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| Registros recuperados: 277 | |
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| SILVA,M.M.; SANTOS,J.B.; FERREIRA,E.A.; BRITO,O.G.; DONATO,L.M.S.; SANTOS,M.V.. |
| ABSTRACT The use of indicator plants can be an effective alternative in monitoring the presence of toxic molecules in the air, such as herbicides. Thus, in the goal of this study is to assess the sensitivity of forage plants and weeds to atmospheric residual concentrations of clomazone. The treatments were arranged in a 6x5 factorial scheme, with the first factor corresponding to the plant species triticale (Triticosecale rimpaui), maize (Zea mays), sorghum (Sorghum bicolor), palisade grass (Urochloa brizantha), purslane (Portulaca oleracea) and signal grass (Urochloa decumbens), and the second factor to doses of 0, 90, 180, 270 and 360 g ha-1 clomazone doses (equivalent to atmospheric concentrations of 0.0, 0.05, 0.10, 0.15 and 0, 20 mg L-1). Twelve days... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Triticosecale rimpaui Wittm.; Zea mays L.; Sorghum bicolor L.; Urochloa brizantha A. Rich; Portulaca oleracea L.; Urochloa decumbens Stapf.. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582017000100257 |
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| Machado,Eduardo Caruso; Silveira,Joaquim Albenísio Gomes da; Vitorello,Victor Alexandre; Rodrigues,Jorge Luiz Mazza. |
| Foram avaliados, em dois híbridos simples de milho (Zea mays L.), Pioneer 3072 e IAC 701 x B, submetidos à deficiência hídrica, o comportamento da fotossíntese, da remobilização de N e de açúcares durante o período de crescimento dos grãos. As plantas foram cultivadas sob condições naturais, em doze tanques de alvenaria (4 m de comprimento x 0,5 m de largura x 0,6 m de profundidade) contendo terra. A deficiência hídrica foi induzida entre o 5.º e o 15.º dia após a floração, suspendendo-se a irrigação. Sem deficiência hídrica, ambos os híbridos apresentaram comportamento semelhante quanto aos parâmetros avaliados. Sob deficiência hídrica, a remobilização de açúcares e de N, a partir dos órgãos vegetativos para os grãos, foi mais intensa que nas... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Milho; Zea mays L.; Deficiência hídrica; Trocas gasosas; Crescimento; Açúcares; Nitrogênio. |
| Ano: 1992 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87051992000200004 |
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| Silva,Francisca Gleiciane da; Assis Junior,Raimundo Nonato de; Mesquita,Rosilene Oliveira; Marques,Edilaine da Silva; Mota,Jaedson Cláudio Anunciato. |
| ABSTRACT Based on the hypothesis that less than 10% aeration porosity is sufficient to ensure plant development, the objective of this study was to evaluate the effect of levels of aeration porosity and soil density on the gas exchange and growth of maize plants. The experiment was conducted in a greenhouse, in randomized blocks in a 2 × 5 factorial arrangement: two densities (1.6 and 1.7 Mg m-3) and five aeration porosities (0.07, 0.08, 0.09, 0.10 and 0.12 m3 m-3), with five replicates. The interaction between the factors did not have an effect on the analyzed variables. Aeration porosity had a significant effect on photosynthesis, stomatal conductance, relative chlorophyll index (SPAD), plant height and biomass production, whose data were fitted by... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil aeration; Physical quality; Ecophysiology; Zea mays L.. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902020000300403 |
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| Sanches,Rafael Egea; Scapim,Carlos Alberto; Tessmann,Dauri José; Vieira,Rafael Augusto; Rodovalho,Marcos de Araújo; Milani,Klayton Flávio. |
| The objectives of this study were to identify promising popcorn lines and hybrids for genetic resistance to tropical rust (Tr, Physopella zeae) in diallel crosses of nine lines derived from a large part of Brazilian popcorn germplasm and to estimate genetic parameters for Tr resistance. Crosses and checks were tested in a random block design, with artificial inoculations under greenhouse conditions. Plots consisted of a single 14-L pot, with four plants. Tr was measured by severity and area under the disease progress curve. Data was analyzed by Griffing's diallel model, and genetic parameters were estimated. Heritability estimates to Tr resistance was medium. Specific combining ability-SCA had significant effects (P<0.10) for resistance, and was eight... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Zea mays L.; Physopella zeae; Genetic parameters; General and specific combining ability; Artificial inoculation. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782011000600008 |
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| Silva,Danilo Fernando Guimarães; Coelho,Caroline de Jesus; Romanek,Cristiane; Gardingo,José Raulindo; Silva,Anderson Rodrigo da; Graczyki,Brenda Luiza; Oliveira,Eduardo Augusto Teixeira; Matiello,Rodrigo Rodrigues. |
