EPISTATIC GENE ACTION USING TRIPLE TEST CROSS PROCEDURE IN ZEAMAIZE L

2019 ◽  
Vol 326 (1) ◽  
pp. 75-78
Author(s):  
M. AL-AZAWI NAGHAM ◽  
◽  
E.V. Romanova ◽  
◽  
Keyword(s):  
Gene Action ◽  
Triple Test Cross ◽  
Test Cross ◽  
Triple Test

scholarly journals Relationship Between Combining Ability, Genetic Components And Genetic Diversity Using Triple Test Cross

2020 ◽  
Author(s):  
Yasser Mohamed El-Mansy ◽  
Ahmed Mohamed Abdelmoghny ◽  
Reham. H. A. Gibely ◽  
Adel H. Mabrouk
Keyword(s):  
Genetic Diversity ◽  
Combining Ability ◽  
Gene Action ◽  
Fiber Quality ◽  
Type I ◽  
Cross Model ◽  
Triple Test Cross ◽  
Test Cross ◽  
Genetic Components ◽  
Triple Test

Abstract Background: The target of this study is to investigate the relationship between genetic components, combining ability and genetic diversity among twenty six cotton crosses derived from a cross between thirteen contrasting inbred lines with two testers in three replications using modified triple test cross model.Results: All the genotypes showed highly significant differences for twelve yield and fiber quality traits reflecting genetic variability between lines, testers and crosses. Giza 86 is considered as a good combiner for yield and its components traits, while Giza 45 is the best combiner for fiber fineness and fiber strength, which classified in unique cluster. Most of the combinations having significant SCA effects were belonging to genetically diverse parents. The mean squares for the deviations revealed the presence of significant epistasis for all the studied traits except, seed index and fiber reflectance. While, significant mean squares were shown for sums and differences except lint index for additive and uniformity ratio and fiber reflectance for dominance. The fixable type (i) of epistasis was larger than non-fixable (i + l) type for the inheritance of the studied traits. The traits had significant mean squares for both fixable and non-fixable gene action, also showed significant GCA and SCA among 15 parents and 26 cotton crosses, respectively. Additive genetic component was larger than dominance for all the studied traits. So, most of the studied traits had significant GCA and degree of dominance was less than unity for all the studied traits, indicating partial or incomplete dominance. The correlation coefficient between the sums and difference were found to be insignificant indicating the genes with positive and negative effects were equally distributed among the genotypes.Conclusions: Genetic correlation between three genetic components revealed that both additive and epistasis play a great role among some studied traits suggesting common genetic pool. Thus, selection based on additive gene action based on indirect selection could improve cotton yield. The genotypes which have large genetic diversity could produce significant general or specific combining ability which may be reflecting its genetic behavior.

scholarly journals Epistasia para a produção de grãos em soja

Bragantia ◽  
2009 ◽  
Vol 68 (2) ◽  
pp. 313-318 ◽  
Author(s):  
Marco Antonio Acevedo Barona ◽  
José Manoel Colombari Filho ◽  
Isaias Olivio Geraldi
Keyword(s):  
Glycine Max ◽  
Triple Test Cross ◽  
Test Cross ◽  
Triple Test ◽  
Glycine Max L

Em soja [Glycine max (L.) Merrill], a produção de grãos é o caráter de maior importância econômica, com herança quantitativa e altamente influenciado pelo ambiente. As estratégias de seleção utilizadas para o desenvolvimento de cultivares em soja poderiam ser otimizadas por meio do estudo da importância relativa dos componentes de variância, particularmente a proporção de variação devida às interações não alélicas (epistasia). Com o objetivo de estudar a variação epistática para a produção de grãos em soja utilizou-se o delineamento "Triple Test Cross Modificado" (TTC) de Jinks et al. Uma amostra de 32 linhas puras (Pi) derivadas de um cruzamento biparental foi cruzada com duas linhagens divergentes (L1 e L2) contrastantes para PG, derivadas da mesma população. O experimento de avaliação foi desenvolvido no ano agrícola de 2006/2007 em um delineamento em látice triplo triplicado (9 repetições), contendo 100 tratamentos: 32 cruzamentos Pi x L1 (L1i), 32 cruzamentos Pi x L2 (L2i), 34 linhas puras (32 Pi mais dois testadores) e duas testemunhas comerciais. A variação entre os contrastes de médias (L1i + L2i - Pi) foi altamente significativa na análise de variância (P<0,01), indicando a ocorrência de epistasia. Os resultados gerais indicam, portanto, que a epistasia pode ser um componente importante para a expressão da produção de grãos de soja e, consequentemente, esta deve ser incluída nos modelos para a decomposição dos componentes da variância genética.

The assessment of genetic variation from normal, self and backcross families of a triple test cross of pure-breeding lines in wheat

1986 ◽  
Vol 106 (1) ◽  
pp. 1-6 ◽  
Author(s):  
D. S. Virk ◽  
Parminder S. Virk
Keyword(s):  
Genetic Variation ◽  
Bread Wheat ◽  
Weighted Least Squares ◽  
Model Fitting ◽  
Plant Weight ◽  
Breeding Lines ◽  
Triple Test Cross ◽  
Test Cross ◽  
Triple Test ◽  
Allelic Interaction

SUMMARYNormal, self and backcross families in a triple test cross were used to investigate the inheritance of number of days from sowing to flowering and dry plant weight for a population of pure-breeding lines of bread wheat (Triticum aestivum L.). Several tests of non-allelic interaction, additive genetic and dominance variances were made that involved triple test cross and single tester analyses. Non-allelic interaction was found to be a component of the genetic variation for both traits. The additive and dominance variances were prevalent for both traits. Alternative estimates of additive genetic and dominance variance components did not differ significantly when tested by a weighted least-squares model fitting procedure. The results are discussed in relation to genetic improvement of bread wheat.

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