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Registros recuperados: 15
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Association of endophytic diazotrophs in rice genotypes from varied soil environment and estimation of their biological nitrogen fixation potential using 15N dilution methods International Rice Research Institute
Malarvizhi, Palaniappa P..
195 leaves : ill. Thesis (Ph.D.) -- University of the Philippines at Los Baños
Tipo: Thesis Palavras-chave: Rice; Genotype; Rice soils; Nitrogen fixation; Endophytes.
Ano: 1995 URL: http://hdl.handle.net/123456789/654
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Bacterial community associated with autotrophic and heterotrophic cultures of medicinal plant smallanthus sonchifolius (Yacon). Repositório Alice
MORAES, R. M.; MELO, I. S. de; SUMYANTO, J.; CHANDRA, S.; JOSHI, V..
Several unfruitful attempts to grow axenic shoot cultures of Smallanthus sonchifolius, also known as yacon, were made before healthy shoots grew in association with bacteria on half strength Murashigue and Skoog media supplemented with 2.2 µM benzylaminopurine. Twenty-one bacterial isolates were obtained from in vitro S. sonchifolius plantlets, eight of these isolates were identified as Flavimonas oryzihabitans, Curtobacterium pusillum, Sphingomonas paucimobilis, and Microbacterium imperiale. These microorganisms produced indole acetic acid (IAA) at amounts varying between 8.89 to 47.45 µg/mL, reason for being classified as plant growth promoting bacteria (PGPB). The results show that buds associated with bacteria cultured on sucrose free media produced...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Yacon; IAA; Planta medicinal; Bactéria; Çido indolacético; Micropropagation; Endophytes; Smallanthus sonchifolius; Indole acetic acid.
Ano: 2012 URL: http://www.alice.cnptia.embrapa.br/handle/doc/941315
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Biological control of phytopathogenic fungi by endophytic actinomycetes isolated from maize (Zea mays l.). Repositório Alice
COSTA, F. G.; ZUCCHI, T. D.; MELO, I. S. de.
This work aimed a survey on the biodiversity of maize endophytic actinomycete, and an evaluation of their potential to control the phytopathogenic fungi. From several regions of São Paulo state, 40 strains were isolated from the healthy maize plants. The identification of these strains, based on morphological properties and fatty acid methyl ester (FAME) profile showed that most of them belonged to the Streptomyces genus. These isolates were first screened for the growth inhibition of phytopathogenic fungi and results showed that all the isolate were able to inhibit the development of at least one tested pathogen. Two selected isolates were then evaluated for the control of P. aphanidermatum in cucumber (Cucumis sativa L.) under greenhouse conditions....
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Endophytes; Actinomycete; Streptomyces; Dumping-off; Fungo; Pythium aphanidermatum; Doença de planta; Controle biológico; Bactéria; Actinomiceto; Milho.
Ano: 2013 URL: http://www.alice.cnptia.embrapa.br/handle/doc/979744
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Botânica: uma ciência básica ou aplicada? Rev. Bras. Bot.
AZEVEDO,JOÃO LÚCIO.
Exemplos de interações entre microrganismos endofíticos e suas plantas hospedeiras são usados para demonstrar a importância da Botânica no desenvolvimento da biotecnologia e para a preservação da biodiversidade. Como conclusão, uma visão holística da ciência atual torna irrelavante qualquer distinção entre aspectos básicos e aplicados da ciência, principalmente quando se consideram as ciências biológicas, como é o caso da Botânica.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Biotechnology; Biodiversity; Plant-microbes interactions; Endophytes.
Ano: 1999 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84041999000500002
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Can rhizobial inoculation promote rice growth through nitrogen fixation? International Rice Research Institute
Singh, R. K.; Mishra, R. P. N.; Jaiswal, H. K..
p.28-29
Palavras-chave: Dry matter; Endophytes; Growth; Inoculation; Nitrogen fixation; Nitrogen fixing bacteria; Rhizosphere bacteria; Rhizobium leguminosarum; India.
Ano: 2005 URL: http://hdl.handle.net/123456789/1158
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Caracterización cualitativa de frutos de rambutan (Nephelium lappaceum L.), almacenamiento postcosecha y patógenos asociados. Colegio de Postgraduados
Hernández Arenas, Marian Guadalupe.
