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Xilanases de Penicillium chrysogenum: produção, purificação, caracterização e aplicação no pré-branqueamento de polpa celulósica de pseudocaule de bananeira frutífera; Xylanases from Penicillium chrysogenum: production, purification, characterization, and their application to pre-bleaching cellulosic pulp of banana tree

Medeiros, Lígia Aíra de
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 14/12/2007 PT
Relevância na Pesquisa
36.45%
O objetivo desse trabalho foi estudar o potencial de xilanases presentes no filtrado de cultura e de xilanases purificadas de Penicillium chrysogenum no processo de branqueamento de polpa celulósica de pseudocaule de bananeiras frutíferas. Inicialmente, estabeleceu-se o meio e o tempo de cultivo ótimos para a produção de xilanase pelas linhagens IFO-4626 e M-85 de Penicillium chrysogenum. Ambas as linhagens apresentam, além da alta atividade de xilanase, alta atividade de pectinases e baixa atividade de celulases, características que contribuem para seu emprego no processamento de polpa e(ou) fibras celulósicas. Para a linhagem IFO-4626, a melhor produção de xilanase foi obtida no meio Ferreira após 60h de cultivo, usando como indutor xilana de oat spelt. O desempenho da linhagem M-85 só se iguala ao da IFO-4626 no tempo 72h, no meio Haas. Como fontes de carbono, palha de cana-de-açúcar e fibra de coco podem substituir a xilana de oat spelt na produção de xilanase pela linhagem IFO-4626. Xilose pode induzir a síntese de xilanase quando nenhuma fonte de xilana é adicionada ao meio. A inibição da atividade de xilanase foi observada nos meios com xilana e glicose (1%) ou galactose (1%). Nos experimentos de purificação da xilanase foi usado o filtrado de cultura obtido após 72h de cultivo da linhagem IFO-4626 no meio Ferreira. Dois picos com atividade de xilanase foram obtidos após a eluição em uma coluna de troca aniônica DEAE-Sephacel. A xilanase I...

Applicability of the use of waste from different banana cultivars for the cultivation of the oyster mushroom

Carvalho, Cristiane Suely Melo de; Aguiar, Lorena Vieira Bentolila de; Sales-Campos, Ceci; Minhoni, Marli Teixeira de Almeida; Andrade, Meire Cristina Nogueira de
Fonte: Sociedade Brasileira de Microbiologia Publicador: Sociedade Brasileira de Microbiologia
Tipo: Artigo de Revista Científica Formato: 819-826
ENG
Relevância na Pesquisa
26.38%
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES); The objective of this research was to evaluate the oyster mushroom Pleurotus ostreatus- (Jacq.: Fr.) Kumm. cultivation in substrates based on different combinations of wastes (leaf, pseudo-stem and pseudo-stem + leaf) and banana cultivars - Musa spp. (Thap Maeo, Prata Anã, Pelipita and Caipira) during 49 days. Organic matter loss in the substrate by action of the fungus was also evaluated during that period. It was verified that the pseudo-stem waste provided the best averages of biological efficiency among all cultivars tested and best rates were obtained by Thap Maeo (61.5%). The highest organic matter loss (OML) was obtained from pseudo-stem + leaf wastes (Prata Anã - 78.6%; Thap Maeo - 67.6%; Pelipita - 64.8%; Caipira - 60.6%). Therefore, the use of those wastes showed itself viable for P. ostreatus cultivation due to its availability and low cost, besides decreasing discards to environment.

