Consulta: subjectFacets:"Genetic resistance"
Registros recuperados: 47
Data/hora: 10/06/2024 03:34:41

Resistencia a pudrición de mazorca en poblaciones de maíz bajo mejoramiento participativo en el Altiplano de México
Provedor de dados: Depósito Institucional Abierto de Documentos Digitales del Colegio de Postgraduados (COLPOS DIGITAL )
Autores: Briones Reyes, Dolores.
Con el objeto de evaluar la resistencia genética a la pudrición de la mazorca de nueve ciclos de selección de cada una de tres poblaciones de maíz Chalqueño (Azul, Palomo y Crema), y de determinar la distribución y virulencia de las especies de hongos causantes de la pudrición, se colectaron 26 muestras de mazorcas con y sin síntomas de pudrición en tres zonas de los Estados de México, Tlaxcala y Puebla. La evaluación de la resistencia se hizo en tres localidades, utilizando la mezcla de 15 aislamientos colectados en la región Chalco-Juchitepec, que fueron inoculados en los jilotes entre 7 y 10 días después de la emisión de los estigmas. La severidad de la enfermedad se evaluó a la cosecha, utilizando la escala 1 a 5 de acuerdo al porcentaje de infección....
Tipo: Tesis
Palavras-chave: Ciclos de selección; Fusarium; Resistencia genética; Pudrición de mazorca; Virulencia; Maestría; Genética; Selection cycles; Genetic resistance; Ear rot; Virulence.
Ano: 2007
URL: http://hdl.handle.net/10521/1660

Detección e incidencia del fitoplasma Maize Bushy Stunt y su relación con el rendimiento en maíz en el Estado de Veracruz, México
Provedor de dados: Depósito Institucional Abierto de Documentos Digitales del Colegio de Postgraduados (COLPOS DIGITAL )
Autores: Alcántara Mendoza, Susana.
Una nueva enfermedad del maíz apareció en el estado de Veracruz, México durante 2003-2004. Síntomas de amarillamiento, enrojecimiento y posterior quemado de hojas, proliferación de mazorcas, jilotes raquíticos, falta de fecundación y granos vanos fueron parte del síndrome de la enfermedad. El fitoplasma Maize Bushy Stunt (MBS) se identifico por PCR se detectó en plantas con los síntomas antes descritos, en los municipios de Tlalixcoyan, Cosoleacaque y Paso de Ovejas en 2006 y 2007. Los genotipos CP-562, 30F83, 30F92, Orca, 30F96, Nutria y Asgrow 7573 resultaron positivos a la presencia del MBS, mientras que en 3086, 30F97 y CP-560 no se detectó la presencia del MBS en una plantación experimental en plantas sintomáticas en Tlalixcoyan, Ver. en 2006 y 2007....
Tipo: Tesis
Palavras-chave: Maize Bushy Stunt; PCR; Incidencia; Resistencia genética; Genoma y  homología; Maestría; Fitopatología; Maize Bushy Stunt; Incidence; Genetic resistance; Genome and homology.
Ano: 2009
URL: http://hdl.handle.net/10521/1574

Carcterización biológica de chiles criollos (Capsicum annuum L.) del sur del estado de Puebla
Provedor de dados: Depósito Institucional Abierto de Documentos Digitales del Colegio de Postgraduados (COLPOS DIGITAL )
Autores: Morán Bañuelos, Sara Hirán.
Dado el valor agronómico y cultural del chile en México se planteó el estudio de la  diversidad biológica del chile criollo (Capsicum annuum L.) en el estado de Puebla,  mediante la caracterización y evaluación de 43 poblaciones en términos de su variación  morfológica, en el contenido de capsaicinoides y la resistencia genética al fitopatógeno  Phythophthora capsici Leo. El análisis multivariado considerando 41 atributos  morfológicos permitió la clasificación de las poblaciones en los tipos: Miahuateco,  Poblano, Copi y criollos de Tecomatlán, con base en su hábito de crecimiento, la posición,  forma y longitud de la corola, así como en el tamaño, forma y coloración de los frutos en el  estado maduro. Por su contenido de capsaicinoides hubo diferencias...
Tipo: Tesis
Palavras-chave: Chile Miahuateco; Chile Poblano; Chile Copi; Criollos de Tecomatlán; Capsaicinoides; Resistencia genética; Doctorado; Genética; Miahuateco pepper; Poblano pepper; Copi pepper; Chili pepper landraces from Tecomatlán; Capsaicinoids; Genetic resistance.
Ano: 2008
URL: http://hdl.handle.net/10521/1411

Detección e incidencia del fitoplasma Maize Bushy Stunt y su relación con el rendimiento en maíz en el estado de Veracruz, México
Provedor de dados: Depósito Institucional Abierto de Documentos Digitales del Colegio de Postgraduados (COLPOS DIGITAL )
Autores: Alcántara Mendoza, Susana.
Una nueva enfermedad del maíz apareció en el estado de Veracruz, México durante 2003-2004. Síntomas de amarillamiento, enrojecimiento y posterior quemado de hojas, proliferación de mazorcas, jilotes raquíticos, falta de fecundación y granos vanos fueron parte del síndrome de la enfermedad. El fitoplasma Maize Bushy Stunt (MBS) se identifico por PCR se detectó en plantas con los síntomas antes descritos, en los municipios de Tlalixcoyan, Cosoleacaque y Paso de Ovejas en 2006 y 2007. Los genotipos CP-562, 30F83, 30F92, Orca, 30F96, Nutria y Asgrow 7573 resultaron positivos a la presencia del MBS, mientras que en 3086, 30F97 y CP-560 no se detectó la presencia del MBS en una plantación experimental en plantas sintomáticas en Tlalixcoyan, Ver. en 2006 y 2007....
Palavras-chave: Maize Bushy Stunt; PCR; Incidencia; Resistencia genética; Genoma; Homología; Incidence; Genetic resistance; Genome; Homology; Maestría en Ciencias; Postgrado en Fitosanidad; Fitopatología.
Ano: 2009
URL: http://hdl.handle.net/10521/53

Detección e incidencia del fitoplasma Maize Bushy Stunt y su relación con el rendimiento en maíz en el estado de Veracruz, México
Provedor de dados: Depósito Institucional Abierto de Documentos Digitales del Colegio de Postgraduados (COLPOS DIGITAL )
Autores: Alcántara Mendoza, Susana.
Una nueva enfermedad del maíz apareció en el estado de Veracruz, México durante 2003-2004. Síntomas de amarillamiento, enrojecimiento y posterior quemado de hojas, proliferación de mazorcas, jilotes raquíticos, falta de fecundación y granos vanos fueron parte del síndrome de la enfermedad. El fitoplasma Maize Bushy Stunt (MBS) se identifico por PCR se detectó en plantas con los síntomas antes descritos, en los municipios de Tlalixcoyan, Cosoleacaque y Paso de Ovejas en 2006 y 2007. Los genotipos CP-562, 30F83, 30F92, Orca, 30F96, Nutria y Asgrow 7573 resultaron positivos a la presencia del MBS, mientras que en 3086, 30F97 y CP-560 no se detectó la presencia del MBS en una plantación experimental en plantas sintomáticas en Tlalixcoyan, Ver. en 2006 y 2007....
Palavras-chave: Maize Bushy Stunt; PCR; Incidencia; Resistencia genética; Genoma; Homología; Incidence; Genetic resistance; Genome; Homology; Maestría; Postgrado en Fitosanidad; Fitopatología.
Ano: 2009
URL: http://hdl.handle.net/10521/53