El rambutan (Nephelium lappaceum L.) es un frutal tropical originario de Asia e introducido a México. Es cultivado principalmente en el estado de Chiapas pero su comercialización es limitada por una corta vida en anaquel, oscurecimiento del pericarpio y enfermedades postcosecha. Los objetivos de este trabajo fueron: 1) caracterizar frutos de cinco selecciones de rambután procedentes del estado de Chiapas; 2) estudiar el efecto de una cera y dos atmósferas modificadas a temperatura ambiente y refrigeración sobre la calidad visual y vida en anaquel de los frutos y 3) identificar el agente causal de la mancha negra del rambutan en postcosecha. Los frutos fueron cosechados entre Junio y Agosto del 2007 y 2008 en Tuxtla Chico, Chiapas. Se realizaron estudios de...
Palavras-chave: Calidad de frutos; Conservación postcosecha; Patógenos; Endófitos; Caracterización molecular; Fruit quality; Postharvest conservation; Pathogens; Endophytes; Molecular characterization; Doctorado; Fitopatología.
Ano: 2010 URL: http://hdl.handle.net/10521/155
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Caracterización cualitativa de frutos de rambutan (Nephelium lappaceum L.), almacenamiento postcosecha y patógenos asociados. Colegio de Postgraduados
Hernández Arenas, Marian Guadalupe.
El rambutan (Nephelium lappaceum L.) es un frutal tropical originario de Asia e introducido a México. Es cultivado principalmente en el estado de Chiapas pero su comercialización es limitada por una corta vida en anaquel, oscurecimiento del pericarpio y enfermedades postcosecha. Los objetivos de este trabajo fueron: 1) caracterizar frutos de cinco selecciones de rambután procedentes del estado de Chiapas; 2) estudiar el efecto de una cera y dos atmósferas modificadas a temperatura ambiente y refrigeración sobre la calidad visual y vida en anaquel de los frutos y 3) identificar el agente causal de la mancha negra del rambutan en postcosecha. Los frutos fueron cosechados entre Junio y Agosto del 2007 y 2008 en Tuxtla Chico, Chiapas. Se realizaron estudios de...
Palavras-chave: Calidad de frutos; Conservación postcosecha; Patógenos; Endófitos; Caracterización molecular; Fruit quality; Postharvest conservation; Pathogens; Endophytes; Molecular characterization; Doctorado; Fitopatología.
Ano: 2010 URL: http://hdl.handle.net/10521/155
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Dark septate endophytic pleosporalean genera from semiarid areas Naturalis
Knapp, D.G.; Kovács, G.M.; Zajta, E.; Groenwald, J.Z.; Crous, P.W..
Dark septate endophytes (DSE) are distributed worldwide as root-colonising fungi, and frequent in environments with strong abiotic stress. DSE is not a taxon, but constitutes numerous fungal taxa belonging to several orders of Ascomycota. In this study we investigate three unidentified DSE lineages belonging to Pleosporales that were found previously in semiarid sandy grasslands. For molecular phylogenetic studies seven loci (ITS, partial 18S nrRNA, 28S nrRNA, actin, calmodulin, transcription-elongation factor 1-α and ß-tubulin genes) were amplified and sequenced. Based on morphology and the resulting molecular phylogeny these isolates were found to represent three novel genera within the Pleosporales, namely Aquilomyces, Flavomyces and Darksidea, with eight...
Tipo: Article / Letter to the editor Palavras-chave: Dothideomycetes; Endophytes; Massarineae; Mating; Phylogeny; Sexual state; Taxonomy.
Ano: 2015 URL: http://www.repository.naturalis.nl/record/588702
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Detection of siderophores in endophytic bacteria Methylobacterium spp. associated with Xylella fastidiosa subsp. pauca. Repositório Alice
LACAVA, P.T.; SILVA-STENICO, M.E.; ARAÚJO, W.L.; SIMIONATO, A.V.C.; CARRILHO, E.; TSAI, S.M.; AZEVEDO, J.L..