Resíduos agroindustriais com potencial para a produção de holocelulases de origem fúngica e aplicações biotecnológicas de hidrolases

Siqueira, Félix Gonçalves de
Fonte: Universidade de Brasília Publicador: Universidade de Brasília
Tipo: Tese
POR
Relevância na Pesquisa
26.69%
Tese (doutorado)—Universidade de Brasília, Instituto de Ciências Biológicas, Departamento de Biologia Celular, 2010.; A complexidade e heterogeneidade das estruturas de holoceluloses de diferentes resíduos agrícolas requerem a ação sinérgica de enzimas para a sua completa hidrólise, envolvendo: celulase, hemicelulase e poligalacturonase. Os fungos filamentosos, Penicillium corylophilum, Aspergillus flavus, Aspergillus oryzae, Aspergillus terreus, Aspergillus awamori, Emericella nidulans, Acrophialophora nainiana, Pleurotus ostreatus, Agaricus brasiliensis e Trichoderma reesei, produzem holocelulases, quando cultivados em meios líquidos e sólidos tendo como fonte de carbono diferentes materiais lignocelulósicos, tais como engaço de bananeira, bagaço de cana-deaçúcar, resíduos do beneficiamento de algodão, resíduos da colheita de milho, entre outros. A purificação parcial em cromatografia de filtração em gel Sephacryl-200 do extrato bruto de P. corylophilum crescido piolho-de-algodão-sujo em meio líquido mostrou um pico de atividade de xilanase com 0,340 UI.mL-1. O extrato bruto de A. flavus crescido em engaço de bananeira apresentou atividades relevantes para xilanase, poligacturonase, porém teve atividade de endoglucase cinco vezes menor que o T. reesei RUT C-30. O fracionamento do extrato bruto do A. flavus (engaço de bananeira) foi realizado por membranas de ultrafiltração (PM: 300...

Study of tinctorial behaviour of curaua and banana fibres

Oliveira, Fernando R.; Souto, Késia K. O.; Silva, Tábhita L. T. da; Nascimento, José H. O. do; Aquino, Marcos S. de; Zille, Andrea
Fonte: Universidade do Minho Publicador: Universidade do Minho
Tipo: Conferência ou Objeto de Conferência
Publicado em //2015 ENG
Relevância na Pesquisa
36.32%
The ecological benefits of renewable raw materials are clear: they save valuable resources, are environmentally sound and do not cause health problems. Natural fibres have already established a track record in several different areas such as, civil, automobiles, architecture, medicine among others. Numerous investigations are carried out in order to create added value to natural fibre materials such as the stem of the banana tree that are usually discarded in the environment. Curaua, another important natural substrate, is an Amazon-forest plant (Ananas erectifolius) that resembles a pineapple plant. Curaua leaf fibres display a low-production cost and offer a relatively high tensile strength level. Despite these naturals fibres are well established as reinforce in composite materials, the dyeing properties of curaua and banana fibres are not well studied yet.; This work is supported by Portuguese National Funding, through FCT - Fundação para a Ciência e a Tecnologia, on the framework of project UID/CTM/00264/2013.

Production and characterization of an enzyme complex from a new strain of Clostridium thermocellum with emphasis on its xylanase activity

Vieira,Werner Bessa; Moreira,Leonora Rios de Souza; Monteiro Neto,Amadeu; Ferreira Filho,Edivaldo Ximenes
Fonte: Sociedade Brasileira de Microbiologia Publicador: Sociedade Brasileira de Microbiologia
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/06/2007 EN
Relevância na Pesquisa
46.45%
A new bacterial strain (ISO II) was isolated from manure cow and identified as phylogenetically close to the thermophilic cellulolytic bacterium Clostridium thermocellum. The new strain produced extracellular xylanase, pectinase, mannanase and cellulase activities when grown in liquid culture medium containing banana stem as carbon source. The enzyme production profile after growth on banana stem showed that xylanase and cellulase activities were detected in different incubation periods. An enzyme complex containing xylanase, cellulase and mannanase activities was isolated from culture supernatant samples of strainISO II. The complex was partially purified by ultrafiltration and gel filtration chromatography on Sephacryl S-300. Zymogram analysis after SDS-PAGE presented at least 05 subunits with xylanase activity. The enzyme showed single protein and xylanase activity bands after electrophoresis under non-denaturing conditions. The hydrolysis of xylan was optimal at temperature range of 55-75ºC and pH 6.0. Xylanase activity was quite stable at 65ºC, retaining 80% of its original activity after 12 h incubation. The apparent Km values, using insoluble and soluble arabinoxylans as substrates, were 1.54 and 11.53 mg/mL, respectively. Xylanase was activated by dithiothreitol...

