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Search Results: 1 - 10 of 15869 matches for " Pacheco Cleso Ant?nio Patto "
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Association between Griffing's diallel and the adaptability and stability of Eberhart and Russel
Pacheco, Cleso Antnio Patto;Cruz, Cosme Dami?o;Santos, Manoel Xavier dos;
Genetics and Molecular Biology , 1999, DOI: 10.1590/S1415-47571999000300027
Abstract: the objective of the present work was to provide a methodology to study the inheritance of adaptability and stability through the breakdown of eberhart and russell regression coefficients and regression deviations in effects due to the mean and additive genetic effects (gi's and gj's) as well as dominance effects (sij's) of griffing′s methodology, when the diallel is conducted in several environments. it was concluded that the adaptability and stability parameters are determined in the same manner as are genetic effects. so an f1 cross inherits half the general combining ability (gca) mean effect from each parent, while the effects due to specific combining ability (sca) are subjected to the same considerations relative to sij's, i.e., they are dependent on specific combinations.
Avalia??o de quatro alternativas de análise de experimentos em látice quadrado, quanto à estima??o de componentes de variancia
SILVA, HEYDER DINIZ;FERREIRA, DANIEL FURTADO;PACHECO, CLESO ANTNIO PATTO;
Bragantia , 2000, DOI: 10.1590/S0006-87052000000100018
Abstract: the efficiency of fur alternatives of analysis of experiments in square lattice, related to the estimation of variance components, was studied through computational simulation of data: i) intrablock analysis of the lattice with adjusted treatments (first analysis); ii) lattices analysis as a randomized complete blocks design (second analysis); iii); intrablock analysis of the lattice with non-adjusted treatments (third analysis); iv) lattice analysis as a randomized complete blocks design, using the adjusted means of treatments, obtained through the analysis of lattice with recuperation of interblocks information, having as the residual mean square, the average effective variance of this same lattice analysis (fourth analysis). the results showed that the intrablock model, must be used with adjusted treatments in lattice experiments to estimate variance components every time that the relative efficiency of the lattice design, relatively to the randomized complete blocks design be upper to 100%, and in the opposite case the randomized complete blocks design model must be used. the fourth alternative of analysis must not be recommended in both situations.
Prediction of genotypic values of maize for the agricultural frontier region in northeastern Maranh?o, Brazil
Arnhold, Emmanuel;Mora, Freddy;Pacheco, Cleso Antnio Patto;Carvalho, Hélio Wilson Lemos de;
Crop Breeding and Applied Biotechnology , 2012, DOI: 10.1590/S1984-70332012000200009
Abstract: agricultural research, mainly focused on the evaluation of maize cultivars along agricultural frontiers, are scarce. this study assessed 128 maize genotypes in the agricultural frontier region of the state of maranh?o, between 2008 and 2009. the experiment was arranged in a lattice design with two replications. the genotypes were evaluated for grain yield in a mixed model, with fixed intercept and experimental effects. the random effects were genotype, genetic class (single-, double or triple-cross hybrid and variety), and incomplete block/replication/ environment. the genotype effect was significant by the likelihood ratio test in all models, highlighting the genotypic values of the single-cross hybrids dkb177, ag8088 and dkb390, the triple-cross pl6882, the double-cross bm502 and of the open-pollinated variety shs3031.
Heterosis in crosses among white grain maize populations with high quality protein
Rodrigues, Márcio Costa;Chaves, Lázaro José;Pacheco, Cleso Antnio Patto;
Pesquisa Agropecuária Brasileira , 2006, DOI: 10.1590/S0100-204X2006000100009
Abstract: the objective of this work was to investigate heterosis and its components in 16 white grain maize populations presenting high quality protein. these populations were divided according to grain type in order to establish different heterosis groups. the crosses were carried out according to a partial diallel cross design among flint and dent populations. seven agronomic traits were evaluated in three environments while four leaf diseases and incidence of corn stunt were evaluated in one. least square procedure was applied to the normal equation x'xb = x'y, to estimate the model effects and their respective sum of squares. among the heterosis components, in diallel analysis, significance for average heterosis in grain yield, number of days to female flowering and to all evaluated diseases was detected. specific heterosis was significant for days to female flowering and resistance to puccinia polysora. results concerned to grain yield trait indicate that populations with superior performance in dent group, no matter what flint population group is used in crosses, tend to generate superior intervarietal hybrids. in decreasing order of preference, the dent type populations cms 476, zqp/b 103 and zqp/b 101 and the flint type cms 461, cms 460, zqp/b 104 and zqp/b 102 are recommended to form composites.
