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| Urashima,Alfredo Seiiti. |
| Resistant varieties have been the preferred means to control Magnaporthe grisea, the causal organism of the rice blast disease. The objective of this study was to examine the degree of diversity of the pathogen in different rice growing regions of São Paulo State, Brazil. Blast samples collected from rice varieties in three different regions (Tremembé, Mococa and José Bonifácio) were analyzed for race structure employing the Japanese rice differentials. The highest degree of virulence diversity was observed in Tremembé with 22 different races in three different varieties. Furthermore, no resistance gene in the Japanese differentials was effective to all isolates of M. grisea from São Paulo State. |
| Tipo: Info:eu-repo/semantics/report |
Palavras-chave: Pyricularia; Genes; Disease resistance; Pathogenicity. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2002000100015 |
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| Felipe,Rafaella Teles Arantes; Mourão Filho,Francisco de Assis Alves; Lopes,Silvio Aparecido; Mendes,Beatriz Madalena Januzzi; Behling,Maurel; Pereira Junior,Ernani Vicente. |
| The objective of this work was to evaluate the reaction of four sweet orange cultivars expressing the attacin A gene to 'Candidatus Liberibacter asiaticus' (Las) infection, a bacterium associated to huanglongbing (HLB) disease. Transgenic sweet orange plants of Hamlin, Natal, Pêra, and Valência cultivars, as well as nontransgenic controls received inocula by grafting budwood sections of HLB-infected branches. Disease progression was evaluated through observations of leaf symptoms and by polymerase chain reaction (PCR) analysis, eight months after inoculation. A completely randomized design was used, with four experiments (one for each cultivar) performed simultaneously. Bacteria title was estimated by quantitative PCR (qPCR). HLB symptoms and Las titers... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Citrus sinensis; Antibacterial peptide; Disease resistance; Genetic transformation; Huanglongbing. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2013001100004 |
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| Koga,Lucimara Junko; Bowen,Charles Roger; Godoy,Claudia Vieira; Oliveira,Maria Cristina Neves de; Hartman,Glen Lee. |
| The objective of this work was to evaluate the genetic diversity among Sclerotinia sclerotiorum isolates from Brazil and the USA, assess their aggressiveness variability, and verify the existence of an isolate-cultivar interaction. Isolate variability was determined by mycelial compatibility grouping (MCG), and isolate aggressiveness by cut-stem inoculations of soybean cultivars. Two experiments for MCGs and two for aggressiveness were conducted with two sets of isolates. The first set included nine isolates from the same soybean field in Brazil and nine from the Midwest region of the USA. The second set included 16 isolates from several regions of Brazil and one from the USA. In the first set, 18 isolates formed 12 different MCGs. In the second set, 81%... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Glycine max; Sclerotinia stem rot; Disease resistance; Screening of cultivars; White mold. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2014000400265 |
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| Leite,Regina Maria Villas Bôas de Campos; Oliveira,Maria Cristina Neves de. |
| Abstract:The objective of this work was to evaluate the suitability of the multivariate method of principal component analysis (PCA) using the GGE biplot software for grouping sunflower genotypes for their reaction to Alternaria leaf spot disease (Alternariaster helianthi), and for their yield and oil content. Sixty-nine genotypes were evaluated for disease severity in the field, at the R3 growth stage, in seven growing seasons, in Londrina, in the state of Paraná, Brazil, using a diagrammatic scale developed for this disease. Yield and oil content were also evaluated. Data were standardized using the software Statistica, and GGE biplot was used for PCA and graphical display of data. The first two principal components explained 77.9% of the total... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Alternariaster helianthi; Helianthus annuus; Disease resistance; Principal component analysis. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2015000800649 |
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| Gardner, Justin G.; Eastwood, David B.; Brooker, John R.; Klingeman, William E.. |