CHEMICAL CONTROL OF ASIAN SOYBEAN RUST AS A FUNCTION OF CULTIVAR, ROW SPACING AND SPRAY BAR SUPPORT SYSTEMS
Provedor de dados: Engenharia Agrícola
Autores: Hoffmann,Laercio L.; Roehrig,Rafael; Boller,Walter; Forcelini,Carlos A.
ABSTRACT Product deposition and foliar surface cover are highly impacting factors on the efficiency of foliar fungicides applied to soybean cultivars, due to their low mobility, with side effects on Asian soybean rust (ASR) control. Spray bar support systems, such as the air curtain (Vortex®) and the use of nozzles along the bar (Dropleg®), stand out as an alternative to obtain a better distribution of fungicide throughout the plant. In this study, two spray bar support systems (Vortex® and Dropleg®) were, therefore, evaluated and compared with the conventional spraying method based on the biological efficacy in ASR control. In order to do this, two harvests, with three spacing between rows and two cultivars were employed. Vortex® and Dropleg® spray bar...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Plant arrangement; Genetic resistance; Phakopsora pachyrhizi.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162019000400504

Effect of polymorphisms in the Slc11a1 coding region on resistance to brucellosis by macrophages in vitro and after challenge in two Bos breeds (Blanco Orejinegro and Zebu)
Provedor de dados: Genetics and Molecular Biology
Autores: Martínez,Rodrigo; Dunner,Susana; Toro,Rubén; Tobón,Jaime; Gallego,Jaime; Cañón,Javier.
The resistance/susceptibility of selected cattle breeds to brucellosis was evaluated in an F1 population generated by crossing animals classified as resistant (R) and susceptible (S) (R x R, R x S, S x R, S x S) based on challenges in vitro and in vivo. The association between single nucleotide polymorphisms identified in the coding region of the Slc11a1 gene and resistance/susceptibility was estimated. The trait resistance or susceptibility to brucellosis, evaluated by a challenge in vitro, showed a high heritable component in terms of additive genetic variance (h² = 0.54 ± 0.11). In addition, there was a significant association (p &lt; 0.05) between the control of bacterial survival and two polymorphisms (a 3'UTR and SNP4 located in exon 10). The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Blanco Orejinegro Creole breed; Brahman breed; Brucella abortus; Genetic resistance; Zebu.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572010000300014

Genetic control of Eucalyptus urophylla and E. grandis resistance to canker caused by Chrysoporthe cubensis
Provedor de dados: Genetics and Molecular Biology
Autores: Guimarães,Lúcio Mauro da Silva; Resende,Marcos Deon Vilela de; Lau,Douglas; Rosse,Leonardo Novaes; Alves,Alexandre Alonso; Alfenas,Acelino Couto.
Chrysophorte cubensis induced canker occurs in nearly all tropical and subtropical regions where eucalypts are planted, causing losses in both wood quality and volume productivity, especially so in the warmer and more humid regions of Brazil. The wide inter and intra-specific genetic variability of resistance to canker among Eucalyptus species facilitates the selection of resistant plants. In this study, we evaluated resistance to this pathogen in five Eucalyptus grandis (G) and 15 E. urophylla (U) trees, as well as in 495 individuals from 27 progenies derived from crosses between the trees. In the field, six-months-old test seedlings were inoculated with C. cubensis. Lesion length in the xylem and bark was measured eight months later. The results...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genetic resistance; Genetic breeding; Eucalypt and interspecific hybrids.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572010000300024

Evaluation of onion genotypes to slippery skin caused by Burkholderia gladioli pv. Alliicola
Provedor de dados: Horticultura Brasileira
Autores: Velez,Leandro S; Silva,Adriano Márcio F; Santos,Carlos AF; Assunção,Emanuel F; Silva,Matheus S; Souza,Elineide B; Gama,Marco Aurélio S.
ABSTRACT Onion’s (Allium cepa) slippery skin caused by Burkholderia gladioli pv. alliicola is one of the bacterial diseases that stand out in producing regions of the Brazilian Northeast. Given the importance and potential threat of this disease, and the absence of resistant varieties, the aim of this study was to evaluate the reaction of onion genotypes to slippery skin and to analyze the tolerance stability of the most promising genotypes to different strains of the bacteria. Nine strains of B. gladioli pv. alliicola were artificially inoculated in onion bulbs cv. Baia Periforme and the three most aggressive strains (CCRMBG39, CCRMBG172 and CCRMBG212) were selected to evaluate the tolerance to the disease. Fifty-eight onion genotypes were challenged with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allium cepa; Genetic resistance; Onion bacterial rot.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362020000400350

Reaction of melon genotypes to Rhizoctonia solani
Provedor de dados: Horticultura Brasileira
Autores: Michereff,Sami J; Andrade,Domingos EGT; Sales Júnior,Rui.
The intensive exploration of melon (Cucumis melo L.) crops in the Brazilian Northeast favors the occurrence of root diseases such as the Rhizoctonia canker, caused by Rhizoctonia solani. Twenty melon genotypes were challenged against the pathogen isolates RS-9 and RS-10 aiming at selecting those potentially useful for breeding programs and/or integrated disease management. Seeds were planted in infested soil (50 mg of colonized rice grains kg-1 of soil). Disease severity was assessed 15 days after inoculation, by means of a disease scale from 0 to 4, used later to cluster genotypes in five classes. None of the genotypes presented immune-like reaction to R. solani, independent of the pathogen isolate. Disease severity ranged from 6.2 to 85.4% and from 7.8...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cucumis melo; Rhizoctonia canker; Genetic resistance.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362008000300022

Resistance sources to root-knot nematodes Meloidogyne javanica, M. incognita and M. enterolobii in sweet potato
Provedor de dados: Horticultura Brasileira
Autores: Carmona,Paula Andrea O; Pinheiro,Jadir B; Amaro,Geovani Bernardo; Silva,Giovani Olegario da; Peixoto,José Ricardo; Cares,Juvenil Enrique.
ABSTRACT One of the main obstacles for food production in many developing countries, as in Brazil, is the damage caused by root-knot nematodes, mainly those belonging to the genus Meloidogyne. This study aimed to assess the resistance levels of 44 sweet potato genotypes to M. javanica, M. incognita race 1 and M. enterolobii. These researches were carried out in 2014, under greenhouse conditions in Brasília-DF, Brazil. A completely randomized design with six replicates of one plant/plot/treatment was used. We determined the gall index (GI) and egg mass index (EMI) in the root system of each plant, the number of eggs and juveniles per gram of root with galls and the nematode reproduction factor. M. javanica was less aggressive and reproduced in only 9.09% of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ipomoea batatas; Plant breeding; Reproduction factor; Genetic resistance.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362020000200126

