Base de dados : LILACS
Pesquisa : B01.300.107.575 [Categoria DeCS]
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Id: biblio-998440
Autor: Durante, Lucas Gustavo Yock; Bacchi, Lilian Maria Arruda; Souza, Jessica Evangelista de; Graichen, Felipe André Sganseria.
Título: Reaction of wheat plants and alternative hosts to Magnaporthe oryzae / Reação de plantas de trigo e hospedeiros alternativos a Magnaporthe oryzae
Fonte: Arq. Inst. Biol;85:e0952017, 2018. tab.
Idioma: en.
Resumo: Blast disease, caused by the fungus Magnaporthe oryzae, has a major impact on wheat farming. The study of plant responses to pathogens has improved the management of this disease. Moreover, it is important to identify potential host plants in the crops' vicinity and to understand reactions caused by plant-pathogen interactions. The objective of this study was to assess the histopathology of wheat plants, Digitaria insularis and Digitaria sanguinalis inoculated with M. oryzae isolates obtained either rice or wheat plants. Thirty-three days after sowing, greenhouse-grown plants of all three species were inoculated with each M. oryzae isolate. The observed effects (48 hours after inoculation) differed depending on the particular interaction between each pathogen isolate-plant species pair. For instance, wheat and D. sanguinalis had the weakest defensive response against spore germination, production of melanized appressoria, and appressorial penetration, with average values above 87, 90, and 43%, respectively, for these events in these plants. Furthermore, germination and appressoria melanization were more aggressive in the rice isolate than in the wheat isolate. Additionally, evidence for a defensive response (such as cell death) was observed in wheat plants inoculated with rice isolates. However, such a response was absent in plants inoculated using wheat isolates, presumably because pathogen recognition failed.(AU)

A brusone é uma doença causada pelo fungo Magnaporthe oryzae e de grande impacto para a triticultura. O estudo das respostas da planta aos patógenos tem auxiliado no manejo das doenças, e a identificação das plantas hospedeiras nas proximidades da lavoura é importante, assim como conhecer as reações de interação com o patógeno. O objetivo deste estudo foi determinar os eventos histológicos de plantas de trigo Digitaria insularis e Digitaria sanguinalis inoculadas com isolados de M. oryzae de plantas de arroz e trigo. Aos 33 dias da semeadura, as plantas cultivadas em estufa foram inoculadas com dois isolados de M. oryzae. O efeito observado nas plantas, 48 horas após a inoculação, mostrou interações diferentes para cada isolado do patógeno e entre as espécies de plantas. As plantas de trigo e D. sanguinalis foram os materiais com menores respostas de defesa à germinação, de produção de apressórios melanizados e penetração do apressório, com valores acima de 87, 90 e 43%, respectivamente. Entre os isolados do patógeno, o mais agressivo para germinação e produção de apressório melanizado foi o proveniente de plantas de arroz. A resposta de defesa da planta, como a morte celular, foi observada nas plantas de trigo inoculadas com isolado proveniente de plantas de arroz, enquanto não houve resposta de defesa da planta quando inoculada com isolado obtido de plantas de trigo, provavelmente por não ocorrer o reconhecimento do patógeno.(AU)
Descritores: Oryza
Triticum
Magnaporthe/patogenicidade
Pyricularia grisea
-Controle de Pragas
Fungos
Responsável: BR1942.1 - NID - Biblioteca - Núcleo de Informação e Documentação