Applicability of the use of waste from different banana cultivars for the cultivation of the oyster mushroom

Carvalho,Cristiane Suely Melo de; Aguiar,Lorena Vieira Bentolila de; Sales-Campos,Ceci; Minhoni,Marli Teixeira de Almeida; Andrade,Meire Cristina Nogueira de
Fonte: Sociedade Brasileira de Microbiologia Publicador: Sociedade Brasileira de Microbiologia
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/06/2012 EN
Relevância na Pesquisa
26.38%
The objective of this research was to evaluate the oyster mushroom Pleurotus ostreatus- (Jacq.: Fr.) Kumm. cultivation in substrates based on different combinations of wastes (leaf, pseudo-stem and pseudo-stem + leaf) and banana cultivars - Musa spp. (Thap Maeo, Prata Anã, Pelipita and Caipira) during 49 days. Organic matter loss in the substrate by action of the fungus was also evaluated during that period. It was verified that the pseudo-stem waste provided the best averages of biological efficiency among all cultivars tested and best rates were obtained by Thap Maeo (61.5%). The highest organic matter loss (OML) was obtained from pseudo-stem + leaf wastes (Prata Anã - 78.6%; Thap Maeo - 67.6%; Pelipita - 64.8%; Caipira - 60.6%). Therefore, the use of those wastes showed itself viable for P. ostreatus cultivation due to its availability and low cost, besides decreasing discards to environment.

Production of bioethanol using agricultural waste: banana pseudo stem

Ingale,Snehal; Joshi,Sanket J.; Gupte,Akshaya
Fonte: Sociedade Brasileira de Microbiologia Publicador: Sociedade Brasileira de Microbiologia
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/09/2014 EN
Relevância na Pesquisa
36.69%
India is amongst the largest banana (Musa acuminata) producing countries and thus banana pseudo stem is commonly available agricultural waste to be used as lignocellulosic substrate. Present study focuses on exploitation of banana pseudo stem as a source for bioethanol production from the sugars released due to different chemical and biological pretreatments. Two fungal strains Aspergillus ellipticus and Aspergillus fumigatus reported to be producing cellulolytic enzymes on sugarcane bagasse were used under co-culture fermentation on banana pseudo stem to degrade holocellulose and facilitate maximum release of reducing sugars. The hydrolysate obtained after alkali and microbial treatments was fermented by Saccharomyces cerevisiae NCIM 3570 to produce ethanol. Fermentation of cellulosic hydrolysate (4.1 g%) gave maximum ethanol (17.1 g/L) with yield (84%) and productivity (0.024 g%/h) after 72 h. Some critical aspects of fungal pretreatment for saccharification of cellulosic substrate using A. ellipticus and A. fumigatus for ethanol production by S. cerevisiae NCIM 3570 have been explored in this study. It was observed that pretreated banana pseudo stem can be economically utilized as a cheaper substrate for ethanol production.

Banana-Associated Microbial Communities in Uganda Are Highly Diverse but Dominated by Enterobacteriaceae

