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| Souza,Leandro Vagno de; Miranda,Glauco Vieira; Galvão,João Carlos Cardoso; Guimarães,Lauro José Moreira; Santos,Izabel Cristina dos. |
| The objectives of this work were to caracterize the tropical maize germplasm and to compare the combining abilities of maize grain yield under different levels of environmental stress. A diallel was performed among tropical maize cultivars with wide adaptability, whose hybrid combinations were evaluated in two sowing dates, in two years. The significance of the environmental effect emphasized the environmental contrasts. Based on grain yield, the environments were classified as favorable (8,331 kg ha-1), low stress (6,637 kg ha-1), high stress (5,495 kg ha-1), and intense stress (2,443 kg ha-1). None of the genetic effects were significant in favorable and intense stress environments, indicating that there was low germplasm variability under these... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Zea mays; Abiotic stress; Breeding; Diallel; Drought. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2009001000013 |
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| Souza,Leandro Vagno de; Miranda,Glauco Vieira; Galvão,João Carlos Cardoso; Eckert,Fernando Roberto; Mantovani,Éder Eduardo; Lima,Rodrigo Oliveira; Guimarães,Lauro José Moreira. |
| The objectives of this work were to study the genetic control of grain yield (GY) and nitrogen (N) use efficiency (NUE, grain yield/N applied) and its primary components, N uptake efficiency (NUpE, N uptake/N applied) and N utilization efficiency (NUtE, grain yield/N uptake), in maize grown in environments with high and low N availability. Experiments with 31 maize genotypes (28 hybrid crosses and three controls) were carried out in soils with high and low N rates, in the southeast of the state of Minas Gerais, Brazil. There was a reduction of 23.2% in average GY for maize grown in soil with low N, in comparison to that obtained with high N. There were 26.5, 199 and 400% increases in NUtE, NUpE, and NUE, respectively, for maize grown with low N. The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Zea mays; Abiotic stress; Absorption efficiency; Combining ability; Commercial hybrids; Utilization efficiency. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2008001100010 |
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| Guimarães,Lauro José Moreira; Miranda,Glauco Vieira; DeLima,Rodrigo Oliveira; Maia,Ciro; Oliveira,Lucimar Rodrigues de; Souza,Leandro Vagno de. |
| The objective of this study was to evaluate four maize testers for identification of superior inbreed lines in testcross. The four testers evaluated are cultivars with narrow or wide genetic base (single-cross hybrids and open pollinated varieties) and two kernel types (flint or dent). SynD and SynF testers are open pollinated varieties with dent and flint kernels, respectively, and FSH and DSH testers are single-cross hybrids with flint and dent kernels, respectively. SynD tester showed the biggest genetic variance among the maize inbreed lines in crosses. The effects of general combining ability (GCA) for lines and specific combining ability (SCA) for lines x testers were significant, whereas GCA effects for testers were not significant. SynD and SynF... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Zea mays; Diallel; Testcross; Combining ability. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782012000500002 |
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| Faluba,Joyce de Souza; Miranda,Glauco Vieira; DeLima,Rodrigo Oliveira; Souza,Leandro Vagno de; Debem,Enoch Assis; Oliveira,Ana Maria Cruz e. |
| Neste trabalho, objetivou-se avaliar o potencial genético da população de milho UFV 7 para o melhoramento em Minas Gerais. Foram instalados três experimentos com a população de milho UFV 7, em três regiões de Minas Gerais, na safra 2006/2007. Houve interação genótipos x ambientes para todos os caracteres. Foi verificada variabilidade genética para produtividade de grãos, altura de plantas e altura de espigas na população de milho UFV 7, nas três regiões. Na região Sudeste, a população de milho UFV 7 apresentou as maiores estimativas de parâmetros genéticos. A população UFV 7 apresentou alta produtividade de grãos, 9 112kg ha-1, no Sudeste, média produtividade, 6 510kg ha-1, no Oeste, e baixa, 4 572kg ha-1, na região Central. As estimativas de herdabilidade... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Parâmetros genéticos; Correlação; Seleção. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782010000600002 |
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| Souza,Ana Raquel Ribeiro e; Miranda,Glauco Vieira; Pereira,Messias Gonzaga; Souza,Leandro Vagno de. |
| The objectives of this research were to evaluate the genetic variability and predict genetic gain in the white maize landrace rescued in Barbacena, Minas Gerais, Brazil. The Brazilian maize landraces have economic and social importance for certain areas in Brazil, and research on this germplasm is very important for local food security. Three experiments were carried out with 100 half-sib progenies, in Campos dos Goytacazes, RJ, Coimbra and Barbacena, Minas Gerais, Brazil. These sites were chosen for their soil and climatic differences. An analysis of variance was significant among the progeny for all characters, indicating the presence of genetic variability between the three populations. In Campos dos Goytacazes and Coimbra, the genetic variation of the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Selection; Rescue; Breeding. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782009000100004 |
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