Predi??o de ganho genético com diferentes índices de sele??o no milho pipoca CMS-43
Granate, Maria José;Cruz, Cosme Dami?o;Pacheco, Cleso Antnio Patto;
Pesquisa Agropecuária Brasileira , 2002, DOI: 10.1590/S0100-204X2002000700014
Abstract: simultaneous breeding for expansion volume and grain yield in popcorn (zea mays l.) is difficult because of negative correlation between these traits. the use of selection indexes allows to overcome this difficulty. in 1997/1998, at embrapa-centro nacional de pesquisa de milho e sorgo, in sete lagoas, mg, brazil,166 half-sib families from cms-43 popcorn were evaluated, using random blocks design. the selection indexes used were smith and hazel, pesek & baker, elston and williams. the selection index of smith and hazel allowed larger predicted gains in more traits, and on the contrary, the prediction using the selection index of williams was insignificant. the use of selection indexes allows simultaneous prediction of gains in the two main traits.
NOTE - Prediction of genotypic values of maize for the agricultural frontier region in northeastern Maranh o, Brazil
Emmanuel Arnhold,Freddy Mora,Cleso Antnio Patto Pacheco,Hélio Wilson Lemos de Carvalho
Crop Breeding and Applied Biotechnology , 2012,
Abstract: Agricultural research, mainly focused on the evaluation of maize cultivars along agricultural frontiers, are scarce. This study assessed 128 maize genotypes in the agricultural frontier region of the State of Maranh o, between 2008 and 2009. The experiment was arranged in a lattice design with two replications. The genotypes were evaluated for grain yield in a mixed model, with fixed intercept and experimental effects. The random effects were genotype, genetic class (single-, double or triple-cross hybrid and variety), and incomplete block/replication/ environment. The genotype effect was significant by the likelihood ratio test in all models, highlighting the genotypic values of the single-cross hybrids DKB177, AG8088 and DKB390, the triple-cross PL6882, the double-cross BM502 and of the open-pollinated variety SHS3031.
Association between Griffing's diallel and the adaptability and stability of Eberhart and Russel
Pacheco Cleso Antnio Patto,Cruz Cosme Dami?o,Santos Manoel Xavier dos
Genetics and Molecular Biology , 1999,
Abstract: The objective of the present work was to provide a methodology to study the inheritance of adaptability and stability through the breakdown of Eberhart and Russell regression coefficients and regression deviations in effects due to the mean and additive genetic effects (gi's and gj's) as well as dominance effects (sij's) of Griffing′s methodology, when the diallel is conducted in several environments. It was concluded that the adaptability and stability parameters are determined in the same manner as are genetic effects. So an F1 cross inherits half the general combining ability (GCA) mean effect from each parent, while the effects due to specific combining ability (SCA) are subjected to the same considerations relative to sij's, i.e., they are dependent on specific combinations.
Inbreeding depression of 28 maize elite open pollinated varieties
Pacheco Cleso Antnio Patto,Santos Manoel Xavier dos,Cruz Cosme Dami?o,Parentoni Sidney Netto
Genetics and Molecular Biology , 2002,
Abstract: 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 BR-105, BR-111, CMS-01, CMS-03, BR-106, CMS-14c, and CMS-28 populations. The use of parameter estimates generated by analysis of inbreeding depression, allow to make inferences about frequencies of deleterious alleles in the population. The frequencies of favorable alleles in the parents can be obtained by diallel analysis. The association of these two types of information, can provide a better interpretation of the genetic parameters and also can improve the process of selection of parents for either an intra- or an inter-populational breeding program.
Adaptabilidade e estabilidade de cultivares de milho-pipoca na regi o centro-sul do Brasil
Vendruscolo Eliane Cristina Gruszka,Scapim Carlos Alberto,Pacheco Cleso Antnio Patto
Pesquisa Agropecuária Brasileira , 2001,
Abstract: Este trabalho teve como objetivo estudar a adaptabilidade e estabilidade de cultivares de milho-pipoca avaliadas pela Embrapa-Centro Nacional de Pesquisa de Milho e Sorgo, no ano agrícola 1991/92. Foram avaliadas 15 cultivares em 19 locais quanto à produtividade, e em 15 locais quanto ao índice de capacidade de expans o (ICE) na regi o centro-sul do Brasil. As cultivares GO 100P, MF 1001, Pirapoca-Amarela, Pirapoca-Branca e Colorado Pop 1, foram mais promissoras, pois apresentaram boas médias de produtividade (1.700 a 2.100 kg/ha de gr os) e razoáveis ICE (17 a 21 mL/mL). Quanto à variável produtividade, as cultivares Pirapoca-Amarela e Colorado Pop 1 apresentaram-se adaptadas a ambientes favoráveis, e foram estáveis. As cultivares MF 1001, Pirapoca-Branca e GO 100P, demonstraram capacidade satisfatória no aproveitamento dos estímulos ambientais, e foram estáveis. Todas foram estáveis em rela o ao ICE, e as cultivares MF 1001, Colorado Pop 1, Pirapoca-Amarela e Pirapoca-Branca demonstraram capacidade satisfatória no aproveitamento dos estímulos ambientais. A cultivar GO 100P foi melhor adaptada para ambientes favoráveis.