The objective of this work was to study the production of siderophores by endophytic bacteria Methylobacterium spp., which occupy the same ecological niche as Xylella fastidiosa subsp. pauca (Xfp) in citrus plants. The siderophore production of Methylobacterium strains was tested according to chromeazurol agar assay test (CAS), Csáky test (hydroxamate-type) and Arnow test (catechol-type). In addition, the ability of Xfp to use siderophores, in vitro, produced by endophytic bacteria as source of iron, was evaluated. All 37 strains of Methylobacterium spp. tested were CAS-positive for siderophore production. Methylobacterium spp. produced hydroxamate-type, but not catechol-type siderophores. In vitro growth of Xfp was stimulated by the presence of...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Citrus variegated chlorosis; Endophytes; Heterologous siderophores; Iron; Symbionts; Clorose variegada dos citros; Endófitos; Sideróforos heterólogos; Ferro; Simbiose.
Ano: 2008 URL: http://www.alice.cnptia.embrapa.br/handle/doc/124234
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EFFECTS OF FUNGICIDES ON ENDOPHYTIC FUNGI AND PHOTOSYNTHESIS IN SEEDLINGS OF A TROPICAL TREE, Guarea guidonia (Meliaceae) Acta biol.Colomb.
GAMBOA GAITÁN,MIGUEL A.; WEN,SHIYUN; FETCHER,NED; BAYMAN,PAUL.
Endophytes are microorganisms that live within healthy plant tissues, and include fungi and bacteria. They can be mutualists, comensals or even latent pathogens. Presence of these endosymbionts may affect host physiology, for example by consuming products of photosynthesis (endophytes are heterotrophs) or producing toxic metabolites. In this work two fungicides were used to eliminate fungal endophytes from seedlings of Guarea guidonia. Lightsaturated photosynthesis (Amax) was measured in endophytefree plants and compared with control plants. Each fungicide killed different fungal endosymbionts. Phomopsis was more susceptible to benomyl while Colletotrichum was more susceptible to propiconazole. Although suggestive, values of Amax were not significantly...
Tipo: Journal article Palavras-chave: Endophytes; Tropics; Photosynthesis; Fungicides; Guarea.
Ano: 2005 URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2005000200003
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Endophytic and rhizospheric bacteria from Opuntia ficus-indica mill and their ability to promote plant growth in cowpea, Vigna unguiculata (L.) Walp. Repositório Alice
COSTA, F. E. C.; MELO, I. S. de.
ABSTRACT: Studies on the biodiversity of plants associated microorganisms play an important role in food production. Ficus-tree, Opuntia ficus-indica Mill, are cultivated in many nations worldwide intercropping with other cultures, like cowpea, Vigna unguiculata (L.) Walp. The objectives of this study were to isolate and determine the diversity of bacterial endophytes and rhizobacteria in cacti and their ability to solubilize phosphate, the nif presence, their ability to produce indole-acetic acid (IAA) and verify their efficacy to promote plant growth in cowpea plants. Bacteria were isolated from rhizospheric soils, from surface- sterilized stems and roots of plants collected in Brazil, in nitrogen- free medium, and identified through fatty acid analysis....
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Rhizosphere; Phosphate solubilization; Feijão caupi; Opuntia ficus-indica; Cacto; Bactéria; Rizosfera; Regulador de crescimento; Estimulante de crescimento vegetal; Feijão de corda; Vigna unguiculata; Endophytes; Cacti and succulents; Growth promotion; Rhizosphere; Ndole acetic acid.
Ano: 2012 URL: http://www.alice.cnptia.embrapa.br/handle/doc/942700
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ENZYMATIC AND ANTAGONIST ACTIVITY OF ENDOPHYTIC FUNGI FROM Sapindus saponaria L. (SAPINDACEAE) Acta biol.Colomb.
SANTOS,Caroline Menicoze dos; RIBEIRO,Amanda da Silva; GARCIA,Adriana; POLLI,Andressa Domingos; POLONIO,Julio Cesar; AZEVEDO,João Lúcio; PAMPHILE,João Alencar.