Rossmann, Bettina; Müller, Henry; Smalla, Kornelia; Mpiira, Samuel; Tumuhairwe, John Baptist; Staver, Charles; Berg, Gabriele
Fonte: American Society for Microbiology Publicador: American Society for Microbiology
Tipo: Artigo de Revista Científica
Publicado em /07/2012 EN
Relevância na Pesquisa
36.4%
Bananas are among the most widely consumed foods in the world. In Uganda, the country with the second largest banana production in the world, bananas are the most important staple food. The objective of this study was to analyze banana-associated microorganisms and to select efficient antagonists against fungal pathogens which are responsible for substantial yield losses. We studied the structure and function of microbial communities (endosphere, rhizosphere, and soil) obtained from three different traditional farms in Uganda by cultivation-independent (PCR-SSCP fingerprints of 16S rRNA/ITS genes, pyrosequencing of enterobacterial 16S rRNA gene fragments, quantitative PCR, fluorescence in situ hybridization coupled with confocal laser scanning microscopy, and PCR-based detection of broad-host-range plasmids and sulfonamide resistance genes) and cultivation-dependent methods. The results showed microhabitat-specific microbial communities that were significant across sites and treatments. Furthermore, all microhabitats contained a high number and broad spectrum of indigenous antagonists toward identified fungal pathogens. While bacterial antagonists were found to be enriched in banana plants, fungal antagonists were less abundant and mainly found in soil. The banana stem endosphere was the habitat with the highest bacterial counts (up to 109 gene copy numbers g−1). Here...

Applicability of the use of waste from different banana cultivars for the cultivation of the oyster mushroom

de Carvalho, Cristiane Suely Melo; de Aguiar, Lorena Vieira Bentolila; Sales-Campos, Ceci; de Almeida Minhoni, Marli Teixeira; de Andrade, Meire Cristina Nogueira
Fonte: Sociedade Brasileira de Microbiologia Publicador: Sociedade Brasileira de Microbiologia
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
26.38%
The objective of this research was to evaluate the oyster mushroom Pleurotus ostreatus- (Jacq.: Fr.) Kumm. cultivation in substrates based on different combinations of wastes (leaf, pseudo-stem and pseudo-stem + leaf) and banana cultivars - Musa spp. (Thap Maeo, Prata AnãPelipita and Caipira) during 49 days. Organic matter loss in the substrate by action of the fungus was also evaluated during that period. It was verified that the pseudo-stem waste provided the best averages of biological efficiency among all cultivars tested and best rates were obtained by Thap Maeo (61.5%). The highest organic matter loss (OML) was obtained from pseudo-stem + leaf wastes (Prata Anã 78.6%; Thap Maeo - 67.6%; Pelipita - 64.8%; Caipira - 60.6%). Therefore, the use of those wastes showed itself viable for P. ostreatus cultivation due to its availability and low cost, besides decreasing discards to environment.

Degradation and selective ligninolysis of wheat straw and banana stem for an efficient bioethanol production using fungal and chemical pretreatment

Thakur, Shilpi; Shrivastava, Bhuvnesh; Ingale, Snehal; Kuhad, Ramesh C.; Gupte, Akshaya
Fonte: Springer Berlin Heidelberg Publicador: Springer Berlin Heidelberg
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
46.26%
Lignocelluloses from agricultural, industrial, and forest residues constitute a majority of the total biomass present in the world. Environmental concerns of disposal, costly pretreatment options prior to disposal, and increased need to save valuable resources have led to the development of value-added alternate technologies such as bioethanol production from lignocellulosic wastes. In the present study, biologically pretreated (with the fungus, Pleurotus ostreatus HP-1) and chemically pretreated (with mild acid or dilute alkali) wheat straw (WS) and banana stem (BS) were subsequently subjected to enzymatic saccharification (with mixture of 6.0 U/g of filter paper cellulase and 17 U/g of β-glucosidase) and were evaluated for bioethanol production using Saccharomyces cerevisiae NCIM 3570. Biological and chemical pretreatments removed up to 4.0–49.2 % lignin from the WS and BS which was comparatively higher than that for cellulose (0.3–12.4 %) and for hemicellulose (0.7–21.8 %) removal with an average 5.6–49.5 % dry matter loss. Enzymatic hydrolysis yielded 64–306.6 mg/g (1.5–15 g/L) reducing sugars from which 0.15–0.54 g/g ethanol was produced from Saccharomyces cerevisiae NCIM 3570.