Reaction of melon genotypes to the gummy stem blight and the downy mildew
Provedor de dados: Horticultura Brasileira
Autores: Santos,Gil R dos; Castro Neto,Manoel D de; Ramos,Leandro N; Café-Filho,Adalberto C; Reis,Ailton; Momenté,Valéria G; Pelúzio,Joenes M; Ignácio,Maíra.
The gummy stem blight (Didymella bryoniae) and the downy mildew (Pseudoperonospora cubensis) are two foremost melon (Cucumis melo) diseases, considering their effects on yield and fruit quality. Despite the importance of such diseases, relatively few studies have been done so far on the identification of resistance sources to D. bryoniae and P. cubensis in Brazil. This work aimed at evaluating the resistance of commercial melon genotypes to the gummy stem blight and the downy mildew. Firstly, the most aggressive and representative D. bryoniae isolate was selected. Subsequently, the resistance of 86 melon genotypes to stem infection was studied upon greenhouse conditions by inoculating with the previously selected isolate. Afterwards, the resistance to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cucumis melo; Didymella bryoniae; Pseudoperonospora cubensis; Genetic resistance.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362009000200007

Selection of tomato breeding lines with resistance to Tomato yellow vein streak virus
Provedor de dados: Horticultura Brasileira
Autores: Santos,Jean CS; Siqueira,Walter J; Melo,Paulo CT; Colariccio,Addolorata; Lourenção,André L; Melo,Arlete MT.
The study aimed to assess the reaction to Tomato yellow vein streak virus (ToYVSV) of determinate-growth tomato breeding lines of the Instituto Agronomico de Campinas (Campinas Agronomic Institute) germplasm collection and to select resistant plants. The experiment was carried out from August 2008 to February 2009 in greenhouse conditions. The geminivirus isolate used was collected in a tomato commercial field, in Sumaré, São Paulo State, Brazil. The experimental design was completely ramdomized blocks, with 25 treatments, four replications, and 30-plant plots. Virus transmission was carried out in cages containing viruliferous whiteflies (Bemisia tabaci B biotype). Plant reaction to the pathogen was evaluated by means of the percentage of symptomless...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solanum lycopersicum; Bemisia tabaci B biotype; Begomovirus; Vegetable breeding; Genetic resistance.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362015000300345

Potential of wild Solanum stramonifolium accesses as rootstock resistant to soilborne pathogens in tomato crops
Provedor de dados: Horticultura Brasileira
Autores: Pereira,Ricardo B; Pinheiro,Jadir B; Torres,Tiago B; Mendonça,José L; Lucas,Gilvaine C; Guimarães,Jorge A.
ABSTRACT Resistant rootstocks is one of the most effective method to control soilborne pathogens in tomato crops. Thus, this study was installed to evaluate the reaction of Solanum stramonifolium accesses to Fusarium oxysporum f. sp. lycopersici (Fol) races 2 and 3 and to Meloidogyne enterolobii (Me). The seedlings were grown in trays and inoculated separately with Fol races 2 and 3 at 50 days after planting by immersing the roots in the spore suspension (1×106 microconidia mL-1). Then, seedlings were transplanted in pots containing sterilized soil and kept in greenhouse conditions. To study the reaction of S. stramonifolium accesses to nematodes, we used 27-day old seedlings that were also planted in pots and inoculated with 6,000 eggs and second-stage...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Meloidogyne enterolobii; Solanum lycopersici; Fusarium wilt; Grafting; Genetic resistance.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362018000200235

Evaluation of tomato rootstocks to Ralstonia solanacearum and R. pseudosolanacearum in Mata mesoregion, PE
Provedor de dados: Horticultura Brasileira
Autores: Albuquerque,Géssyka R; Lucena,Lucas P; Assunção,Emanuel F; Mesquita,Júlio Carlos P; Silva,Adriano Márcio F; Souza,Elineide B; Nicoli,Alessandro; Gama,Marco Aurélio S.
ABSTRACT Bacterial wilt limits tomato production and resistant rootstocks could be important for the integrated management of the disease. Since there is an interaction between local bacterial strains and tomato genotype, this study aimed to evaluate 14 tomato rootstocks to bacterial wilt in the Mata mesoregion of Pernambuco state, Brazil. The rootstocks reaction to two sequevars of Ralstonia solanacearum and two of R. pseudosolanacearum was evaluated in four experiments carried out in the greenhouse using the completely randomized experimental design, with four replications composed of four plants each. Seven genotypes were selected to evaluate the reaction to bacterial wilt as rootstocks grafting in tomato plants ‘Tomini F1’ in a production area with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solanum lycopersicum; Grafting; Genetic resistance; Resistance.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362021000100072

Reaction of faba bean genotypes to Rhizoctonia solani and resistance stability
Provedor de dados: Horticultura Brasileira
Autores: Assunção,Iraildes P; Nascimento,Liliane D; Ferreira,Mércia F; Oliveira,Francisco J; Michereff,Sami J; Lima,Gaus SA.
The production of faba bean (Phaseolus lunatus) is limited due to the occurrence of Rhizoctonia canker, caused by the fungus Rhizoctonia solani. In order to select materials with potential for use in faba beans breeding programs and/or disease integrated management, 72 genotypes were evaluated and also stability of the disease resistance in relation to different pathogen isolates, inoculum densities and soil type. The seeds were sown in soil infested with the pathogen by the addition of colonized substrate (rice grains). The evaluation of genotypes was done after 15 days, using a note scale to discriminate the genotypes into five reaction classes. None of the 72 genotypes showed immunity to R. solani and only four genotypes (F-42, F-49, F-53 and F-58)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus lunatus; Rhizoctonia canker; Genetic resistance.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362011000400008

Reaction of hybrids, inhibition in vitro and target spot control in cucumber
Provedor de dados: Horticultura Brasileira
Autores: Teramoto,Adriana; Martins,Marise C; Ferreira,Luciene C; Cunha,Marcos G.
The fungus Corynespora cassiicola is the causal agent of target spot in cucumber. Under favorable climatic conditions it can cause serious damage in this horticultural crop. In Brazil, there exists not enough knowledge to determine efficient control measures to the disease. This investigation was carried out to evaluate: a) the reactions of nine cucumber hybrids to C. cassiicola; b) the sensibility of six isolates of C. cassiicola to fungicides in vitro (captan, chlorothalonil, mancozeb, azoxystrobin, difenoconazole, carbendazin, tebuconazole and thiophanate-methyl), used in concentrations of 0, 1, 10, 100 and 1,000 µg mL-1 of active ingredient and c) protective and curative chemical treatments with the same fungicides used in vitro in cucumber plants...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cucumis sativus; Corynespora cassiicola; Sensitivity to fungicides; Genetic resistance.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362011000300014