| This article summarizes a study of consumers' willingness to pay (WTP), in urban areas in Tennessee, Mississippi, and Michigan, for a powdery mildew resistant dogwood tree. Powdery mildew is a disease affecting flowering dogwoods that can limit growth, detract from the appearance, and may cause plant decline and death. Study objectives were to provide information about consumers' WTP and to identify potential marketing strategies for the introduction of the disease-resistant tree. On average, survey respondents indicated they are willing to pay a $13.35 premium for a flowering dogwood tree which is resistant to powdery mildew. Regression results led to inferences that the presence of dogwoods in a respondent's yard, presence of dogwoods infected with... |
| Tipo: Journal Article |
Palavras-chave: Contingent valuation; Disease resistance; Dogwood; Marketing; Maximum likelihood; Nursery; Powdery mildew; Crop Production/Industries; Marketing. |
| Ano: 2003 |
URL: http://purl.umn.edu/14676 |
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| Pray, Carl E.. |
| This report reviews the impacts of the Asian Maize Biotechnology Network (AMBIONET), organized by the International Maize and Wheat Improvement Center (CIMMYT) with funding from the Asian Development Bank to strengthen the capacity of public maize research institutions in China, India, Indonesia, Philippines, Thailand, and Vietnam to produce high-yielding, disease resistant, stress tolerant maize cultivars. It was found that, during its lifetime (1998-2005), AMBIONET clearly benefited researchers and institutions in participating countries, as well as CIMMYT. In addition, there was good progress toward developing improved cultivars. Asian farmers are just beginning to gain from the work, but their future benefits will likely pay for AMBIONET’s relatively... |
| Tipo: Report |
Palavras-chave: Zea mays; Plant breeding; Biotechnology; Breeding methods; Research methods; Disease resistance; Yield increases; Research institutions; China; India; Indonesia; Philippines; Thailand; Viet Nam; Asia; Crop Production/Industries; Research and Development/Tech Change/Emerging Technologies; F30; F01. |
| Ano: 2006 |
URL: http://purl.umn.edu/56103 |
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| Nogueira,Danilo Gustavo; Carvalho,Regis de Castro; Maluf,Wilson Roberto; Nogueira,Douglas Willian; Ticona-Benavente,César Augusto. |
| ABSTRACT The aim of this study was to develop bell pepper hybrids with resistance to multiple pathogens and make inferences in regard to components of heterosis in hybrids obtained from lines presumed to be resistant to Pepper yellow mosaic virus (PepYMV), Phytophthora capsici, or Meloidogyne incognita. The studies were carried out in a greenhouse. We used ten lines, thirty experimental hybrids, and seven controls (Konan-R, Magali-R, Martha-R, Stephany, Mallorca, Magnata Super, and Criollo de Morelos-334). For all experiments, a randomized block design was used with three replications (with plots composed of 16 plants). For evaluation of the reactions to P. capsici and to PepYMV, the percentages of asymptomatic plants were considered. For evaluation of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Capsicum annuum; Disease resistance; Plant breeding. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902018000100093 |
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| Sundar, A. Ramesh; Ashwin, N.M.R.; Barnabas, E. Leonard; Malathi, P.; Viswanathan, R.. |
| Sugarcane is one of the important commercial crops cultivated world-wide both under tropical and sub-tropical conditions. The crop gains economic importance by virtue of its industrial potential in terms of products like crystal white sugar, bagasse, pressmud, power etc. Among the various production constraints of the crop, diseases are seen as a major threat for sustaining the productivity of sugarcane. Conventional Breeding is a lengthy process and it involves almost more than 10 years for the release of a commercial variety. Many varieties with superior agronomical traits have succumbed to diseases like red rot and smut during the course of cultivation, which hitherto at the time of release were rated to be resistant. The breakdown of disease resistance... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Sugarcane; Disease resistance; Red rot; Smut.. |
| Ano: 2015 |
URL: http://e-revista.unioeste.br/index.php/scientiaagraria/article/view/12829 |