Production of bioethanol using agricultural waste: Banana pseudo stem

Ingale, Snehal; Joshi, Sanket J.; Gupte, Akshaya
Fonte: Sociedade Brasileira de Microbiologia Publicador: Sociedade Brasileira de Microbiologia
Tipo: Artigo de Revista Científica
Publicado em 09/10/2014 EN
Relevância na Pesquisa
26.67%
India is amongst the largest banana (Musa acuminata) producing countries and thus banana pseudo stem is commonly available agricultural waste to be used as lignocellulosic substrate. Present study focuses on exploitation of banana pseudo stem as a source for bioethanol production from the sugars released due to different chemical and biological pretreatments. Two fungal strains Aspergillus ellipticus and Aspergillus fumigatus reported to be producing cellulolytic enzymes on sugarcane bagasse were used under co-culture fermentation on banana pseudo stem to degrade holocellulose and facilitate maximum release of reducing sugars. The hydrolysate obtained after alkali and microbial treatments was fermented by Saccharomyces cerevisiae NCIM 3570 to produce ethanol. Fermentation of cellulosic hydrolysate (4.1 g%) gave maximum ethanol (17.1 g/L) with yield (84%) and productivity (0.024 g%/h) after 72 h. Some critical aspects of fungal pretreatment for saccharification of cellulosic substrate using A. ellipticus and A. fumigatus for ethanol production by S. cerevisiae NCIM 3570 have been explored in this study. It was observed that pretreated banana pseudo stem can be economically utilized as a cheaper substrate for ethanol production.

Banana Ovate Family Protein MaOFP1 and MADS-Box Protein MuMADS1 Antagonistically Regulated Banana Fruit Ripening

Liu, Juhua; Zhang, Jing; Hu, Wei; Miao, Hongxia; Zhang, Jianbin; Jia, Caihong; Wang, Zhuo; Xu, Biyu; Jin, Zhiqiang
Fonte: Public Library of Science Publicador: Public Library of Science
Tipo: Artigo de Revista Científica
Publicado em 17/04/2015 EN
Relevância na Pesquisa
26.42%
The ovate family protein named MaOFP1 was identified in banana (Musa acuminata L.AAA) fruit by a yeast two-hybrid (Y2H) method using the banana MADS-box gene MuMADS1 as bait and a 2 day postharvest (DPH) banana fruit cDNA library as prey. The interaction between MuMADS1 and MaOFP1 was further confirmed by Y2H and Bimolecular Fluorescence Complementation (BiFC) methods, which showed that the MuMADS1 K domain interacted with MaOFP1. Real-time quantitative PCR evaluation of MuMADS1 and MaOFP1 expression patterns in banana showed that they are highly expressed in 0 DPH fruit, but present in low levels in the stem, which suggests that simultaneous but different expression patterns exist for both MuMADS1 and MaOFP1 in different tissues and developing fruits. Meanwhile, MuMADS1 and MaOFP1 expression was highly stimulated and greatly suppressed, respectively, by exogenous ethylene. In contrast, MaOFP1 expression was highly stimulated while MuMADS1 was greatly suppressed by the ethylene competitor 1-methylcyclopropene (1-MCP). These results indicate that MuMADS1 and MaOFP1 are antagonistically regulated by ethylene and might play important roles in postharvest banana fruit ripening.

Small RNA Profiling of Two Important Cultivars of Banana and Overexpression of miRNA156 in Transgenic Banana Plants