Interação molecular planta-nematóide.
Provedor de dados: Informação Tecnológica em Agricultura (Infoteca-e)
Autores: FRAGOSO, R. da R.; LOURENÇO, I. T.; VIANA, A. A. B.; SOUZA, D. dos S. de L.; ANDRADE, R. V. de; MEHTA, A.; BRASILEIRO, A. C. M.; PINTO, E. R. de C.; LIMA, L. M. de; ROCHA, T L.; SA, M. F. G. de.
ABSTRACT: The endoparasitic sedentary phytonematodes of genera Heterodera, Globodera (known as cyst nematodes, CN) and Meloidogyne (the root-knot nematodes, RKN) are major crop phytopathogens, causing estimated losses of US$ 125 billion annually in the world. These plant-parasitic nematodes share some parasitism mechanisms, which ensure host-tissue invasion and host-defense evasion. The establishment and maintenance of the sophisticated molecular plant-nematode interaction are based upon several secreted molecules that access plant cellular processes, transforming them in enlarged, multinucleate, and metabolically active feeding cells. Nematicides applications are usually expensive, inefficient and environmentally hazardous. Crop rotation, bio-control...
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Controle; Pests of plants.; Genética Vegetal; Nematóide; Praga de Planta; Resistência Genética.; Nematoda; Genetics.; Genetic resistance.
Ano: 2007
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/571936

Tipos de lesiones de Piricularia en trigo.
Provedor de dados: Informação Tecnológica em Agricultura (Infoteca-e)
Autores: TORRES, G. A. M.; SOTO GONZÁLES, H. H.; WEBBER, N. F.; SCHERER, H. M.
bitstream/item/144811/1/ID43672-2016CTO355.pdf
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: Fenotipagem; Disease; Wheat blast; Phenotyping; Enfermedad; Bruzone; Caracterización.; Brusone; Doença; Resistência Genética; Pyricularia Oryzae; Trigo.; Magnaporthe oryzae; Genetic resistance; Wheat.
Ano: 2016
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1047603

Alternativas para o controle da Antracnose do açaí-solteiro.
Provedor de dados: Informação Tecnológica em Agricultura (Infoteca-e)
Autores: NOGUEIRA, S. R.; ANDRADE NETO, R. de C.; LUNZ, A. M. P.; COSTA, K. K. da.
A antracnose, causada por Colletotrichum gloesporioides, induz severos danos às folhas de açaizeiro (Euterpe precatoria), levando à morte de plantas, principalmente nas condições de viveiro. A doença é limitante para a produção de mudas de açaí-solteiro e consequentemente para expansão do seu cultivo. Os estudos com essa espécie ainda estão no início, sendo necessária a adoção de um conjunto de medidas para o controle eficiente da antracnose.
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E)
Palavras-chave: Açaí solteiro; Cultivos de viveros; Enfermedades y desórdenes de las plantas; Enfermedades fungales de las plantas; Antracnosis; Control biológico; Control químico; Control cultural; Açaí; Viveiro; Doença de Planta; Doença Fúngica; Antracnose; Colletotrichum Gloeosporioides; Controle Biológico; Controle Químico; Controle Genético; Controle Cultural; Euterpe precatoria; Nursery crops; Plant diseases and disorders; Fungal diseases of plants; Anthracnose; Glomerella cingulata f. sp. aeschynomene; Biological control; Chemical control; Cultural control; Genetic resistance.
Ano: 2018
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1091660

Virulência de isolados de Puccinia coronata f. sp. avenae do Rio Grande do Sul.
Provedor de dados: Informação Tecnológica em Agricultura (Infoteca-e)
Autores: VIEIRA, E. A.; CARVALHO, F. I. F. de; CHAVES, M. S.; FIALHO, J. de F.
RESUMO: Não existem estudos conclusivos sobre a variabilidade em virulência de isolados de Puccinia coronata f. sp. avenae que ocorrem no Rio Grande do Sul. O principal objetivo do trabalho foi determinar o padrão de virulência/avirulência e a raça fisiológica de 46 isolados de Puccinia coronata f. sp. avenae coletados em três municípios do Estado do Rio Grande do Sul com base na reação em 25 linhas quase isogênicas portadoras de genes Pcs, utilizando o sistema norte-americano de nomenclatura e um novo sistema sugerido neste trabalho. Os isolados passaram por dois isolamentos monopustulares e posteriormente foram inoculados sobre plântulas portadoras dos genes Pcs sendo que a avaliação foi efetuada 15 dias depois da inoculação. Os resultados evidenciaram...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Plant diseases; Rusts.; Aveia; Avena Sativa; Doença de Planta; Ferrugem; Fungo; Resistência Genética.; Puccinia coronata; Fungi; Genetic resistance; Oats.
Ano: 2005
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/569836

Coleção de Microrganismos Patogênicos a Caprinos e Ovinos - CMPCO.
Provedor de dados: Informação Tecnológica em Agricultura (Infoteca-e)
Autores: FACCIOLI-MARTINS, P. Y.; SOUZA, V. de; PINHEIRO, R. R.
Resumo: Esta publicação tem por objetivo descrever a história, a composição da Coleção de trabalho de Microrganismos Patogênicos a Caprinos e Ovinos, e de que forma ela tem conservado, caracterizado, documentado e utilizado seus isolados. A coleção foi criada em 2012 e atualmente é composta por 141 cepas bacterianas e seis cepas virais, pertencentes às espécies Corynebacterium pseudotuberculosis, Staphylococcus aureus e ao gênero Lentivirus. Esses isolados são utilizados para produção de antígenos para imunodiagnósticos, em diagnósticos moleculares e na avaliação de resistência a antimicrobianos e ação de anti-sépticos e antimicrobianos. Participa de projetos das coleções institucionais e de gestão da qualidade. [Collection of Goat and Sheep Pathogenic...
Tipo: Artigo de divulgação na mídia (INFOTECA-E)
Palavras-chave: Caracterização; Germplasm bank; Characterization; Diagnosis; Quality; Pathogenic Microorganisms; Caprino; Ovino; Banco de Germoplasma; Conservação; Resistência Genética; Diagnostico; Qualidade; Sheep diseases; Goat diseases; Germplasm conservation; Conservation banks; Genetic resistance; Small ruminants; Brazil.
Ano: 2020
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1123793

