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.

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 COMBINING ABILITY IN RELATION TO HETEROSIS EFFECTS AND GENETIC DIVERSITY IN COTTON USING LINE X TESTER MATING DESIGN

2021 ◽  
Vol 21 (No.1) ◽  
Author(s):  
Max Mariz ◽  
Reham Gibely ◽  
Abdelmoghny AM
Keyword(s):  
Genetic Diversity ◽  
Combining Ability ◽  
Gene Action ◽  
Fiber Strength ◽  
Fiber Quality ◽  
Block Design ◽  
Specific Combining Ability ◽  
Lint Yield ◽  
Gene Effects ◽  
Additive Gene

The aim of this study was to investigate the relationship between specific combining ability, genetic diversity of parents and heterosis over better parent effects. This research, having eighteen F1 crosses derived from crossing between six lines and three testers, was conducted in order to estimate combining ability, to determine the nature of gene action and heterosis for yield and fiber quality traits and to detect the appropriate crosses for cotton breeding program. The experiment was conducted on randomized complete block design with three replications. The analyses of variance showed significant differences among the genotypes, parents (lines and testers) and crosses for all the studied traits. Estimates of both general and specific combining ability effects were significant for most traits, indicating the importance of both additive and non-additive gene effects for these traits. While, specific was higher than general combining ability variances, for all traits, showing non-additive gene action controlling and therefore, heterosis breeding may be rewarding. The heterosis value varied from cross to cross and from trait to trait. This dissimilarity coefficient was ranged from 3.234 between Giza 85 and Giza 80 to 71.002 between Giza 96 and 10229. Association between heterosis over better parent and specific combining ability was positive and significant for all the studied traits except lint yield / plant. No correlations were found between SCA and GD for all the studied traits. Similarly, heterosis effects was negatively significantly correlated with GD only in the case of boll weight, lint yield / plant and uniformity ratio %, while showed positive and significant correlation for fiber strength and micronaire value. Four crosses showed both positive and significant heterosis and specific combining ability for most yield traits. The parents of these crosses belong to different clusters. Crossing diverse parents could produce high heterotic performance in hybri

Triple test cross and six-population techniques for partitioning the components of genetic variance in faba bean (Vicia faba)

2002 ◽  
Vol 139 (1) ◽  
pp. 61-66 ◽  
Author(s):  
B. R. BAKHEIT ◽  
M. Z. EL-HIFNY ◽  
M. M. EISSA ◽  
S. B. RAGHEB
Keyword(s):  
Faba Bean ◽  
Genetic Architecture ◽  
Genetic Variance ◽  
Triple Test Cross ◽  
Test Cross ◽  
Plant Seeds ◽  
Genetic Components ◽  
Triple Test ◽  
Flower Plant ◽  
100 Seed Weight

The efficiency of the triple test cross (TTC) and the six-population biometrical analyses was compared in terms of assessing and quantifying the components of genetic variance for two faba bean crosses: Triple White×Giza 843 and NA112×Giza 429. Several traits were studied including days to first flower, plant height, branches/plant, pods/plant, seeds/pod, 100-seed weight and seed yield/plant. The results supported the triple test cross biometrical approach as it uses first degree statistics and can be applied to any population irrespective of its genetic architecture. Absence of a scalar relationship between triple test cross families (orthogonality) ensures independence between means and variance with no restrictive assumptions. Both methods provided evidence for epistasis, and both additive and dominance genetic components in the genetic control of the studied traits.

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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