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	Provedor de dados Trop. Plant Pathol. (4) Autor Araújo,Leila G. (4) Prabhu,Anne S. (4) Silva,Gisele B. (2) Silva,Gisele B. da (1) Trindade,Maria G. (1) Zambolim,Laércio (1) Zimmermann,Francisco J.P. (1) Mais... Palavra-chave Oryza sativa (4) Magnaporthe grisea (3) Rice blast (3) Pathotypes (2) Cultura de tecido (1) Genetic diversity (1) Physiologic races (1) Population dynamics (1) Pyricularia grisea (1) Resistance (1) Variação somaclonal (1) Virulence (1) Mais... Tipo do documento Info:eu-repo/semantics/article (4) Ano 2007 (2) 2005 (1) 2004 (1) País Brazil (4) Idioma Inglês (3) Português (1)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 4 Primeira ... 1 ... Última Virulence and rep-PCR analysis of Pyricularia grisea isolates from two Brazilian upland rice cultivars Trop. Plant Pathol. Prabhu,Anne S.; Araújo,Leila G.; Silva,Gisele B.; Trindade,Maria G.. The phenotypic and genetic diversity of 77 isolates of Pyricularia grisea collected from two upland rice cultivars, Maravilha and Primavera, was studied. Isolates exhibiting compatible reaction to cv.Primavera were incompatible to cv.Maravilha and vice versa, with the exception of six isolates that were compatible to both cultivars. The virulence of isolates from cv. Maravilha on 32 test genotypes of rice was significantly higher (t = 9.09, p < 0.0001) than the isolates from cv.Primavera. A phenogram constructed from virulence data showed two main groups, one constituted mainly of isolates from cv.Primavera (97.6%) and the other of isolates from cv.Maravilha (91.17%). Rep-PCR analysis of isolates using two primers designed from sequences of Pot2 showed... Tipo: Info:eu-repo/semantics/article Palavras-chave: Oryza sativa; Rice blast; Magnaporthe grisea; Pathotypes; Genetic diversity. Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582007000100002 Virulence pattern of Pyricularia grisea isolates from farmers' fields on newly released upland rice cultivars Trop. Plant Pathol. Araújo,Leila G.; Prabhu,Anne S.; Silva,Gisele B. da. The virulence pattern of the isolates of Pyricularia grisea from commercial fields of the upland rice (Oryza sativa) cultivars 'Primavera' and 'BRS Bonança' was analyzed. A hundred and seventy monoconidial isolates of the pathogen virulent to 'Primavera' and 139 to 'BRS Bonança' collected from eight fields, during two years (2001-2003) were tested, under greenhouse conditions, on six newly released rice cultivars. Differences in virulence pattern were observed in pathogenic populations of 'Primavera' and 'BRS Bonança'. Isolates with virulence to improved cultivars were common in samples from farmers' fields in the absence of aloinfection. The virulence frequency of P. grisea isolates collected from 'Primavera'' to cultivars 'BRS Vencedora', 'BRS Colosso',... Tipo: Info:eu-repo/semantics/article Palavras-chave: Oryza sativa; Magnaporthe grisea; Rice blast; Physiologic races; Resistance. Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582005000600009 Resistência parcial à brusone em somaclones da cultivar de arroz CICA-8 Trop. Plant Pathol. Araújo,Leila G.; Prabhu,Anne S.. A obtenção de novas fontes de resistência à brusone é requerimento básico para melhoramento do arroz (Oryza sativa). O objetivo do trabalho foi avaliar, para resistência à brusone, 39 somaclones da cultivar CICA-8, desenvolvidos a partir de calos de panículas imaturas. Os somaclones, nas gerações avançadas de R5 a R7, foram avaliados sob condições naturais de infecção e em testes de inoculação artificial em casa de vegetação, utilizando cinco isolados, pertencentes a quatro patótipos (ID-14, II-1, IB-1 e IB-45) de Pyricularia grisea. No viveiro de brusone os somaclones apresentaram diferentes reações à doença. Nos testes de inoculação os somaclones mostraram interação diferencial com os isolados do patógeno. Dois isolados altamente virulentos a cinco... Tipo: Info:eu-repo/semantics/article Palavras-chave: Magnaporthe grisea; Oryza sativa; Cultura de tecido; Variação somaclonal. Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582004000400006 Estimation of phenotypic diversity in field populations of Magnaporthe grisea from two upland rice cultivars Trop. Plant Pathol. Silva,Gisele B.; Zambolim,Laércio; Prabhu,Anne S.; Araújo,Leila G.; Zimmermann,Francisco J.P.. The phenotypic diversity of Magnaporthe grisea was evaluated based on leaf samples with blast lesions collected from eight commercial fields of the upland rice cultivars 'BRS Primavera' and 'BRS Bonança', during the growing seasons of 2001/2002 and 2002/2003, in Goias State. The number of M. grisea isolates from each field utilized for virulence testing varied from 28 to 47. Three different indices were used based on reaction type in the eight standard international differentials and eight Brazilian differentials. The M. grisea subpopulations of ´Primavera' and 'Bonança', as measured by Simpson, Shannon and Gleason indices, showed similar phenotypic diversities. The Simpson index was more sensitive relation than those of Shannon and Gleason for pathotype... Tipo: Info:eu-repo/semantics/article Palavras-chave: Oryza sativa; Pyricularia grisea; Population dynamics; Rice blast; Pathotypes; Virulence. Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582007000100001 Registros recuperados: 4 Primeira ... 1 ... Última

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