Variáveis epidemiológicas associadas à mancha-branca-do-milho.
Provedor de dados: Informação Tecnológica em Agricultura (Infoteca-e)
Autores: COSTA, R. V. da; COTA, L. V.; SILVA, D. D. da; FIGUEIREDO, J. E. F.; MEIRELLES, W. F.; CASELA, C. R.; LANZA, F. E.; ZAMBOLIM, L.; PACCOLA MEIRELLES, L. D.
Mancha-branca-do-milho (MBM), anteriormente conhecida por mancha-de-feosféria (MF), tornou-se uma das doenças mais importantes do Brasil. A incidência e a gravidade da doença MBM têm aumentado significativamente desde os anos 90 e ela pode ser encontrada em quase todas as áreas de cultivo de milho. Neste estudo, as variáveis epidemiológicas associadas com a resistência à doença MBM foram avaliadas com oito híbridos simples, um híbrido duplo, um híbrido triplo e cinco linhagens. As avaliações foram feitas em dois ensaios, usando-se delineamento em blocos casualizados com três repetições, em duas épocas de plantio. A área abaixo da curva de progresso da doença (AACPD) e severidade da doença no final da epidemia (Ymax) foram as variáveis epidemiológicas que...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Doença de planta; Zea mays; Resistência genética; Pantoea ananatis; Genetic resistance; Plant diseases and disorders.
Ano: 2013
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/981029

Desempenho de cultivares e linhagens de algodoeiro Herbáceo sob pressão de doenças e nematoides: resultados de 2012/13.
Provedor de dados: Informação Tecnológica em Agricultura (Infoteca-e)
Autores: CIA, E.; FARIAS, F. J. C.
O crescimento da cotonicultura brasileira em novas regiões, além da adoção de novos sistemas de produção, propiciou o surgimento de novas doenças, juntamente com o agravamento de outras, que levaram os produtores a buscar alternativas para manter o setor competitivo. Isso aumentou a demanda por cultivares com características de resistência a doenças abaixo dos níveis desejáveis, ocasionando um significativo aumento no custo de produção. A escolha de uma cultivar adequada é a base para garantir o máximo benefício pelo emprego dos demais fatores de produção e, consequentemente, para aumentar as chances de sucesso na rentabilidade na cultura do algodoeiro. Os programas de melhoramento genético desta cultura que atuam no Brasil têm disponibilizado ao mercado...
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Algodão herbáceo; Melhoramento genético vegetal; Controle genético; Nematoide; Doença de planta; Plant diseases and disorders; Plant breeding; Genetic resistance.
Ano: 2016
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1066737

Different survival of three populations of European sea bass (Dicentrarchus labrax) following challenge with two variants of nervous necrosis virus (NNV)
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Barsøe, Sofie; Allal, Francois; Vergnet, Alain; Vandeputte, Marc; Olesen, Niels Jørgen; Schmidt, Jacob Günther; Larsen, Cathrine Agnete; Cuenca, Argelia; Vendramin, Niccolò.
Viral Nervous Necrosis (VNN, also called viral encephalo- and retinopathy (VER)), is a widespread disease of marine aquaculture caused by betanodavirus (or nervous necrosis virus - NNV), a segmented positive sense RNA virus, member of the nodaviridae family. VNN affects predominantly marine fish and cause significant losses to the Mediterranean fish farming industry, including the production of European sea bass (Dicentrarchus labrax). Of the four circulating genotypes of betanodavirus, red-spotted grouper NNV (RGNNV) and the reassortant genotype red-spotted grouper/striped jack NNV (RG/SJNNV) are most prevalent in the Mediterranean. Inheritable resistance against VNN has been detected in sea bass, and selective breeding could be a mean to limit this...
Tipo: Text
Palavras-chave: Nervous necrosis virus; Betanodavirus; Viral enchephalo-and retinopathy; Genetic resistance; Host-pathogen interaction; Sea bass; Neurological infection.
Ano: 2021
URL: https://archimer.ifremer.fr/doc/00678/79050/81498.pdf

Characterization of grain mold resistant sorghum germplasm accessions for physio-morphological traits
Provedor de dados: Open Acess Agriculture Research Repository
Autores: Thakur, R.P.
Palavras-chave: Grain; Germplasm; Fungi; Sorghum; Agronomic characters; Hybrids; Breeds (animals); Organic acids; Genetic resistance; Cereals.
Ano: 2008
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3143

Incidence of corn stunt disease in off-season corn hybrids in different sowing seasons
Provedor de dados: Pesquisa Agropecuária Brasileira
Autores: Costa,Rodrigo Véras da; Silva,Dagma Dionísia da; Cota,Luciano Viana; Campos,Leonardo José Motta; Almeida,Rodrigo Estavam Munhoz de; Bernardes,Fernanda Pinheiro.
Abstract: The objective of this work was to evaluate the incidence of corn stunt disease and its effects on the grain yield of off-season corn (Zea mays) hybrids in different sowing seasons. The experiment was conducted in three sites in the state of Tocantins, in different sowing seasons, in a randomized complete block design, with 30 hybrids (treatments) and three replicates. Corn stunt disease incidence was assessed at 80 days after emergence, varying between hybrids and sowing seasons, with a marked effect of sowing season. The most resistant hybrids were: MG652 PW, Penta VIP, MG600 PW, NS90 PRO2, LG3040 VIP3, MG580 PW, and Defender VIP. The Fórmula VIP2 hybrid was the most susceptible to corn stunt disease. The incidence of the disease increased in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dalbulus maidis; Zea mays; Genetic resistance; Mollicutes; Phytoplasma; Spiroplasma.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2019000102303

Inheritance of resistance to cotton blue disease
Provedor de dados: Pesquisa Agropecuária Brasileira
Autores: Pupim Junior,Osmério; Schuster,Ivan; Pinto,Ronald Barth; Pires,Ely; Belot,Jean-Louis; Silvie,Pierre; Chitarra,Luiz Gonzaga; Hoffmann,Lúcia Vieira; Barroso,Paulo.
The objective of this work was to determine the inheritance of cotton blue disease resistance by cotton plants. Populations derived from the CD 401 and Delta Opal resistant varieties were evaluated, through a greenhouse test with artificial inoculation by viruliferous aphids. Cotton blue disease resistance is conditioned by one dominant gene, both in CD 401 and Delta Opal varieties.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gossypium hirsutum; Aphis gossypii; Genetic resistance; Luteoviruses.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2008000500015

Asian soybean rust in Brazil: past, present, and future
Provedor de dados: Pesquisa Agropecuária Brasileira
Autores: Godoy,Cláudia Vieira; Seixas,Claudine Dinali Santos; Soares,Rafael Moreira; Marcelino-Guimarães,Franscismar Correa; Meyer,Maurício Conrado; Costamilan,Leila Maria.
Abstract: Asian soybean rust, caused by the fungus Phakopsora pachyrhizi, is the most severe disease of the crop and can cause yield losses of up to 90%. The disease was first reported in Brazil in 2001. Epidemics of the disease are common in the country, where the fungus can survive year-round. Regulatory measures to reduce the inoculum between seasons and avoid late-season soybean have been adopted to manage the disease. Disease control has relied mainly on chemical control, but a lower sensibility of the fungus to fungicides has been reported in Brazil. Major-resistance genes have been mapped and incorporated into the cultivars. With the reduced efficacy of the fungicides, the adoption of integrated measures to control the disease will be important for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Phakopsora pachyrhizi; Biotechnology; Chemical control; Genetic resistance; Losses; Management.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2016000500407

