Consulta: subjectFacets:"Diallel"
Registros recuperados: 15
Data/hora: 10/06/2024 15:21:21

Multivariate analysis of combining ability for soybean resistance to Cercospora sojina Hara
Provedor de dados: 74
Autores: Gravina,Geraldo de Amaral; Sediyama,Carlos Sigueyuki; Martins Filho,Sebastião; Moreira,Maurílio Alves; Barros,Everaldo Gonçalves de; Cruz,Cosme Damião.
Seven soybean cultivars (Bossier, Cristalina, Davis, Kent, Lincoln, Paraná and Uberaba), with different levels of resistance to Cercospora sojina, race 04, were crossed according to a diallel design, with no reciprocals, to determine the general and the specific combining abilities for the resistance. The evaluations of the reaction to the disease were performed 20 days after the inoculation of the fungus on the most infected leaflet of the plant, in the parents and in the F1 hybrids. To quantify the resistance, the following characteristics were evaluated: infection degree (ID); number of lesions per leaflet (NLL); lesion mean diameter (LMD); lesioned leaf area (LLA); percentage of lesioned leaf area (PLLA); number of lesions per square centimeter (NLC)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Diallel; Canonical variables; Frogeye leaf spot.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572004000300015

Combining ability of elite clones of Eucalyptus grandis and Eucalyptus urophylla with Eucalyptus globulus
Provedor de dados: 74
Autores: Bison,Odair; Ramalho,Magno Antonio Patto; Rezende,Gabriel Dehon Sampaio Peçanha; Aguiar,Aurélio Mendes; Resende,Marcos Deon Vilela de.
In Brazil, eucalyptus breeding programs for cellulose production has used two species, Eucalyptus grandis and Eucalyptus urophylla. Nevertheless, it would be useful to introgress alleles from other species to improve wood quality and volume. The objective of this research was to evaluate the hybrid potential of elite clones of E. grandis and E. urophylla from the Aracruz Celulose Company S. A. with Eucalyptus globulus clones. To do so, six elite clones were crossed with ten E. globulus clones in a half-diallel mating design. The resulting hybrid combinations as well as the four check clones were evaluated in randomized complete block experiments with single plant plots and 40 replicates from September to October 2001 at three Brazilian sites, Aracruz and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diallel; Eucalyptus breeding; Hybrids; Quantitative genetics; Wood quality.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572007000300019

Inbreeding depression of 28 maize elite open pollinated varieties
Provedor de dados: 74
Autores: Pacheco,Cleso Antônio Patto; Santos,Manoel Xavier dos; Cruz,Cosme Damião; Parentoni,Sidney Netto; Guimarães,Paulo Evaristo de Oliveira; Gama,Elto Eugênio Gomes e; Silva,Álvaro Eleutério da; Carvalho,Hélio Wilson Lemos de; Vieira Júnior,Pedro Abel.
The study of inbreeding depression is important for breeding strategies such as use of inbred progenies or extraction of inbreed lines. A diallel of 28 maize open-pollinated varieties was evaluated in 10 environments in the early 1990s. At the same time, S1 populations for each of the 28 varieties were evaluated in the same 10 experiments (environments). Yield reductions of the populations from S0 to S1 (mean of the 10 environments), varied from 34.6% (CMS-01) to 59.2% (CMS-30), with an average of 49.1%. Inbreeding depression was greater in populations with a wider genetic base, which had never been exposed to inbreeding (CMS-30, BR-107, PH4, Cunha, Saracura, Nitrodent, and Nitroflint). Inbred lines with greater yield means should be obtained from the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Inbreeding depression; Endogamy; Maize; Breeding; Diallel.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572002000400014

Choice of common bean parents based on combining ability estimates
Provedor de dados: 74
Autores: Machado,Cristina de Fátima; Santos,João Bosco dos; Nunes,Glauber Henrique de Sousa; Ramalho,Magno Antonio Patto.
The obtention of genetically improved cultivars is the main objective of breeding programs, whose efficiency is increased by a careful choice of parents. Based on both general (GCA) and specific (SCA) combining abilities for grain yield, the purpose of this research was to choose the most promising populations of common beans, for line selection. GCA and SCA were measured by means of a complete diallel without reciprocals, using twelve cultivars/lines. Parents and corresponding F2 segregating populations were evaluated for grain yield by a 9 x 9 triple square lattice design. It was found that the segregating populations differed in grain yield, with predominant SCA effects, but with significant GCA effects as well. Among the populations derived from...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris; Specific and general combining ability; Diallel.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572002000200011