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| Mathioni,Sandra Marisa; Carvalho,; Brunelli,Kátia Regiane; Beló,André; Camargo,Luis Eduardo Aranha. |
| For many years, the gray leaf spot disease (GLS) caused by the fungus Cercospora zeae-maydis Tehon & Daniels, was not considered an important pathogen of maize (Zea mays, L.) in Brazil. However, the recent adoption of agronomical practices such as no-tillage and cultivation under central pivot irrigation systems increased the incidence and severity to the extent that GLS is now one of the most important diseases of maize. Isolates of C. zeae-maydis can be distinguished by two genetic groups (I and II) based on AFLP markers and on polymorphisms of the ITS and 5.8S rDNA regions. Until now, however, the biological implications of this distinction remain unclear. This study investigated whether isolates from the two genetic groups differ in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Disease resistance; Gray leaf spot; Genetic variability; Pathogenicity. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000600006 |
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| Pereira,Mônica Juliani Zavaglia; Ramalho,Magno Antonio Patto; Abreu,Ângela de Fátima Barbosa. |
| Aiming to obtain information concerning the genetic control of the resistance of the bean (Phaseolus vulgaris L.) to the fungus Fusarium oxysporum f. sp. phaseoli, six crosses involving three resistant lines (Carioca MG, Esal 583 and Esal 566) and four susceptible to the fungus (Carioca, CNFC 10443, Uirapuru and Esal 522) were developed. The parental lines, the controls (Carioca MG and Carioca) and the F1, F2 and F3 generations were evaluated for reaction to Fusarium. For inoculation, root cuttings were immersed in a spore suspension. The evaluations were performed at 21 days after inoculation, by scale of notes ranging from 1.0, to 9.0 and genetic and phenotypic parameters were estimated. The heritability in the narrow sense ranged from 0.34 to 0.42 and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Phaseolus vulgaris; Fusarium wild; Disease resistance. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000600010 |
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| Medeiros,José Gilberto Sousa; Citadin,Idemir; Santos,Idalmir dos; Assmann,André Paulo. |
| Bacterial leaf spot (BLS), caused by Xanthomonas arboricola pv. pruni, is one of the most important diseases in Brazilian peach [Prunus persica (L.) Batsch] orchards and all over the world. The main objective of this study was to evaluate for BLS sensitivity of peach genotypes. Evaluations of thirty genotypes were carried out during the onset of the disease, for incidence, severity and defoliation, in field conditions. Pearson's correlations between the percentage of defoliation and leaf severity rating were performed. Genotypes 'Conserva 985', 'Conserva 871', 'Conserva 1129', and 'Tropic Snow', as resistance sources, and 'Conserva 1153', 'Bonão', 'Conserva 1125', and 'Atenas', as susceptible to BLS, were submitted to detached-leaf bioassay and greenhouse... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Disease resistance; Disease severity. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000100009 |
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| Fritsche-Neto,Roberto; Souza,Thiago Lívio Pessoa Oliveira de; Pereira,Helton Santos; Faria,Luís Cláudio de; Melo,Leonardo Cunha; Novaes,Evandro; Brum,Itaraju Junior Baracuhy; Jannink,Jean-Luc. |
| ABSTRACT: Despite important biotic stresses to common bean, Anthracnose (ANT) and Angular Leaf Spot (ALS) can cause losses of up to 80 % and occur in more than 60 countries around the world. Genetic resistance is the most sustainable strategy to manage these diseases. Thus, we aimed to (1) identify new SNP markers associated with ALS and ANT resistance loci in elite common bean lines, and (2) provide a functional characterization of the DNA sequences containing the identified SNP markers. We evaluated 60 inbred lines, under field conditions, which represent the elite germplasm developed by the Embrapa common bean breeding program across 22 years, in terms of severity of the ALS and ANT. The lines were genotyped with 5,398 SNPs. Then, a Mixed Linear Model... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Colletotrichum lindemuthianum; Pseudocercospora griseola; Disease resistance; Elite lines; Marker-assisted selection. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001400321 |
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| Registros recuperados: 144 | |
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