| ABSTRACT The present study aimed to estimate the genetic divergence among corn half-sib progenies seeking to direct recombination between contrasting and superior progenies for green corn production. Ninety-six progenies were evaluated in a randomized block design with 3 replications, and 18 characteristics associated with agronomic adaptation and green corn yield were measured. The genetic divergence was estimated using generalized square Mahalanobis distance and the progenies grouped by UPGMA and Tocher’s methods. The joint analysis of variance showed genetic variability among the progenies for the characteristics evaluated. The UPGMA method was more sensitive than Tocher’s, since it led to the formation of 11 groups genetically dissimilar compared to... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Zea mays L.; Ears yield; Potential; UPGMA; Tocher. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052016000400401 |
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| Rovaris, Sara Regina Silvestrin; Oliveira, André Luís Bombonato de; Sawazaki, Eduardo; Gallo, Paulo Boller; Paterniani, Maria Elisa Ayres Guidetti Zagatto. |
| In Brazil, there is a shortage of white maize cultivars and genetic studies for special maize breeding programs. This study aimed to identify populations and promising hybrid white maize for main agronomic traits and grits processing and to estimate the genetic parameters of parents and heterosis. In the 2012/13 growing season, fifteen hybrids were obtained by complete diallel crosses, and six parental and commercial check varieties were evaluated for: female flowering (FF), ear height (EH), grain yield (GY), ear length (EL), volumetric mass (VM) and grits processing (GP) in two locations in São Paulo State, Campinas and Mococa, using a randomized block design. Analyses of variance were carried out, and diallel crosses were performed using the Gardner and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Zea mays L.; Complete diallel; Gardner and Eberhart; Grits production. Melhoramento genético de plantas. |
| Ano: 2017 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/32517 |
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| Conus,Lenita Aparecida; Cardoso,Paulo César; Venturoso,Luciano dos Reis; Scalon,Silvana de Paula Quintão. |
| O objetivo do trabalho foi avaliar o efeito do estresse salino induzido por diferentes potenciais osmóticos das soluções de NaCl, KCl e CaCl2, na germinação de sementes e no vigor de plântulas de milho. O trabalho foi constituído por dois experimentos realizados no Laboratório de Sementes da Universidade Federal da Grande Dourados e em casa de vegetação da Embrapa Agropecuária Oeste, Dourados-MS. O delineamento experimental utilizado foi inteiramente casualizado, em arranjo fatorial 3 x 6, com quatro repetições, sendo o primeiro fator constituído pelos sais e o segundo pelos potenciais osmóticos: 0,0; -0,2; -0,4; -0,8; -1,2 e -1,6MPa. Foram analisadas as variáveis: Experimento 1 - porcentagem de germinação, comprimento de parte aérea e comprimento da raiz... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Zea mays L.; Salinidade; KCl; CaCl2; NaCl. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-31222009000400008 |
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| Lorenzetti,Eloisa; Tartaro,Juliano; Alves Neto,Alfredo José; Stangarlin,José Renato; Portz,Roberto Luis; Kuhn,Odair José. |
| ABSTRACT Due to the environmental impact generated using fungicides, new alternatives for disease control have been arising, such as the use of nutrients that may act on the development of certain pathogens or decrease the host susceptibility to diseases. The objective of this work was to verify if chelates of calcium, copper, manganese and zinc inhibit the germination of Puccinia sorghi, Cercospora sp. and Exserohilum turcicum spores. Two experiments were carried out: the first with agar-water culture medium, where the treatments and spores were placed at the same moment and the second using corn leaves as substrate, where treatments were administered zero, one, two, three, four and five hours after the spores are sprayed. Calcium, copper, manganese and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Alternative control; Nutrients; Chelates; Zea mays L.. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902020000400405 |
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| Blanco,Flávio Favaro; Folegatti,Marcos Vinícius; Gheyi,Hans Raj; Fernandes,Pedro Dantas. |
| Corn (Zea mays L.) is an important crop in Brazil and is cultivated in all regions, including the semi-arid area of Brazil, where the occurrence of irrigation water with high concentration of salts is common. Evaluating the growth and yield of the maize hybrid 'AG 6690' irrigated with water of different salinity levels was the objective of this experiment. Sowing was performed in pots with 12 seeds on May 23, 2003, and seedlings were thinned to two plants per pot. Irrigation was accomplished when the mean soil matric potential of each treatment was approximately -30 kPa using water with seven different electrical conductivities (ECi), varying from 0.3 to 4.5 dS m-1, which were obtained by addition of NaCl and CaCl2 in the equivalent proportion of 1:1. The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Zea mays L.; Tolerance to salinity; Soil solution; Leaf area; Evapotranspiration. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000600002 |