Additive and non-additive genetic effects for fruit traits of ornamental pepper
Provedor de dados: 75
Autores: Pessoa,Angela Maria dos S; Rêgo,Elizanilda R do; Rêgo,Maílson M do.
ABSTRACT Pepper plants can be used as ornamental ones due to the contrasting traits of plants, flowers, and especially fruits. This variability can be exploited in genetic improvement programs aiming at identifying superior genotypes and obtaining hybrids. This work aimed to select parental and hybrid individuals through diallel analysis for fruit traits in Capsicum annuum. Seven pepper genotypes were crossed, and eleven fruit-related quantitative traits were evaluated. The data were subjected to diallel analysis using Griffing’s Method 1 (fixed model). There was a predominance of additive genetic effects on the fruit traits of ornamental pepper plants. Genotypes UFPB77.3 and UFPB390 are indicated as parents for the improvement of ornamental pepper plants,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Capsicum annuum; Diallel; Hybridization.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362021000100039

Combining ability of maize grain yield under different levels of environmental stress
Provedor de dados: 86
Autores: 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

Genetic distance estimated by RAPD markers and its relationship with hybrid performance in maize
Provedor de dados: 86
Autores: Bruel,Daniela Cristina; Carpentieri-Pípolo,Valéria; Gerage,Antonio Carlos; Fonseca Júnior,Nelson da Silva; Prete,Cássio Egídio Cavenaghi; Ruas,Claudete de Fátima; Ruas,Paulo Maurício; Souza,Silvia Graciele Hülse de; Garbuglio,Deoclécio Domingos.
The objective of this work was to evaluate the genetic diversity of 16 maize inbred lines, and to determine the correlation between genetic distance and hybrid performance, using random amplified polymorphic DNA (RAPD) molecular markers. Twenty-two different random primers were used, which resulted in the amplification of 265 fragments, 237 (84.44%) of them being polymorphic. A genetic similarity matrix was created from the RAPD data, using Jaccard coefficient, and a dendrogram was constructed. Hybrid analyses were carried out using random block design and Griffing method VI for diallel crossings. The genetic associations showed five distinct heterotic groups. Correlations between genetic divergences detected by RAPD, as well as the means observed in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Diallel; Heterotic patterns; Molecular markers.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2006001000006

Heterosis in sweet sorghum
Provedor de dados: 86
Autores: Lombardi,Gabrielle Maria Romeiro; Navegantes,Patricia Cardoso Andrade; Pereira,Carlos Henrique; Fonseca,Jales Mendes Oliveira; Parrella,Rafael Augusto da Costa; Castro,Fernanda Maria Rodrigues; Rocha,Mara Jane da; Ornelas,Daniela Oliveira; Bruzi,Adriano Teodoro; Nunes,José Airton Rodrigues.
Abstract: The objective of this work was to evaluate the potential per se of male-sterile and fertility-restorer lines of sweet sorghum (Sorghum bicolor), as well as to detail the heterosis manifested for some traits directly or indirectly related to ethanol production, accumulation rate, and predictability. Evaluations were performed for 20 genotypes, of which 4 are fertility-restorer lines (R), 3 are male-sterile lines (A), and 12 are experimental hybrids (H) resulting from the partial diallel cross between lines A and R, besides a commercial hybrid CV198 used as a check, in four harvest seasons. The experiments were carried out in the municipalities of Lavras and Sete Lagoas, in the state of Minas Gerais, Brazil. The measured traits were plant height,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sorghum bicolor; Diallel; Hybrid vigor; Male-sterility; Parental selection.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018000500593

Stability of combining ability effects in maize hybrids
Provedor de dados: 63
Autores: Machado,Juarez Campolina; Souza,João Cândido de; Ramalho,Magno Antonio Patto; Lima,José Luís.
General and specific combining ability effects are important indicators in a maize (Zea mays L.) breeding program aiming hybrid development. The objectives of the present study were to estimate the general (GCA) and specific combining abilities (SCA) effects of commercial maize hybrids using a complete diallel scheme and to assess the stabilities of these estimates. Fifty-five entries were assessed; ten commercial single-crosses and all possible double-crosses. The experiments were carried out in 12 environments in the 2005/06 growing season. A randomized complete block design was used with three replications per environment. Ear yield was evaluated, corrected to 13% of moisture content. The combined diallel analysis involving all environments was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays L.; Diallel; Nonparametric statistics.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000400010