ABSTRACT Endophyte microorganisms have great biotechnological interest, with features applicable to different areas and are potentially useful in agriculture. The current study determines the biotechnological potential of endophytic fungi, isolated from leaves of Sapindus saponaria, to control phytopathogenic fungi and evaluate their enzyme production. Molecular taxonomy was performed by sequencing of the ITS1-5.8S-ITS2 ribosomal DNA region, identifying the genera Phomopsis, Sordariomycetes, Diaporthe, and Colletotrichum. In vitro antagonism against phytopathogens showed better results against Fusarium solani and provided inhibition indices between 41.8 % and 67.5 %. The endophytic strain SS81 (Diaporthe citri) presented the highest antagonism index...
Tipo: Journal article Palavras-chave: Biological control; Endophytes; Enzymes; Microbial antagonisms; Molecular taxonomy.
Ano: 2019 URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2019000200322
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Isolation and enzyme bioprospection of endophytic bacteria associated with plants of Brazilian mangrove ecosystem. Repositório Alice
CASTRO, R. A.; QUECINE, M. C.; LACAVA, P. T.; BATISTA, B. D.; LUVIZOTTO, D. M.; MARCON, J.; FERREIRA, A.; MELO, I. S. de; AZEVEDO, J. L..
Abstract: The mangrove ecosystem is a coastal tropical biome located in the transition zone between land and sea that is characterized by periodic flooding, which confers unique and specific environmental conditions on this biome. In these ecosystems, the vegetation is dominated by a particular group of plant species that provide a unique environment harboring diverse groups of microorganisms, including the endophytic microorganisms that are the focus of this study. Because of their intimate association with plants, endophytic microorganisms could be explored for biotechnologically significant products, such as enzymes, proteins, antibiotics and others. Here, we isolated endophytic microorganisms from two mangrove species, Rhizophora mangle and Avicennia...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Mangrove; Endophytes; Bacteria; Biotechnological potential; Enzymes; Bactéria; Enzima; Mangue; Endophytes; Bacteria; Mangrove forests; Enzymes.
Ano: 2014 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1003307
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Raízes de Musa spp. hospedam fungos endofíticos com potencial de controle de Fusarium oxysporum f. sp. cubense. Repositório Alice
SALCEDO, A. I.; SCHILY, A.; MACHADO, L.; CHAVES, N.; ALVES, H. S.; STAVER, C.; RODRIGUEZ, M. A. D..
Aiming to understand the role of root-associated endophytic fungi against Fusarium oxysporum f. sp. cubense (Foc) we screened 25 non-commercial genotypes of Musa spp. from field collections in Brazil and Costa Rica. Analyses of Tefa-1? and/or ITS genome regions of the 150 isolates obtained revealed that most frequent genera were Trichoderma spp. and F. oxysporum. Fungi such as Gloeotinia temulenta and others isolates with no significant similarities to the database analysed are potentially new descriptions. Some genera were more frequent or uniquely found on certain genotypes, but endophyte-host specificity needs to be verified. Antagonism tests against Foc revealed that most Trichoderma isolates are better competitors than Foc in vitro. T. asperellum...
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Panama disease; Endophytes; Musa.
Ano: 2016 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1068008
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Uso de diferentes fontes de carbono por estirpes de Gluconacetobacter diazotrophicus isoladas de cana-de-açúcar. Repositório Alice
BARBOSA, E.A.; PERIN, L.; REIS, V.M..
O objetivo deste trabalho foi quantificar a população de Gluconactobacter diazotrophicus presente em plântulas de 34 variedades de cana-de-açúcar, e caracterizar os isolados quanto à capacidade de utilizar diversas fontes de carbono e formar pigmento róseo em presença de luz. A população de G. diazotrophicus foi quantificada pela técnica do número mais provável e isolada em meios de cultura semi-seletivos. A população de G. diazotrophicus foi maior no sistema radicular do que na parte aérea, e maior nas variedades brasileiras de cana-de-açúcar. Os isolados utilizaram poucas fontes de carbono, e aqueles obtidos do sistema radicular utilizaram maior número de fontes, em comparação aos da parte aérea. Apenas a estirpe padrão Ppe-4 e quatro outros isolados...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Diversidade; Bactérias diazotróficas; Endófitos; Diversity; Diazotrophic bacteria; Endophytes.
Ano: 2006 URL: http://www.alice.cnptia.embrapa.br/handle/doc/118976
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