Parent selection for cocoa resistance to witches'-broom
Provedor de dados: Pesquisa Agropecuária Brasileira
Autores: Silva,Stela Dalva Vieira Midlej; Luz,Edna Dora Martins Newman; Pires,José Luis; Yamada,Milton Macoto; Santos Filho,Lindolfo Pereira dos.
The objective of this work was to identify genotypes with high general combining ability for resistance to witches'-broom (Moniliophthora perniciosa) in populations formed from a first cycle of recurrent selection. Highly productive and resistant clones from different origins were interbred using the North Carolina II design. The clones SCA 6, CSUL 7, RB 39, CEPEC 89, OC 67, BE 4, EEG 29 and ICS 98 were used as paternal parents, while the maternal ones were NA 33, CCN 10, IMC 67, P 4B, CCN 51, CEPEC 86, SGU 54 and ICS 9. Twenty days after germination, 56 seedlings of each cross (four replicates of 14 seedlings) received the inoculation of a 1-mL suspension with 7.5x10(4 ) basidiospores mL-1. Symptoms were evaluated 60 days after inoculation. Significant...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Moniliophthora perniciosa; Theobroma cacao; Disease integrate management; Early selection; Genetic resistance.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2010000700007

Screening of papaya accessions resistant to Papaya lethal yellowing virus and capacity of Tetranychus urticae to transmit the virus
Provedor de dados: Pesquisa Agropecuária Brasileira
Autores: Basso,Marcos Fernando; Pereira,Álvaro Júlio; Pereira,Hermano Monteiro de Barros; Ramos,Humberto Josué de Oliveira; Dantas,Jorge Luiz Loyola; Fontes,Elizabeth Pacheco Batista; Andrade,Eduardo Chumbinho de; Zerbini,Francisco Murilo.
The objective of this work was to produce a polyclonal antiserum against the coat protein (CP) of Papaya lethal yellowing virus (PLYV) and to determine its specificity and sensibility in the diagnosis of the virus, as well as to evaluate the genetic resistance to PLYV in papaya (Carica papaya) accessions and to investigate the capacity of the two-spotted spider mite Tetranychus urticae to acquire and transmit PLYV to the plants. Sixty-five papaya accessions were evaluated. For each accession, ten plants were mechanically inoculated using PLYV-infected plant extracts, and three plants were mock inoculated with phosphate buffer alone and used as negative controls. Ninety days after inoculation, newly-emerging systemic leaves were collected from the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carica papaya; Elisa; Genetic resistance; Plant breeding; PLYV; Two-spotted spider mite.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2015000200097

Diallel analysis for frogeye leaf spot resistance in soybean
Provedor de dados: Pesquisa Agropecuária Brasileira
Autores: Gravina,Geraldo de Amaral; Sediyama,Carlos Sigueyuki; Martins Filho,Sebastião; Moreira,Maurílio Alves; Barros,Everaldo Gonçalves de.
Seven soybean cultivars (Bossier, Cristalina, Davis, Kent, Lincoln, Paraná and Uberaba), with different levels of resistance to Cercospora sojina, were crossed in a diallel design to determine the general (GCA) and specific (SCA) combining abilities relative to the inheritance of the resistance. Race 04 of the fungus was inoculated in the parents and in the 21 F1 hybrids in a greenhouse in a completely randomized design, with 12 replications. The reactions to the disease were evaluated 20 days after the inoculation, always on the most infected leaflet. Both GCA and SCA were significant for all the evaluated characters, being inferred that, for the expression of the characters, the additive, dominant and, possibly, epistatic genic actions were important....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Cercospora sojina; Combining ability; Heterosis; Genetic resistance; Genetic parameters.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2003000600002

SOURCES OF RESISTANCE TO Fusarium oxysporum f. sp.cubense IN BANANA GERMPLASM
Provedor de dados: Revista Brasileira de Fruticultura
Autores: Ribeiro,Lindinéia Rios; Silva,Sebastião de Oliveira e; Oliveira,Saulo Alves Santos de; Amorim,Edson Perito; Serejo,Janay Almeida Santos; Haddad,Fernando.
ABSTRACT  Fusarium wilt (syn= Panama disease), caused by Fusarium oxysporum f. sp. cubense (FOC), is one of the most destructive diseases of banana, being genetic resistance the main management strategy for this disease. Since the pathogen is constantly evolving to supplant the genetic resistance, new sources of resistance must be investigated by genetic improvement programs aiming to developing new varieties. The objective of the present study was to identify sources of resistance from the different accessions maintained in the banana active germplasm bank (BAGB) at Embrapa Mandioca e Fruticultura. Forty-one BAGB accessions were evaluated, including 17 diploids, 21 triploids, and two tetraploids. The area under the disease progress curve, disease index,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Musa spp.; Panama disease; Varieties; Genetic resistance.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452018000100401

Method for evaluating rhizoctonia resistance in melon germplasm
Provedor de dados: Revista Ciência Agronômica (RCA)
Autores: Silva,Gefferson Thiago Mota de Almeida; Oliveira,Frederico Inácio Costa de; Carvalho,Alexya Vitoria Felix; André,Thais Paz Pinheiro; Silva,Christiana de Fátima Bruce da; Aragão,Fernando Antonio Souza de.
ABSTRACT The intensive cultivation of melon, mainly in the Northeast of Brazil, has favored the occurrence of root diseases such as rhizoctonia, caused by the fungus Rhizoctonia solani Kuhn. The use of resistant cultivars is one of the most efficient strategic measures for integrated management of diseases in this crop. It is necessary to use an efficient inoculation method to evaluate rhizoctonia in melon germplasm with the aim of identifying sources of resistance. The objective of this study was to develop an efficient method to inoculate the pathogen to proceed in selection of R. solani resistant melon germplasm. Five experiments were conducted under greenhouse conditions to define the adequate container, growth environment, substrate for inoculum...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cucumis melo; Rhizoctonia solani; Genetic resistance; Damping off.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902020000400416

