Genetic Enhancement of Semi-Exotic Maize Germplasm

Filho, J. B. Miranda; Reis, Edésio Fialho dos

doi:10.18512/1980-6477/rbms.v15n2p346-356

Cited by 2 publications

(2 citation statements)

References 7 publications

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“…A work developed by Miranda Filho and Reis (2016), with several levels of exotic germplasm involving five subsets of populations, three of tropical origin and two of temperate origin, indicated good performance for yield (weight of spikes), the average of three sets of tropical origin of 79.5; 74.4 and 76.3% of the control and an average of the two sets of temperate origin of 72.7 and 71.3% of the control.…”

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Genetic Variability and Expected Gain in Three Maize Populations

Souza

Filho²,

Oliveira

et al. 2018

RBMS

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- The study of genetic variability in populations undergoing recurrent selection is important to quantify their real potential for breeding purposes. In the present work, three semiexotic maize populations were evaluated on their yield potential and variability for continuing the recurrent selection program. Half-sib families representing three semiexotic populations CRE-01, CRE-02, CRE-03 were evaluated for yield and agronomic traits male flowering (MF), plant height (PH), ear height (EH), ear placement (EP) - ratio = (EH/PH), tassel length (TL), tassel branches (TN), final stand (FS), ears per plot (NE), prolificacy (PR), ear length (EL), ear diameter (ED), ear yield (EY), grain yield (GY). The observed means for grain yield (GY), in percent of the hybrid check, were 93.8%, 89.4%, and 94.6%, showing a relatively good yield potential. Means (cm) for plant height (PH) and ear height (EH) were 221, 237, 241 and 117, 134, 137, respectively, with reductions in relation to the first cycle. Parameters estimates for GY were: additive genetic variance 582.28, 406.70 and 238.11 g2.plant-1; heritability 59.17%, 49.82% and 38.53%; progeny mean basis, and expected gain for progeny selection 8.16%, 6.86% and 3.88%; selection intensity of 20%.Keywords: Zea mays, recurrent selection, semiexotic population, genetic parameters.VARIABILIDADE GENÉTICA E GANHO ESPERADO EM TRÊS POPULAÇÕES DE MILHORESUMO - O estudo da variabilidade genética em uma população sob seleção é importante para quantificar seu potencial para fins de melhoramento. No presente trabalho foram avaliadas três populações semiexóticas de milho quanto ao seu potencial de produção e de variabilidade para continuar o programa de seleção recorrente em curso. Famílias de meios irmãos representando as três populações (CRE-01, CRE-02, CRE-03) foram avaliadas para caracteres agronômicos florescimento masculino (MF), altura da planta (PH), altura da espiga (EH), posição relativa da espiga (EP), comprimento do pendão (TL), ramificações do pendão (TN), estande final (FS), espigas por parcela (NE), prolificidade (PR), comprimento da espiga (EL), diâmetro da espiga (ED), peso de espiga (EY), peso de grãos (GY). As médias observadas para produção de grãos (GY) foram 93,8%, 89,4% e 94,6% da testemunha, mostrando um bom potencial de produção. As alturas médias da planta (PH) foram 221, 237 e 241 cm e da espiga (EH) foram 117, 134 e 137 cm, com reduções em relação ao primeiro ciclo. As estimativas de parâmetros para GY nas três populações foram, respectivamente: variância genética aditiva 582,28 g2 planta-1, 406,70 g2 planta-1 e 238,11 g2 planta-1; coeficiente de herdabilidade em média de progênies 59,17%, 49,82% e 38,53% e ganho com seleção para 20% de intensidade de 8,16%, 6,86% e 3,88%; ganho com seleção para 5% de intensidade de 10,81%, 10,47% e 5,32%, respectivamente para as populações CRE-01, CRE-02 e CRE-03.Palavras-chave: Zea mays L., seleção recorrente, população semiexótica, parâmetros genéticos.

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Genetic Variability and Expected Gain in Three Maize Populations

Souza

Filho²,

Oliveira

et al. 2018

RBMS

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“…Obtaining and evaluating inbred lines is the costliest and most time consuming step in any maize hybrids development program (Miranda Filho and Viégas 1987). One way to speed up the process and reduce program costs is by obtaining top-cross hybrids from partially inbred lines.…”

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Selection of maize top-crosses for different nitrogen levels through specific combining ability

et al. 2019

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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 topcrosses under high and low nitrogen (N) conditions and to select highyielding 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 PLANT BREEDING -Article of the individual top-cross analyses. Specific combining ability (SCA)of the hybrids and their interaction with N levels was estimated for each location. The mean grain yield of the 11 hybrids selected by the highest SCA estimates for high and low N was higher than the controls mean in approximately 330 and 241 kg•ha -1 . These results demonstrate that the selection for each environment was efficient and reveals the possibility of developing new hybrids for the Brazilian Cerrado region.

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Genetic Enhancement of Semi-Exotic Maize Germplasm

Cited by 2 publications

References 7 publications

Genetic Variability and Expected Gain in Three Maize Populations

Genetic Variability and Expected Gain in Three Maize Populations

Selection of maize top-crosses for different nitrogen levels through specific combining ability

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