Seleção de progênies de meio-irmãos de milho para eficiência no uso de nitrogênio

Heinz, Rafael; Mota, Leandro Henrique de Sousa; Gonçalves, Manoel Carlos; Neto, Antonio Luiz Viegas; Carlesso, André

doi:10.1590/s1806-66902012000400015

Cited by 9 publications

(6 citation statements)

References 13 publications

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“…Deste modo, a maior eficiência na absorção de nitrato, a partir de baixas concentrações na solução externa, pode ser uma indicação de adaptação das plantas mais eficientes no uso de N às condições de baixo N (COQUE; GALLAIS, 2007 foram 56,07 e 60,41% inferiores às obtidas em baixo N para EUtN e GS, respectivamente, e nula para atividade de NR. Esses resultados são contraditórios aos encontrados em milho avaliado em condições de estresse abiótico, nas quais geralmente as estimativas de herdabilidade, parâmetro semelhante ao coeficiente de determinação genotípica, em baixo N, são inferiores às estimativas obtidas em alto N para produtividade de grãos (HEINZ et al, 2012;PRESTERL et al, 2003;SOARES et al, 2011), caracteres morfológicos da planta (BERTIN; GALLAIS, 2000) e eficiência no uso de N e seus componentes em milho (DoVALE et al, 2012b).…”

Section: Resultsunclassified

Eficiência na absorção e utilização de nitrogênio e atividade enzimática em genótipos de milho

et al. 2013

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RESUMO -O objetivo desse estudo foi investigar o emprego dos componentes da eficiência no uso de nitrogênio e das atividades das enzimas nitrato redutase e glutamina sintetase na seleção de genótipos de milho eficientes no uso de nitrogênio (N). Foram avaliados 10 genótipos de milho em estádio de V4 em condições de alto e baixo N. O experimento foi composto por um fatorial 2 x 10 (dois níveis de N e 10 genótipos de milho) em delineamento inteiramente casualizados com três repetições. Os seguintes caracteres foram avaliados: as eficiências na absorção (EAbN), na utilização (EUtN) e no uso de N (EUsN) e as atividades das enzimas glutamina sintetase (GS) e nitrato redutase (NR). Para os caracteres que o efeito de genótipos foi significativo (p 0,05) na análise de variância por nível de N, as médias foram comparadas por meio do teste t (p 0,05). Os ganhos indiretos na EUsN e em seus componentes com seleção sobre as atividades das enzimas NR e GS foram estimados em baixo N. Conclui-se que em alto N: a EAbN é eficiente para discriminar genótipos de milho eficientes no uso de nitrogênio; em baixo N: as EAbN e EUtN são eficientes para discriminar genótipos de milho eficientes no uso de nitrogênio, a atividade de NR não é um bom parâmetro fisiológico para discriminar genótipos de milho eficientes no uso de nitrogênio, e a seleção sobre atividade da enzima GS possibilita a seleção indireta de genótipos de milho eficientes no uso de nitrogênio.Palavras-chave: Absorção. Utilização. Enzima. Melhoramento genético. Seleção indireta.ABSTRACT -The aim of this study was to investigate the employment of components of the nitrogen efficiency use (NUE), and of the activities of the nitrate reductase and glutamine synthetase enzymes in the selection of nitrogen use efficient maize genotypes of maize. Ten maize genotypes at V4 stage were evaluated under high and low N. The experiment consisted of a 2 x 10 factorial (two levels of N and ten maize genotypes), in a randomized complete block design with three replicates. The following traits were evaluated: N uptake efficiency (NUpE), N utilization efficiency (NUtE) and N use efficiency (NUE), and activities of the glutamine synthetase (GS) and nitrate reductase (NR) enzymes. For traits which the effect of genotype was significant (p 0.05) in the variance analysis for level of N, the mean were compared using the t test (p 0.05). The indirect gains in NUE and their components with selection over the activities of the enzymes NR and GS were estimated under low N. We conclude that: under high N, NupE is efficient to differentiate nitrogen use efficient maize genotypes; under low N, NupE and NUtE efficient to differentiate nitrogen use efficient maize genotypes, the activity of NR enzyme is not a good physiological parameter for differentiate nitrogen use efficient maize genotypes, and selection over activity of GS enzyme enables the indirect selection of nitrogen use efficient maize genotypes.