AVALIA O DE ALGUNS ASPECTOS QUALITATIVOS E QUANTITATIVOS DE CULTIVARES DE MILHO PIPOCA (Zea mays L.) QUALITATIVE AND QUANTITATIVE EVALUATION OF POPCORN (Zea mays) CULTIVARS
Paulo Alcanfor Ximenes,Maria Célia Lopes Torres,Cleso Antnio Patto Pacheco,Danilo Couto
Pesquisa Agropecuária Tropical , 2007, DOI: 10.5216/pat.v25i2.2914
Abstract: O milho pipoca é muito consumido pela popula o brasileira, havendo da parte dos pesquisadores e produtores uma procura constante de cultivares mais produtivas e adequadas ao cultivo em escala comercial. Com objetivo de avaliar cultivares de milho de pipoca, conduziu-se um experimento no ano agrícola de 1992/93 na Escola de Agronomia da Universidade Federal de Goiás. O ensaio constituiu-se de 19 tratamentos com 04 repeti es no delineamento de blocos ao acaso. Os tratamentos constituíram-se de 19 cultivares, constantes do Ensaio Nacional de Milho Pipoca coordenado pelo CNPMS/EMBRAPA, a seguir relacionadas: H-16, CMS 42 C-I, CMS 42 C-II, CMS 43 C-I, CMS 43 C-II, UNB-2, PIRAPOCA EPAMIG, ZéLIA-0l, SAM (STA. CECíLIA), ROGO POP 1, ROGO POP 2, ROGO POP 3, MF 1001, MF 1002, GO 100-P, COLORADO POP 1, COLORADO POP 2, RS-20 e BR-440. Avaliaram-se altura de plantas, altura de inser o da 1a espiga, % de plantas doentes, índice de espigas, stand final, produ o de gr os/ha e o índice de capacidade de expans o (C.E.). A cultivar que apresentou a maior produ o de gr os/ha foi a H-16 (2.928 kg/ha), mas teve uma C.E. muito baixa (11,9). Destacou-se o híbrido triplo Zélia - 0l, com uma capacidade de expans o 22,1 e uma produ o de 1.770 kg/ha, 12% mais produtiva do que a testemunha S.A.M. (1.492 kg/ha e C.E.= 15,5), a mais plantada no Brasil. Observou-se uma forte correla o positiva entre a produ o com a época de florescimento feminino, índice de espigas, altura de plantas e de espigas. N o foi observada nenhuma correla o entre a capacidade de expans o e os outros caracteres estudados. PALAVRAS-CHAVE: Milho-de-pipoca; cultivar; Zea mays. This study was carried out at Escola de Agronomia of’ Universidade Federal de Goiás in the 1992/93 agricultural year with the purpose of evaluating popcorn cultivars for Goiania-GO region. The essay had 19 treatments on a randomized complete design block with 4 repetitions. The following cultivars were used as part of the Popcorn National Essay coordinated by CNPMS/EMBRAPA: H-16, CMS 42 C-I, CMS 42 C-II, CMS 43 C-I, CMS 43 C-II, UNB-2, PIRAPOCA EPAMIG, ZéLIA-0l, SAM (STA. CECíLIA), ROGO POP 1, ROGO POP 2, ROGO POP 3, MF 1001, MF 1002, GO 100-P, COLORADO POP 1, COLORADO POP 2, RS-20 and BR-440. It was evaluated plant height and first ear insertion height, sick plants percentage, ear index, final stand, grain/ha yield and popping expansion capacity index (E.C.). The H-16 cultivar presented the highest grain yield (2,928 kg/ha) but low E.C. (11.9). The triple hybrid ZéLIA-0l had good performance with 22.1 E.C. and l,770 kg/ha. This yi
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