Hot pepper (Capsicum chinense, Jacq.) inheritance of reaction to powdery mildew
Provedor de dados: Scientia Agricola
Autores: Blat,Sally Ferreira; Costa,Cyro Paulino da; Vencovsky,Roland; Sala,Fernando Cesar.
The pepper species C. chinense has been considered one of the most important resistance sources to powdery mildew Capsicum spp. However, the inheritance in this species was unknown. The purpose of this work was to study its reaction inheritance. Two powdery mildew resistant parents, 'Pimenta Cheiro' 1 and PI 152225 and two moderately susceptible ones, 'Pimenta Doce' IH-1761 and 'Pimenta Índio', were used to obtain three F1 and their respective F2 generations: 'Pimenta Doce' IH-1761 &lt;FONT FACE=Symbol&gt;´&lt;/FONT&gt; 'Pimenta Cheiro' 1, 'Pimenta Índio' &lt;FONT FACE=Symbol&gt;´&lt;/FONT&gt; PI 152225 and 'Pimenta Doce' IH-1761 &lt;FONT FACE=Symbol&gt;´&lt;/FONT&gt; PI 152225. The powdery mildew epidemy was natural using inoculum from a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Leveillula taurica (LEV.) Arn.; Capsicum chinense; Genetic resistance; Gene action.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000500008

Increasing the resistance of common bean to white mold through recurrent selection
Provedor de dados: Scientia Agricola
Autores: Leite,Monik Evelin; Dias,Juliana Andrade; Souza,Danuza Araujo de; Alves,Filipe Couto; Pinheiro,Lucas Rezende; Santos,João Bosco dos.
ABSTRACT White mold, caused by Sclerotinea sclerotiorum (Lib.) de Bary is one of the most important diseases of the common bean (Phaseolus vulgaris L.) worldwide. Physiological resistance and traits related to disease avoidance such as architecture contribute to field resistance. The aim of this study was to verify the efficiency of recurrent selection in physiological resistance to white mold, “Carioca” grain type and upright habit in common bean. Thirteen common bean lines with partial resistance to white mold were intercrossed by means of a circulant diallel table, and seven recurrent selection cycles were obtained. Of these cycles, progenies of the S0:1, S0:2 and S0:3 generations of cycles III, IV, V and VI were evaluated. The best (8 to 10) progenies...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sclerotinia sclerotiorum; Phaseolus vulgaris; Genetic resistance; Genetic progress.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000100071

Inheritance of reaction to Leveillula taurica (Lev.) Arn. in Capsicum annuum L.
Provedor de dados: Scientia Agricola
Autores: Blat,Sally Ferreira; Costa,Cyro Paulino da; Vencovsky,Roland; Sala,Fernando Cesar.
The use of fungicides to control powdery mildew in sweet pepper has been ineffective and genetic resistance is the best alternative. Resistance sources identified in Capsicum annuum L. are rare and unsatisfactory. The purpose of this work was to study the inheritance of C. annuum reaction to powdery mildew. Three homozygous powdery mildew resistant parents, HV-12, Chilli and #124 and three susceptible lines, 609, 442 and 428 were used to obtain seven F1's and respectively their generations F2: HV-12 x 609, 442 × HV-12, 428 × HV-12, Chilli × 609, #124 × 609, Chilli × HV-12 and #124 × HV-12. The powdery epidemic was natural using inoculum from highly sporulating susceptible pepper host. Powdery mildew host reaction evaluations were carried out during the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sweet pepper; Powdery mildew; Genetic resistance; Gene action; Allelism.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000100008

Diallel crossing among maize populations for resistance to fall armyworm
Provedor de dados: Scientia Agricola
Autores: Alvarez,María del Pilar; Miranda Filho,José Branco de.
Among the insects infecting the maize (Zea mays L.) crop in Brazil, the fall armyworm (Spodoptera frugiperda Smith, 1797, Lepdoptera: Noctuidae) is considered one of the most important because it causes the highest damage to yield. Genetic resistance to the fall armyworm has be an effective control strategy. The main objective of this work was to evaluate new germplasm sources for resistance to the fall armyworm, the key pest for the maize crop in Brazil. A partial diallel design between 20 varieties of Brazilian germplasm and nine exotic and semi-exotic varieties of different origin was used. The 180 crosses and 29 parental varieties along with two commercial checks were evaluated in three locations in the State of São Paulo State (Brasil). Fall armyworm...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genetic resistance; Partial diallel; Germplasm.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000400017

Diallel analysis of maize resistance to Phaeosphaeria maydis
Provedor de dados: Scientia Agricola
Autores: Silva,Herberte Pereira da; Moro,José Roberto.
In breeding programs directed towards genetic resistance against diseases, the estimation of genetic parameters that control resistance allows the introduction of resistance into suscetible germplasm to be clearly focused. The purposes of this study were to estimate heterosis effects, and the general (GCA) and specific (SCA) combining abilities by using two rating methods for resistance to Phaeosphaeria maydis in a diallel analysis of 36 F1 maize hybrids and their nine inbred lines. Trials were conducted in three environments. Disease severity was evaluated in the whole plant (PI) and in the leaf positioned just below the point of insertion of the main ear (AFA). The trials followed a randomized block design with plots represented by a 5 m long rows....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays L.; Genetic resistance; Heterotic effects; General and specific combining ability.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000100007

Phenotyping for angular leaf spot severity and its implication in breeding common bean for resistance
Provedor de dados: Scientia Agricola
Autores: Pereira,Rafael; Abreu,Ângela de Fátima Barbosa; Nalin,Rafael Storto; Souza,Elaine Aparecida de.
ABSTRACT: Phenotyping for severity of angular leaf spot (ALS) in common bean is important to identify new sources of resistance and select progenies in conventional and molecular marker-assisted breeding. In this study, three phenotyping methods for ALS severity were assessed and its implications in breeding for resistance to Pseudocercospora griseola are discussed. Reaction of 144 common bean lines to P. griseola was evaluated. Three different experiments were conducted in the greenhouse (V2 and V3 stages) and in the field. Common bean lines were inoculated with a mixture of spores of pathogen races 63-63 and 63-23. We observed that 31 %, 7 % and 10 % of lines were resistant in stages V2, V3 and in the field, respectively. Estimates of coincidence index...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris L.; Pseudocercospora griseola; Genetic resistance; Artificial inoculation.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001500415

Reaction of detached fruíts from selected cocoa clones to artificial inoculation with Phytophthora palmivora
Provedor de dados: Acta Agronómica
Autores: Rodríguez Polanco,Leonora; Carrero Gutiérrez,Martha Liliana; Bayardo Parra,Edinson; Segura Amaya,Jose Dimas.
Abstract Black pod rot (BPR), caused by several species of the genus Phytophthora, is one of the most limiting diseases for the production of cocoa as it appears in all of the producing regions of the world and generates significant losses. The aim of this study was to establish the response to this infection in six cacao clones (EET8, IMC67, TSH565, PA46, ICS95, and CCN51), through an inoculation test on detached fruits using five P. palmivora isolates from five producing regions. The incidence and severity of the disease in the detached pods were evaluated at six and ten days after inoculation (DAI). Clone CCN51 was classified as susceptible, and clones IMC67 and PA46 as moderately susceptible at six DAI. All the clones evaluated were categorized as...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Black pod rot; Theobroma cacao; Genetic resistance.
Ano: 2022
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122022000200186