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Section: Resultsunclassified

Eficiência na absorção e utilização de nitrogênio e atividade enzimática em genótipos de milho

et al. 2013

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“…PATERNIANI et al (2015) obtained low variation index values for most of the traits studied, many of which were also evaluated in this study. HEINZ et al (2012) when studying progenies of half-siblings of corn reported low values only for the traits EL, ED Table 2 -Estimates for genotypic variance (σg 2 ), phenotypic variance (σf 2 ) and the interaction genotype x environment (σ 2 ge), coefficient of heritability (h 2 ), coefficients of genetic variation (CVg), variation index (Iv), means for each trait, selection gain (SG).…”

Section: Traits 1/ --------------------------------------------------------------------Fv------------------------------------------------mentioning

confidence: 99%

Reciprocal recurrent selection for obtaining water-deficit tolerant maize progeny

et al. 2022

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In view of the need to increase genetic variability to obtain materials with a significant capacity to drought tolerance, this study conducted a cycle of a reciprocal recurrent selection of full-sib families of maize. To this end, 64 full-sib families of maize were evaluated in two environments according to their morpho-agronomic data in a randomized block design with two replicates. It were analyzed of Male flowering (MF); Female flowering (FF); Flowering interval (IF); days for flowering (DF); Plant height (PH); Ear height (EH); number of plants at the Stand (NPS); Number of broken plant (NBrP); Number of bedded plants (NBeP); Strawing (St); Ear length (EL); Ear diameter (ED); Ear number (EN); Prolificacy (Pr); Number of diseased ears (NDE); Number of ears attacked by pests (NEP); Ear weight (EW); Yield (YIE) and Total Chlorophyll Index (TCI). The analysis of variance was performed by the F test at 5% significance level, and also the evaluation of genetic parameters. Regarding morpho-agronomic data, the analysis of variance and the analysis of genetic parameters showed that there was no interaction genotype x environment with regard to the genetic variability among the families under study. Lastly, the final selection of the superior genotypes was made on the basis of the ranking of the 40 most productive families, from which, combined with the molecular data, the 30 most productive, most drought-tolerant, and most genetically diverse ones were selected to compose the next cycle of recurrent maize selection aiming water-stress tolerance.

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“…Selection indices have frequently been used for family selection in recurrent selection programs for various crops (Subandi et al, 1973;Rosielle and Frey, 1975;Sharma and Duveiller, 2003;Silva and Vieira, 2008;Sezegen and Carena, 2009;Silva et al, 2009;Heinz et al, 2012;Vivas et al, 2012;Vivas et al, 2013). Although selection indices (Smith, 1936;Hazel, 1943;Williams, 1962;Pešek and Baker, 1969;Mulamba and Mock, 1978) have been used successfully (Santos et al, 2007;Freitas Júnior et al, 2009;Amaral Júnior et al, 2010;Rangel et al, 2011;Ribeiro et al, 2012;Amaral Júnior et al, 2013), these indices contain some limitations.…”

Section: Introductionmentioning

confidence: 99%

Selection index based on the relative importance of traits and possibilities in breeding popcorn

et al. 2016

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ABSTRACT. One of the major difficulties faced by popcorn breeders is the negative correlation between popping expansion (PE) and grain yield (GY). It is necessary to overcome this difficulty to obtain promising genotypes. One helpful tool in this process is a selection index because it allows multiple features of interest to be selected. Thus, the present study proposes a new and comprehensive selection index applied in 169 half-sib families in UEM-Co1 and UEM-Co2 composites during two cycles of recurrent selection. An experiment was conducted in a 13 x 13 lattice square in the 2004/2005 and 2006/2007 crop years in Maringá, Paraná State, and PE and GY were evaluated. To calculate F i statistics, the following relative importance (RI) assignments were used: 0.5 for both PE and GY, and 0.70 and 0.30 for PE and GY, respectively. Families were classified according to F i values such that F i = 0 indicated that genotypes met the average of those selected by direct selection, F i < 0 indicated that genotypes fell below the average of those selected, and Fi > 0 indicated that genotypes exceeded the average of those selected. Thus, desirable values of F i were positive, indicating that the selected families were higher than those families that would be selected by direct selection for both traits. Therefore, we concluded that the novel F i statistic was satisfactory for family selection because simultaneous and higher gains for both traits in both composites were obtained.

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Seleção de progênies de meio-irmãos de milho para eficiência no uso de nitrogênio

Cited by 9 publications

References 13 publications

Eficiência na absorção e utilização de nitrogênio e atividade enzimática em genótipos de milho

Eficiência na absorção e utilização de nitrogênio e atividade enzimática em genótipos de milho

Reciprocal recurrent selection for obtaining water-deficit tolerant maize progeny

Selection index based on the relative importance of traits and possibilities in breeding popcorn

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