plantas intensifica os efeitos do déficit hídrico apenas em C. benghalensis, com redução do conteúdo de todos os macronutrientes estudados. Em condições irrigadas, a competição entre plantas foi mais prejudicial as plantas daninhas do que o feijão-caupi. Aespécie C. benghalensis, livre de interferência, apresenta elevado potencial de extração de nutrientes sob regimes irrigado e de déficit hídrico.
Descritores: Solo
Alimentos
Malvaceae
Commelina
Desidratação
Vigna
-Plantas Daninhas
Responsável: BR396.1 - Biblioteca Central


  10 / 31 LILACS  
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Id: biblio-1049091
Autor: Ribeiro, Larissa Pereira; Evangelista, Jeniffer Santana Pinto Coelho; Damacena, Michelle Brandão; Elizeu, Arthur Mayrink; Coelho, Igor Ferreira; Rodrigues, Erina Vitório; Teodoro, Paulo Eduardo; Bhering, Leonardo Lopes.
Título: Estimates of genetic divergence in cowpea by multivariate analysis in different environments / Estimativa de divergência genética em feijão-caupi por meio de análise multivariada em diferentes ambientes
Fonte: Biosci. j. (Online);35(6):1681-1687, nov./dec. 2019. tab, ilus.
Idioma: en.
Resumo: Cowpea is a legume of great importance in the Brazilian nutrition, mainly in the Northeast region. Despite the low yield of Brazilian cowpea, the species presents a genetic potential to be explored. Thus, this work aimed to characterize the genetic diversity of cowpea genotypes by agronomic traits and select genotypes for possible crosses by multivariate analysis. Four value for cultivation and use tests were carried out with cowpea genotypes in 2005 and 2006, in the municipalities of Aquidauana, Chapadão do Sul, and Dourados, in the state of Mato Grosso do Sul. The experimental design was a complete randomized block with 20 genotypes and four replications. The evaluated traits were value for cultivation, plant lodging, pod length, grain weight of five pods, number of grains per pod, pod weight, severity of powdery mildew, and grain yield. To estimate the genetic diversity among the genotypes, the optimization methods of Tocher and UPGMA were used. The generalized distance of Mahalanobis was used as a dissimilarity measure. The clustering methods revealed genetic variability among the cowpea genotypes evaluated. The methods used formed a different number of groups for each environment. Genotypes TE97-309G-24, MNC99-542F-5, BRS Paraguaçu, BRS Paraguaçu, BR 17-Gurguéia, and CNC x 409-11F-P2 can be used to obtain promising combinations and high genetic variability.

O feijão-caupi é de grande importância na nutrição brasileira, principalmente na região Nordeste. Apesar do baixo rendimento do feijão-caupi no Brasil, esta leguminosa apresenta potencial genético a ser explorado. Dessa forma, o objetivo do trabalho foi caracterizar a variabilidade genética de caracteres agronômicos e estimar a divergência genética entre genótipos de feijão-caupi por meio de análise multivariada. Quatro ensaios de valor de cultivo e uso com genótipos de feijão-caupi foram conduzidos nos anos de 2005 e 2006, nos municípios de Aquidauana, Chapadão do Sul e Dourados. Os experimentos foram conduzidos em delineamento blocos casualizados, com 20 genótipos e quatro repetições. Os caracteres avaliados foram acamamento de plantas, comprimento de vagem, peso de grãos de cinco vagens, número de grãos por vagem, peso de vagem e produtividade de grãos. Realizou-se análise de variância individual e conjunta. Para estimar a diversidade genética entre os genótipos, foram utilizados o métodos de otimização de Tocher e UPGMA. A distância generalizada de Mahalanobis foi utilizada como medida de dissimilaridade. Foi possível detectar variabilidade genética entre os genótipos de feijão-caupi avaliados por meio dos métodos de agrupamento utilizados. Os métodos utilizados formaram números de grupos distintos para cada ambiente. Os genótipos TE97-309G-24, MNC99-542F-5, BRS Paraguaçu, BRS Paraguaçu, BR 17-Gurguéia e CNC x 409-11F-P2 podem ser usados para obter combinações promissoras e elevada variabilidade genética.
Descritores: Variação Genética
Análise Multivariada
Vigna
Responsável: BR396.1 - Biblioteca Central



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