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Id: lil-775130
Autor: Lou, Jingfeng; Yu, Ruiting; Wang, Xiaohan; Mao, Ziling; Fu, Linyun; Liu, Yang; Zhou, Ligang.
Título: Alternariol 9-methyl ether from the endophytic fungus Alternaria sp. Samif01 and its bioactivities
Fonte: Braz. j. microbiol;47(1):96-101, Jan.-Mar. 2016. tab, graf.
Idioma: en.
Projeto: National Basic Research Program of China; . Hi-Tech R&D Program of China.
Resumo: Abstract One bioactive compound, identified as alternariol 9-methyl ether, was isolated from the crude extract of the endophytic fungus Alternaria sp. Samif01 residing in the roots of Salvia miltiorrhiza Bunge. Alternariol 9-methyl ether was active against bacteria with minimum inhibitory concentration values ranging from 25 to 75 µg/mL and median inhibitory concentration (IC50) values ranging from 16.00 to 38.27 µg/mL. The IC50 value of alternariol 9-methyl ether against spore germination of Magnaporthe oryzae was 87.18 µg/mL. Alternariol 9-methyl ether also showed antinematodal activity against Bursaphelenchus xylophilus and Caenorhabditis elegans with IC50 values of 98.17 µg/mL and 74.62 µg/mL, respectively. This work is the first report on alternariol 9-methyl ether and its biological activities from the endophytic fungus Alternaria sp. Samif01 derived from S. miltiorrhiza Bunge. The results indicate the potential of Alternaria sp. Samif01 as a source of alternariol 9-methyl ether and also support that alternariol 9-methyl ether is a natural compound with high potential bioactivity against microorganisms.
Descritores: Alternaria/química
Anti-Infecciosos/isolamento & purificação
Endófitos/química
Lactonas/isolamento & purificação
-Alternaria/isolamento & purificação
Anti-Infecciosos/metabolismo
Bactérias/efeitos dos fármacos
Endófitos/isolamento & purificação
INHIBITORY CONCENTRATION ACADEMIES AND INSTITUTES
Lactonas/metabolismo
Testes de Sensibilidade Microbiana
Magnaporthe/efeitos dos fármacos
Nematoides/efeitos dos fármacos
Raízes de Plantas/microbiologia
Salvia/microbiologia
Limites: Animais
Responsável: BR1.1 - BIREME


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Id: lil-417613
Autor: Faria-Campos, A. C; Cerqueira, G. C; Anacleto, C; Carvalho, C. M. de; Ortega, J. M.
Título: Mining microorganism EST databases in the quest for new proteins
Fonte: Genet. mol. res. (Online);2(1):169-177, Mar. 2003.
Idioma: en.
Resumo: Microorganisms with large genomes are commonly the subjects of single-round partial sequencing of cDNA, generating expressed sequence tags (ESTs). Usually there is a great distance between gene discovery by EST projects and submission of amino acid sequences to public databases. We analyzed the relationship between available ESTs and protein sequences and used the sequences available in the secondary database, clusters of orthologous groups (COG), to investigate ESTs from eight microorganisms of medical and/or economic relevance, selecting for candidate ESTs that may be further pursued for protein characterization. The organisms chosen were Paracoccidioides brasiliensis, Dictyostelium discoideum, Fusarium graminearum, Plasmodium yoelii, Magnaporthe grisea, Emericella nidulans, Chlamydomonas reinhardtii and Eimeria tenella, which have more than 10,000 ESTs available in dbEST. A total of 77,114 protein sequences from COG were used, corresponding to 3,201 distinct genes. At least 212 of these were capable of identifying candidate ESTs for further studies (E. tenella). This number was extended to over 700 candidate ESTs (C. reinhardtii, F. graminearum). Remarkably, even the organism that presents the highest number of ESTs corresponding to known proteins, P. yoelii, showed a considerable number of candidate ESTs for protein characterization (477). For some organisms, such as P. brasiliensis, M. grisea and F. graminearum, bioinformatics has allowed for automatic annotation of up to about 20 of the ESTs that did not correspond to proteins already characterized in the organism. In conclusion, 4093 ESTs from these eight organisms that are homologous to COG genes were selected as candidates for protein characterization
Descritores: Bases de Dados de Proteínas
Etiquetas de Sequências Expressas
Análise de Sequência de Proteína
-Chlamydomonas reinhardtii/genética
Dictyostelium/genética
Eimeria tenella/genética
Emericella/genética
Fusarium/genética
Genoma
Magnaporthe/genética
Paracoccidioides/genética
Plasmodium yoelii/genética
Proteínas/genética
Homologia de Sequência de Aminoácidos
Limites: Animais
Tipo de Publ: Research Support, U.S. Gov't, Non-P.H.S.
Responsável: BR1.1 - BIREME



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