Selection of parents for low nitrogen stress through the combining ability of maize partially inbred lines
Provedor de dados: 1
Autores: Heinz, Rafael; Ribeiro, Larissa Pereira; Gonçalves, Manoel Carlos; Bhering, Leonardo Lopes; Teodoro, Paulo Eduardo.
The objective of this work was to estimate the general combining ability of partially inbred lines under high and low nitrogen (N) conditions and to select promising lines to obtain high yields for both conditions. Fifty-five partially inbred S1 progenies were evaluated using the top-cross method, where the lines were crossed with two testers. The 110 top-cross hybrids were evaluated for grain yield during the off-season of 2012 at two sites in the Brazilian Midwest. Partial diallel analysis was performed with the adjusted means of each of the individual analyses of the top crosses. The combining ability of partially inbred lines and testers as well as their interaction with N levels, was estimated for each site. The coefficient of concordance among 15...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diallel; Hybrid combination; Top-cross; Zea mays L. diallel; Hybrid combination; Top-cross; Zea mays L.
Ano: 2019
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/42705

Identification of populations and hybrid combinations of maize for in natura consumption
Provedor de dados: 53
Autores: Rocha,Daniel Sarto; Rovaris,Sara Regina Silvestrin; Rodrigues,Cinthia Souza; Ticelli,Marcelo; Sawazaki,Eduardo; Paterniani,Maria Elisa Ayres Guidetti Zagatto.
ABSTRACT Brazil is one of the leading countries in the production of maize (Zea mays), with great potential for growing green maize, which has a superior commercial value in relation to maize marketed in the form of grains. Although important, the availability of cultivars recommended for the production of green maizeis still very scarce. The objectives of the present study were to estimate genetic parameters and to identify promising hybrid combinations for the development of new green maize cultivars to farmers. In the summer crop of 2016/17, ten hybrid combinations obtained through a complete diallel of five maize populations, with attributes for in natura consumption, were evaluated in two sites of the state of São Paulo, Brazil: the Instituto...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Diallel; Green maize; Special corns; Gene effects.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052019000400535

Selection of maize top-crosses for different nitrogen levels through specific combining ability
Provedor de dados: 53
Autores: Heinz,Rafael; Ribeiro,Larissa Pereira; Gonçalves,Manoel Carlos; Bhering,Leonardo Lopes; Teodoro,Paulo Eduardo.
ABSTRACT An alternative to increase yield without raising the production costs and minimizing the dependence of agricultural inputs is the development of maize genotypes presenting high nitrogen (N) use efficiency under low N level conditions. Thus, the objective of this study was to estimate the specific combining ability of maize top-crosses under high and low nitrogen (N) conditions and to select high-yielding hybrids for both conditions. The grain yield of 110 top-cross hybrids was evaluated in 2012 in two locations in the Brazilian Midwest. Partial diallel analysis was performed with the adjusted means of each of the individual top-cross analyses. Specific combining ability (SCA) of the hybrids and their interaction with N levels was estimated for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays L.; Diallel; Hybrid combination; Nitrogen use efficiency.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052019000200208

Genetic Analysis of Relative Cell Injury Percentage and Some Yield Contributing Traits in Wheat Under Nomral and Heat Stress Conditions
Provedor de dados: 117
Autores: Farooq,Jehanzeb; Khaliq,Ihsan; Kashif,Muhammad; Ali,Qurban; Mahpara,Shahzadi.
Several wheat genotypes were screened against heat stress. Seven wheat (Triticum aestivum L.) cultivars obtained after screening against heat classified as tolerant, moderately tolerant, and susceptible to heat stress, were mated in a complete diallel mating system to study the inheritance pattern of relative cell injury percentage (cell injury %) and some yield contributing parameters under normal and heat stress conditions. Significant genotypic differences were found (P &lt; 0.01) for all the studied traits under both regimes. The scaling test disclosed partial adequacy for traits such as days to heading and days to maturity, but for flag leaf area and relative cell injury %, it showed full sufficiency under both environments. The model for grain yield...
Tipo: Journal article
Palavras-chave: Relative cell injury percentage; Additive components; Adequacy test; Heritability; Wheat; Diallel.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392011000400003

Combining ability of tropical maize cultivars in organic and conventional production systems
Provedor de dados: 65
Autores: Oliveira,Lucimar Rodrigues de; Miranda,Glauco Vieira; DeLima,Rodrigo Oliveira; Souza,Leandro Vagno de; Galvão,João Carlos Cardoso; Santos,Izabel Cristina dos.
The objectives were to identify maize germplasm for the organic productions system and to compare the genetic effects of the grain yield of maize cultivars in organic and conventional production systems. Diallel crosses were made between six maize cultivars and the hybrid combinations were evaluated in conventional and organic production systems. The hybrid combinations produced different grain yields in the two production systems. The interaction between general combining ability and production systems was significant for grain yield, ear height and number of ears. This indicates that the additive genetic effects differ in organic and conventional production systems. The specific combining abilities (SCA) were significant for grain yield and plant height,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Breeding; Selection; Diallel; Genotype x environment interaction.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782011000500001

Performance of testers with different genetic structure for evaluation of maize inbred lines
Provedor de dados: 65
Autores: 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