Ghag, Siddhesh B.; Shekhawat, Upendra K. S.; Ganapathi, Thumballi R.
Fonte: Public Library of Science Publicador: Public Library of Science
Tipo: Artigo de Revista Científica
Publicado em 11/05/2015 EN
Relevância na Pesquisa
26.4%
Micro RNAs (miRNAs) are a class of non-coding, short RNAs having important roles in regulation of gene expression. Although plant miRNAs have been studied in detail in some model plants, less is known about these miRNAs in important fruit plants like banana. miRNAs have pivotal roles in plant growth and development, and in responses to diverse biotic and abiotic stress stimuli. Here, we have analyzed the small RNA expression profiles of two different economically significant banana cultivars by using high-throughput sequencing technology. We identified a total of 170 and 244 miRNAs in the two libraries respectively derived from cv. Grand Naine and cv. Rasthali leaves. In addition, several cultivar specific microRNAs along with their putative target transcripts were also detected in our studies. To validate our findings regarding the small RNA profiles, we also undertook overexpression of a common microRNA, MusamiRNA156 in transgenic banana plants. The transgenic plants overexpressing the stem-loop sequence derived from MusamiRNA156 gene were stunted in their growth together with peculiar changes in leaf anatomy. These results provide a foundation for further investigations into important physiological and metabolic pathways operational in banana in general and cultivar specific traits in particular.

Produção de polpa celulósica a partir de engaço de bananeira.; Pulp production from banana stem.

Soffner, Maria de Lourdes Aparecida Prudente
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 29/08/2001 PT
Relevância na Pesquisa
66.76%
O engaço de bananeira, suporte que sustenta o cacho de bananas, normalmente é descartado após a colheita da fruta, seja nas casas de embalagens (packing houses) ou em centros distribuidores, onde é considerado verdadeiro resíduo pelo grande volume gerado e por não ser aproveitado. Por essa razão e por constituir-se em material fibroso, o engaço foi avaliado para produção de polpa celulósica. O engaço in natura apresenta cerca de 93% de umidade e células de parênquima em abundância; em termos de composição química, o engaço apresenta 7,4% de lignina, 47,8% de extrativos totais, e 47,6% de holocelulose. Nesta pesquisa, a performance do engaço como matéria-prima para produção de polpa celulósica foi avaliada, usando o CaO como fonte álcali. Foram utilizadas lavagem e pré-extração aquosa (100 ºC, por 100 minutos) como pré-processos com o propósito de reduzir a grande quantidade de extrativos no bagaço do engaço de bananeira. O bagaço original e os materiais obtidos após os pré-processos foram submetidos à polpação com CaO com 8, 10, 12 e 14% de CaO, à temperatura de 120 ºC por 120 minutos em digestor rotativo. Para comparação foi utilizado o processo soda de polpação, sob as mesmas condições...

Structural characterization of stalk lignin from banana plant

Oliveira, L.; Evtuguin, D.; Cordeiro, N.; Silvestre, A.J.D.
Fonte: Elsevier Publicador: Elsevier
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
36.25%
Dioxane lignins from two fractions of banana plant 'Dwarf Cavendish' stalk (floral stalk (DL(FS)) and rachis (DL(R))) were structurally characterized by a set of spectroscopic (Ultraviolet (UV), FTIR, solid- and liquid-state NMR) and chemical degradation (permanganate (PC) and nitrobenzene oxidation (NO)) techniques. Despite both lignins are of HGS-type, strong structural differences were observed between them. Thus, DL(FS) showed almost twice the abundance of H and G units and almost half of the abundance of S units when compared to DLR. DLR possessed significantly higher amount of beta-O-4' structures (0.32/C(6) against 0.12/C(6)) and the molecular weight (5400 Da against 3750 Da) than those of DL(FS). About 72% of the condensed structures in DL(FS) are of beta-5 and 5-5' types, whereas 4-O-5'-diaryl ether structures were the most abundant condensed structures in DL(R). Most of H units in both lignins are terminal phenolic coumarates linked to lignin substructures by ester bonds. Both lignins are structurally associated with suberin-like components in cell wall tissues. Structural features of stalk lignin were discussed in terms of possible restrictions for the kraft pulping of integral stem material. (C) 2008 Elsevier B.V. All rights reserved.; FCT - BD/4749/2001

Heteroatom-enriched and renewable banana-stem-derived porous carbon for the electrochemical determination of nitrite in various water samples