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| Campelo,David H.; Teixeira,Adunias dos S.; Moreira,Luis C. J.; Lacerda,Claudivan F. de. |
| ABSTRACT The objective of this study was to evaluate the growth, the production components and the water (WUE) and nitrogen use efficiency (NUE) in maize (Zea mays L.), as function of water depths and nitrogen doses. The experimental design was randomized blocks in a split-plot scheme with four repetitions. The irrigation treatments applied in the plots were composed of four water depths: 80, 90, 100 and 110% of the water requirement, based on the soil field capacity, while the N doses, distributed in the subplots, were 0, 60, 120 and 180 kg ha-1. Increases in water depths and in N doses promote linear increases in plant height and leaf area index. For cycle I (2015) the maximum yield (16,778.3 kg ha-1) was reached with the irrigation depth of 538.1 mm and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Zea mays L.; Irrigation management; Mineral fertilization. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662019001000747 |
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| Lana,Ângela Maria Quintão; Cardoso,Antônio Américo; Cruz,Cosme Damião. |
| Foram realizados os cruzamentos entre 'Ouro 1919' x 'Ouro Negro 1992', 'Ouro 1919' x Raça D e 'Ouro 1919' x Phaseolus aborigineus 283, com o objetivo de estimar as herdabilidades, no sentido amplo e as correlações fenotípica e genotípica da produtividade de grãos e seus componentes de rendimento, nos sistemas de monocultivo e de consórcio com a cultura do milho nas épocas de semeadura das "águas" e da "seca'. Para obtenção dessas estimativas, utilizaram-se, no ensaio de campo, as populações, F1, F2 e F3 e seus genitores. As populações segregantes foram conduzidas pelo método de melhoramento "Single Seed Descent" (SSD). De modo geral, os coeficientes de herdabilidade foram maiores no sistema de consórcio do que no monocultivo. Entre os caracteres estudados,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Phaseolus vulgaris L.; Zea mays L.; Sistemas de cultivo; Single seed descent; Seleção. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782003000600006 |
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| Cervantes-Ortiz,Francisco; García-De los Santos,Gabino; Carballo-Carballo,Aquiles; Bergvinson,David; Crossa,J. Luis; Mendoza-Elos,Mariano; Moreno-Martínez,Ernesto. |
| Resumen En los programas de fitomejoramiento es importante el vigor de la semilla y de la plántula para asegurar la germinación, emergencia, y desarrollo inicial de la planta. El objetivo de este estudio fue determinar el tipo de herencia de caracteres relacionados con el vigor de la plántula de maíz y de la planta adulta, así como correlacionar el vigor inicial de plántula con los caracteres de la planta adulta. Con este fin se usaron los efectos de aptitud combinatoria general (ACG), aptitud combinatoria específica (ACE) y efectos recíprocos (ER) obtenidos de la evaluación de seis líneas endogámicas de maíz tropical y sus cruzas directas y recíprocas en un diseño dialélico. Los 30 híbridos resultantes se evaluaron en Tepalcingo, Morelos, e Iguala,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Zea mays L.; Aptitud combinatoria; Heredabilidad; Varianzas genéticas. |
| Ano: 2007 |
URL: http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S1405-31952007000400425 |
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| Esquivel Esquivel, Gilberto. |
| Con el objeto de evaluar heterosis y los efectos de aptitud combinatoria general (ACG) y específica (ACE) en relación con la amplitud de origen geográfico en etapas tempranas del desarrollo y en productividad en campo, se evaluaron en un arreglo dialélico, diseño II de Griffing 15 poblaciones progenitoras nativas de maíz, sus 105 cruzamientos y otros genotipos adicionales de los Valles Altos de México. Se incluyeron poblaciones progenitoras cuyo origen se ubica en el área de distribución geográfica de la raza Chalqueño (Valles Altos de México) con antecedentes en programas de mejoramiento genético en los Valles Altos de México; ademàs, se incluyeron poblaciones nativas del área de la raza Chalqueño o sus variantes (Chalqueño-Celaya, Chalqueño-Cónico). Para... |
| Tipo: Tesis |
Palavras-chave: Zea mays L.; Vigor inicial; Heterosis; Cruzas dialélicas; Chalqueño; Doctorado; Genética; Early vigor; Heterosis; Diallelic crosses. |
| Ano: 2008 |
URL: http://hdl.handle.net/10521/1618 |
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| De la Cruz-Lázaro,E; Castañón-Najera,G; Brito-Manzano,NP; Gómez-Vázquez,A; Robledo-Torres,V; Lozano del Río,AJ. |