Selection of interspecific Psidium spp. hybrids resistant to Meloidogyne enterolobii
Provedor de dados: Acta Scientiarum: Agronomy
Autores: Ribeiro, Rodrigo Moreira; Martins Gomes, Vicente; Pio Viana, Alexandre; Moreira Souza, Ricardo; Santos, Paulo Ricardo dos.
Since 2001, the disease known as 'guava decline', resulting from the interaction between the phytonematode Meloidogyne enterolobii and the fungus Fusarium solanie, has caused direct and indirect economic losses to the entire guava production chain. Given the lack of sources of resistance in guava genotypes, interspecific hybrids of Psidium spp. were obtained for resistance to the nematode M. enterolobii. To classify the level of resistance of the interspecific hybrids, we evaluated the plant classification methodologies proposed by Oostenbrink (1966) and Moura and Régis (1987). Estimates of genetic parameters were obtained using the REML/BLUP approach. Interspecific hybrids resistant to M. enterolobii were selected that can be used as rootstocks or in new...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mixed models; Genotypic values; Genetic resistance; Psidium guajava.
Ano: 2019
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/42702

Phytophthora infestans (Mont.) de Bary. I. Host-Pathogen specificity and resistance components
Provedor de dados: Agrociencia
Autores: Lozoya-Saldaña,Héctor; Guzmán-Galindo,Leonel; Fernández-Pavia,Sylvia; Grünwald,Niklaus J.; McElhinny,Elaine.
Abstract The molecular identity of Phytophthora infestans strains infecting potatoes in the Toluca Valley has been documented. Nevertheless, the relationship of the P. infestans genotypes to the host’s genetic resistance is unclear. In order to identify potential host-pathogen specificity, isolates of the oomycete obtained from five potato varieties with differing levels of disease resistance were compared regarding mating type (MT), isozyme genotype for glucose-6-phosphate isomerase (Gpi) and peptidase (Pep), and sensitivity to metalaxyl. Also, host resistance components and specificity on the host-pathogen interaction were assessed twice in detached leaves in the laboratory and once in attached leaves in the greenhouse for three of the varieties. No...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Compatibility; Isozymes; Metalaxyl resistance; Genetic resistance; Host-pathogen specificity.
Ano: 2006
URL: http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S1405-31952006000200205

Potential of popcorn germplasm as a source of resistance to ear rot
Provedor de dados: Bragantia
Autores: Kurosawa,Railan do Nascimento Ferreira; Amaral Junior,Antonio Teixeira do; Vivas,Janieli Maganha Silva; Guimarães,Amanda Gonçalves; Miranda,Samila Barbosa; Dias,Vicente Mussi; Scapim,Carlos Alberto.
ABSTRACT Because of its multi-purpose nature, popcorn has sparked the interest of the World Trade Organization as regards fungal contamination by mycotoxins. However, no investigations have been conducted on popcorn for resistance of genotypes to ear rot. The aim of this study was to evaluate the potential of popcorn genotypes as to resistance to ear rot and rotten kernels, as an initial step for the implementation of a breeding program with the popcorn crop in Northern Rio de Janeiro State, Brazil. Thirty-seven accessions from different ecogeographic regions of Latin America were evaluated in 2 cultivation periods, in a randomized block design with 4 replications. We evaluated the incidence of rotten ears, incidence of rotten ears caused by Fusarium spp.,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Fusarium spp.; Genetic resistance.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052017000300378

Popcorn germplasm resistance to fungal diseases caused by Exserohilum turcicum and Bipolaris maydis
Provedor de dados: Bragantia
Autores: Kurosawa,Railan do Nascimento Ferreira; Vivas,Marcelo; Amaral,Antonio Teixeira do; Ribeiro,Rodrigo Moreira; Miranda,Samila Barbosa; Pena,Guilherme Ferreira; Leite,Jhean Torres; Mora,Freddy.
ABSTRACT Compared with the common corn, popcorn shows greater susceptibility to pests and diseases occurrence, being the use of resistant cultivars the most efficient strategy. In this regard, Germplasm Banks deserve special attention because they contain accessions that can be used as sources of resistance in breeding programs. The State University of Northern Rio de Janeiro (UENF) maintains a popcorn Germplasm Bank with accessions from tropical and temperate countries, including Diversity Centers for the species. In this study, we investigated the performance of 37 popcorn accessions landraces, hybrids, and inbreed lines ― from the Germplasm Collection of UENF’s Popcorn Breeding Program with respect to the fungal leaf diseases northern leaf blight (NLB)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Northern leaf blight; Genetic resistance; Plant breeding.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052018000100036

Cytokines produced by susceptible and resistant mice in the course of Paracoccidioides brasiliensis infection
Provedor de dados: Brazilian Journal of Medical and Biological Research
Autores: Calich,V.L.G.; Kashino,S.S.
Paracoccidioidomycosis (PCM) is the most prevalent deep mycosis in Latin America and presents a wide spectrum of clinical manifestations. We established a genetically controlled murine model of PCM, where A/Sn mice develop an infection which mimics the benign disease (immune responses which favor cellular immunity) and B10.A animals present the progressive disseminated form of PCM (preferential activation of B cells and impairment of cellular immune responses). To understand the immunoregulatory phenomena associated with resistance and susceptibility in experimental PCM, A/Sn and B10.A mice were studied regarding antigen-elicited secretion of monokines (TNF-&lt;FONT FACE="Symbol"&gt;a&lt;/font&gt; and TGF-ß) and type-1 (IL-2 and IFN-&lt;FONT...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Murine paracoccidioidomycosis; Genetic resistance; Cytokines; Type-1 cytokines; Type-2 cytokines; Monokines.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1998000500003

Resistance of potato clones to necrotic recombinant strains of potato virus y (pvy)
Provedor de dados: Ciência e Agrotecnologia
Autores: Ribeiro,Silvia Regina Rodrigues de Paula; Pinto,César Augusto Brasil Pereira; Costa,Suellen Bárbara Ferreira Galvino; Menezes,Mariney de; Figueira,Antonia dos Reis.
The Ry adg allele is widely used by breeders to confer extreme resistance to all strains of PVY. However, the necrotic strain has increased recombination resulting in recent considerable losses in productivity. Thus far, not all necrotic recombinant strains of PVY have been tested for their reaction to the Ry gene. The objective of this study was to identify potato clones carrying the resistant allele and to assess their reaction to the following recombinant strains: NTN (PVY NTN), Wilga (PVY N-Wi), and "curly top" (PVY E). Advanced clones from the potato breeding program at Universidade Federal de Lavras were evaluated through a specific molecular marker for the Ry adg allele. The clones carrying the resistance allele were grafted on tobacco plants...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solanum tuberosum; Viruses; Breeding; Genetic resistance.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542014000400004