Madhu, Rajesh; Veeramani, Vediyappan; Chen, Shen-Ming
Fonte: Nature Publishing Group Publicador: Nature Publishing Group
Tipo: Artigo de Revista Científica
Publicado em 23/04/2014 EN
Relevância na Pesquisa
36.13%
For the first time, high-surface-area (approximately 1465 m2 g−1), highly porous and heteroatom-enriched activated carbon (HAC) was prepared from banana stems (Musa paradisiaca, Family: Musaceae) at different carbonization temperatures of 700, 800 and 900°C (HAC) using a simple and eco-friendly method. The amounts of carbon, hydrogen, nitrogen and sulfur in the HAC are 61.12, 2.567, 0.4315, and 0.349%, respectively. Using X-ray diffraction (XRD), CHNS elemental analysis, X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy, the prepared activated carbon appears amorphous and disordered in nature. Here, we used HAC for an electrochemical application of nitrite (NO2−) sensor to control the environmental pollution. In addition, HAC exhibits noteworthy performance for the highly sensitive determination of nitrite. The limit of detection (LODs) of the nitrite sensor at HAC-modified GCE is 0.07 μM. In addition, the proposed method was applied to determine nitrite in various water samples with acceptable results.

Actinomicetos promotores de crescimento e agentes de biocontrole do nematoide cavernícola da bananeira Radopholus similis

Paixão, Lorena Bloisi Vaz Sampaio da
Fonte: Universidade Federal do Recôncavo da Bahia Publicador: Universidade Federal do Recôncavo da Bahia
Relevância na Pesquisa
26.57%
Os objetivos desse trabalho foram: qualificar a população bactérias totais e actinomícetos na rizosfera e raiz de plantas de bananeira; caracterizar os isolados de actinomicetos quanto á produção de enzimas extracelular; avaliar o potencial dos actinomicetos na promoção de crescimento de mudas de bananeira cv. William e o efeito de metabólitos secundários produzidos por estes microrganismos na mortalidade do nematóide cavernícola Radopholus símilis. As densidades populacionais de bactérias totais foram superiores as de actinomicetos e não variaram significativamente no solo rizosférico, em comparação com as raízes de plantas de bananeira. A caracterização fisiológica revelou que, dos isolados testados, 63,0%, 43,55 e 6,5% apresentam atividade celulolítica, xilanolítica, respectivas. Foi observado efeito de promoção de crescimento de mudas de bananeira pelos actinomicetos, o qual depende de isolado avaliado. Foram ofservados incrementos de até 46,2% na altura de musdas, 65,5% no diâmetro do pseudocaule, 283,6% produção de matéria seca da parte aérea e 447,5% na produção de matéria seca da raiz de mudas de bananeira produzidas em substrato inoculado e incubado com os actinomicetos. No segundo experimento...

Avaliação do coeficiente de variação e Relações entre caracteres de rendimento e desenvolvimento na cultura da caracteres de rendimento e desenvolvimento na cultura dacaracteres de rendimento e desenvolvimento na cultura da bananeira.

Rocha, Josimar
Fonte: Universidade Federal do Recôncavo da Bahia Publicador: Universidade Federal do Recôncavo da Bahia
Relevância na Pesquisa
26.55%
A banana é uma das frutas tropicais de maior importância econômica e social em todo o mundo, o Brasil ocupa a segunda colocação no ranking mundial dos maiores produtores, sendo produzida de norte a sul do país, desde a faixa litorânea até o planalto central, principalmente por pequenos produtores com baixos níveis de capitalização e tecnologia, que produzem frutos de má qualidade. O objetivo deste trabalho foi estabelecer faixas de coeficientes de variação para a cultura da bananeira, estabelecendo intervalos para a sua classificação em CVs baixos,médios, altos e muito altos e estudar as relações entre caracteres de bananeira avaliados em dois ciclos de produção. No estudo dos coeficientes de variação foram feitas pesquisas nas mais diversas literaturas que tratam de experimentação com a cultura da bananeira. Analisando também os critérios que devem ser levados em consideração para a redução do erro experimental, que está relacionado com os coeficientes de variação para cada variável. Para as relações entre caracteres foram calculados os coeficientes de correlação de Pearson entre 16 caracteres de rendimento e desenvolvimento da cultivar Tropical em dois ciclos de produção. Cada variável avaliada apresenta faixas de classificação dos coeficientes de variação específica. As variáveis diâmetro do fruto...