| La estimación de parámetros genéticos en experimentos de cruzas dialélicas ayuda en la toma de decisiones objetivas en los programas de mejoramiento genético. Los objetivos de la presente investigación fueron estimar la heterosis, la aptitud combinatoria general (ACG) de ocho poblaciones de maíz (Zea mays L.) y la aptitud combinatoria específica (ACE) de 28 cruzas directas. Las poblaciones evaluadas fueron: 21, 22, 23, 25, 32, 43, 49 y la variedad comercial VS 536. Para estimar los efectos de ACG y ACE se empleó el método 2 de efectos aleatorios del dialélico de Griffing, en un diseño experimental de bloques completos al azar con dos repeticiones por fecha de siembra. El análisis dialélico indicó diferencias estadísticas (p=0,01 y p=0,05) en las fuentes de... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Zea mays L.; Aptitud combinatoria; Cruzas dialélicas; Heterosis; Maíz tropical. |
| Ano: 2010 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572010000100003 |
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| Silva, Vanessa Quitete Ribeiro da; Universidade Estadual do Norte Fluminense; Amaral Júnior, Antonio Teixeira do; Universidade Estadual do Norte Fluminense; Gonçalves, Leandro Simões Azeredo; Universidade Estadual do Norte Fluminense; Freitas Júnior, Silvério de Paiva; Universidade Estadual do Norte Fluminense; Ribeiro, Rodrigo Moreira; Universidade Estadual do Norte Fluminense. |
| We examined the heterotic parameterizations of diallel crosses among 10 popcorn inbred lines in two different environments (municipalities of Campos dos Goytacazes and Itaocara, Rio de Janeiro State) and originating from tropical, temperate and subtropical germoplasm. Traits, including grain yield (GY), plant height (PH), ear height (EH), days to silking (FL) and popping expansion (PE), were measured. The inbred lines and the hybrids were evaluated in a randomized complete block design with three replications. The sources of genotypic variation, inbred lines and heterosis had significant effects on all traits. When the sources of heterotic variation were compared separately, estimated mean heterosis was found to be significant for all traits. When inbred... |
| Tipo: Pesquisa Empírica de Campo |
Palavras-chave: 5.02.01.03-4; Zea mays L.; Diallel crosses; Yield and popping expansion 5.02.01.03-4 Zea mays L.; Diallel crosses; Yield and popping expansion. |
| Ano: 2011 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/9607 |
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| Vieira, Rafael Augusto; UEM; Souza Neto, Israel Leite; UEM; Bignotto, Lucas Souto; UEM; Cruz, Cosme Damião; UFV; Amaral Júnior, Antonio Teixeira do; UENF; Scapim, Carlos Alberto; UEM. |
| Six popcorn varieties were crossed in a diallel mating scheme to obtain 15 F1 hybrids, with the purpose of analyzing the estimates of heterotic parametrization for agronomically important traits. The genitors and hybrids were evaluated in randomized block design with three replications in Viçosa and Visconde do Rio Branco, in Minas Gerais State, Brazil, in three growing seasons. Six traits were evaluated, including grain yield and popping expansion. There were highly significant effects for treatments, varieties and mean heterosis for plant and ear heights, and for the others traits the significance extended to all sources of variation. Amarela and Viçosa revealed superiority for grain yield in relation to performance per se, while Rosa Claro expressed the... |
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Palavras-chave: 5.01.00.00-9 Agronomia diallel; Heterosis; Popping expansion; Bidirectional dominance; Zea mays L. diallel; Heterosis; Popping expansion; Bidirectional dominance; Zea mays L.. |
| Ano: 2009 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/4689 |
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| Rocandio Rodríguez, Mario. |
| Dentro de la diversidad del maíz (Zea mays L.) de México, uno de los grupos de mayor interés es el del complejo piramidal que se cultiva en Valles Altos centrales de México. Con la finalidad de caracterizar la diversidad genética de siete razas de maiz de Valles Altos, se realizó un estudio utilizando variables morfológicas y marcadores moleculares (SSRs). Se hizo, además, un análisis simultáneo de los datos disponibles sobre dos líneas de evidencia, para hacer clasificaciones más robustas. Se incluyeron entre 8 y 26 accesiones que han sido consideradas por diferentes autores como representativas de las razas Arrocillo Amarillo, Cónicos, Elotes Cónicos, Palomero Toluqueño, Chalqueño y Purépecha. La adquisición de semillas se realizó mediante solicitud a... |
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Palavras-chave: Zea mays L.; Diversidad genética; Marcadores moleculares; Teocintle; Análisis conjunto; Genetic diversity; Molecular markers; Teosinte; Joint analysis; Genética; Doctorado. |
| Ano: 2013 |
URL: http://hdl.handle.net/10521/2092 |
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| Registros recuperados: 277 | |
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