General vs. Specific Combining Ability in Single Crosses of Corn<sup>1</sup>

Sprague, G. F.; Tatum, L. A.

doi:10.2134/agronj1942.00021962003400100008x

Cited by 1,070 publications

(837 citation statements)

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“…As análises de CEC estão relacionadas com a distância genética entre os progenitores e evidenciam a importância de interações não aditivas, caracterizadas pela complementaridade em relação à freqüên-cia dos alelos nos locos com alguma dominância entre os genitores. Altos valores positivos ou negativos indicam que o desempenho de algumas combinações híbridas são relativamente superiores ou inferiores ao que seria esperado com base na média dos parentais envolvidos (Sprague & Tatum, 1942).…”

Section: Glunclassified

Potencial discriminatório de três testadores em "topcrosses" de milho

Duarte

Ferreira

Nuss³

2003

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi determinar o potencial de três testadores endogâmicos elites a fim de avaliar e classificar 15 materiais genéticos para a síntese de híbridos. Quarenta e cinco híbridos mais quatro testemunhas foram avaliados em cinco ambientes, no ano agrícola 2000/2001, utilizando delineamento em blocos ao acaso, com três repetições. Foram avaliados os caracteres peso de grãos corrigido, altura de planta e altura de espiga. As estimativas de capacidade geral e específica de combinação foram obtidas pelo modelo de Griffing, adaptado por Vencovsky e Barriga, para análise em delineamento genético fatorial. O rendimento médio obtido entre os cinco ambientes variou de 8,97 t ha -1 a 12,21 t ha -1 . Vinte e sete tratamentos superaram a média geral absoluta da melhor testemunha. A análise de variância conjunta revelou efeitos significativos de ambientes, capacidade geral de combinação dos parentais e testadores, capacidade específica de combinação e das interações ambiente x capacidade geral de combinação dos parentais e testadores. Os testadores promoveram uma classificação diferenciada para a base genética avaliada, com destaque para os cruzamentos entre parentais HS1, HS2, HS5 e HT4 com o testador LF e parentais L10 e HS5 com o testador L05.Termos para indexação: Zea mays, progênie, híbrido, capacidade combinatória, germoplasma. Screening potential of three maize topcross testersAbstract -The objective of this work was to assess the potential of three elite inbred testers to evaluate and rank fifteen genetic materials for hybrid synthesis. Forty-five hybrids and four controls were evaluated in five different environments in the 2000/2001 growing season using a randomized complete block design with three replications. The main agronomic traits were assessed, including the corrected grain yield and plant and ear height. Estimates of general and specific combining ability were obtained using Griffing's method adapted by Vencovsky and Barriga. The average yield in the five environments ranged from 8.97 ton ha -1 to 12.21 ton ha -1 . Twenty seven treatments outperformed the mean yield of the best control. The analysis of variance over environments revealed significant main effects of environments, general combining ability of the parents and testers, specific combining ability and significant interactions, such as environment x general combining ability of parents and also environment x general combining ability of testers. The testers allowed ranking and screening of the assessed genetic basis, suggesting as best combinations the crosses that included the HS1, HS2, HS5 and HT4 parents with the LF tester and the L10 and HS5 parents with the L05 tester.

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Section: Glunclassified

Potencial discriminatório de três testadores em "topcrosses" de milho

Duarte

Ferreira

Nuss³

2003

Pesq. agropec. bras.

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“…It should be pointed Out that g is not general combining ability as defined by Sprague and Tatum (1942), nor does fit their definition of specific combining ability, for they defined these effects as deviations from the mean of the F1's. In this paper, these effects are deviations from the weighted mean of the p inbreds and the p(p -i) crossbreds.…”

Section: Statistical Design and Linear Models (I) Designmentioning

confidence: 99%

Alternative analyses of the diallel cross

Wearden

1964

Heredity

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“…Fifteen sweet corn hybrids were developed from a half-diallel of six historic inbreds, estimating the general combining ability (GCA) and specific combining ability (SCA) for traits of interest. As defined by Sprague and Tatum [24], GCA refers to the "average performance of a line in hybrid combination", and SCA represents "those cases in which certain combinations do relatively better or worse than would be expected on the basis of the average performance of the lines involved". These results will enable future breeding to focus on improving sweet corn for increased density tolerance and weed suppressive ability.…”

Section: Introductionmentioning

confidence: 99%

Genetic Variation and Phenotypic Response of 15 Sweet Corn (Zea mays L.) Hybrids to Population Density

Shelton

Tracy

2013

Sustainability

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Abstract:Planting sweet corn at higher densities may increase the canopy cover, reducing light transmission to the understory and suppressing weed growth. High planting densities can also negatively impact the crop, however, by decreasing ear size and overall yield. The objective of this study was to determine the potential for increased density tolerance of 15 sweet corn hybrids by estimating the general combining ability (GCA) and specific combining ability (SCA) for traits of interest. In 2010 and 2011, a half-diallel of six historic sweet corn inbreds was evaluated in a split-block randomized complete block design in four Wisconsin environments, with four replicates in each environment. Hybrids were planted at a low density of 29,936 plants ha −1 , a medium density of 63,615 plants ha −1 , and a high density of 97,293 plants ha −1 . Significant differences between hybrids were found for phenomorphological traits and ear characteristics. Inbreds C68, C40 and Ia5125 produced the progeny most tolerant of the highest population density. Among these genotypes, tolerance to high density is a heritable trait, indicating the feasibility of breeding sweet corn for density tolerance and potential weed competitiveness.

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General vs. Specific Combining Ability in Single Crosses of Corn¹

Cited by 1,070 publications

References 1 publication

Potencial discriminatório de três testadores em "topcrosses" de milho

Potencial discriminatório de três testadores em "topcrosses" de milho

Alternative analyses of the diallel cross

Genetic Variation and Phenotypic Response of 15 Sweet Corn (Zea mays L.) Hybrids to Population Density

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General vs. Specific Combining Ability in Single Crosses of Corn1

Cited by 1,070 publications

References 1 publication

Potencial discriminatório de três testadores em "topcrosses" de milho

Potencial discriminatório de três testadores em "topcrosses" de milho

Alternative analyses of the diallel cross

Genetic Variation and Phenotypic Response of 15 Sweet Corn (Zea mays L.) Hybrids to Population Density

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Product

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General vs. Specific Combining Ability in Single Crosses of Corn¹