Detecção de variantes somaclonais de bananeira ´Prata Anã´ (AAB) micropropagada; Detection of somaclonal variants of micropropagated banana plants ´Prata Ana´ (AAB)

Silva, Janaína de Oliveira Costa e
Fonte: UNIVERSIDADE FEDERAL DE LAVRAS; DBI - Programa de Pós-graduação; UFLA; BRASIL Publicador: UNIVERSIDADE FEDERAL DE LAVRAS; DBI - Programa de Pós-graduação; UFLA; BRASIL
Tipo: Dissertação
Publicado em 25/08/2014 PT_BR
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The in vitro culture, also known as micropropagation, is a technique used in the attainment of plants with commercial value. This technique is useful in achievement for free pathogenic plants and to maintain the genetic characteristics of the mother plant. However, the micropropagation can lead to phenotypic changes in the plants, known as somaclonal variation. The somaclonal variation can reduce the production of commercial value plants, and this implies in limitations in the use of this technique. The ´Prata Anã´ banana plant presents as somaclonal variation an anomaly growth known as gigantism. The banana plant that possesses this variation produce bunches with low commercial value. However, the variation in ´Prata Anã´ is only verified after plantation. Aiming to reduce this problem the present work was carried out searching for an alternative way to differentiate normal ´Prata Anã´ banana plant from somaclonal variant ones. Morphological, anatomical and chemical markers that allowed differentiating the variants of the normal ones were used as tools. By the application of gibberellic acid (GA3) in the aerial parts of the plants in acclimatization phase it was possible distinguishing variant plants from the normal ones allowing the variant plants to grow bigger than the normal ones. Moreover...

Contribuição ao estudo da morfologia da bananeira (Musa spp): posição das gemas nas bases das bainhas foliares da planta; Contribution to the study of the morphology of the banana plant (Musa spp): bud position on the leaf sheat base of the plant

Lima, Vicente de Paula Maia Santos; Simão, Salim
Fonte: Universidade de São Paulo. Escola Superior de Agricultura Luiz de Queiroz Publicador: Universidade de São Paulo. Escola Superior de Agricultura Luiz de Queiroz
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; ; ; ; Formato: application/pdf
Publicado em 01/01/1971 POR
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O presente trabalho foi realizado em Piracicaba, São Paulo, Brasil. Os autores fizeram observações sôbre a posição que as gemas ocupam na base das bainhas das fôlhas da bananeira e às quais estão associadas. Utilizaram o cultivar Musa (Grupo AAA, Sub-Grupo Cavendish) "Nanicão", classificado de acôrdo com a nomenclatura de SIMMONDS (1966). Chegaram às seguintes conclusões: 1. As gemas associadas às bases das bainhas foliares estão colocadas em sua metade esquerda. 2. A metade direita das bainhas encobre as gemas colocadas mais internamente no caule da bananeira. 3. A disposição das gemas no caule é função da filotaxia da planta.; In this paper, result of studies conducted in Piracicaba, São Paulo, Brazil, the authors made observations about the position of the buds at the base of the leaf sheaths to which they are associated. They used the banana plant variety Musa (AAA Group, Cavendish Sub-Group) "Nanicão", classified according to SIMMONDS' nomenclature (1966). The following conclusions were drawn :(1) The buds at the base of the leaf sheaths are found on the left, at lateral position on the sheaths. (2) The right side of the sheaths covers the younger buds which are placed more internally on the banana stem. (3) The position of the buds in the banana stem is a function of the phyllotaxy of the plant.