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.

Triple test cross analysis in first backcross populations of four wheat crosses

1978 ◽  
Vol 91 (2) ◽  
pp. 505-508 ◽  
Author(s):  
S. Singh ◽  
R. B. Singh
Keyword(s):  
Genetic Variation ◽  
Plant Height ◽  
Kernel Weight ◽  
The Other ◽  
Triple Test Cross ◽  
Test Cross ◽  
Triple Test ◽  
Additive Component ◽  
Backcross Populations ◽  
Metric Traits

SUMMARYThe triple test cross analysis (Kearsey & Jinks, 1968; Jinks & Perkins, 1970) was used to detect and estimate the additive, dominance and epistatic components of genetic variation for four metric traits, namely, final plant height, number of spikelets per spike, 100-kernel weight and yield per plant, in the first backcross populations of four wheat crosses (Norteno 67 α Moti, Sonalika α Moti, Kalyan Sona α Sonalika and Kalyan Sona × NP 876). Epistasis was a more important component of variation for final plant height and yield per plant than for number of spikelets per spike and 100-kernel weight. On the other hand, the additive component was highly significant for all four characters in all eight backcrosses.

Estimation of additive and dominance components through triple test cross in wheat

1985 ◽  
Vol 105 (1) ◽  
pp. 123-128
Author(s):  
I. Singh ◽  
R. S. Paroda ◽  
S. Singh
Keyword(s):  
Genetic Variation ◽  
Grain Yield ◽  
Block Design ◽  
Total Biomass ◽  
Triple Test Cross ◽  
Test Cross ◽  
Triple Test ◽  
Randomized Block Design ◽  
Additive Component ◽  
1000 Grain Weight

SUMMARYForty-five triple test cross progenies produced by crossing 15 homozygous strains of wheat with three testers (varieties HD 2160 and NP 846 and their F1) and 17 parents, were raised in a randomized-block design in two environments (normal and stress). The data on five randomly chosen plants from parents and F8 and ten plants from F1 x lines were recorded for number of days from sowing to heading, plant height, the number of tillers per plant, total biomass, the number of grains per ear, 1000·grain weight and grain yield per plant. The additive and dominance components of genetic variation were each estimated by three methods to determine their relative usefulness in estimating these components. The variance of parents gave better estimates of the additive component than the two other methods (1i + 2i and 1i + 2i + 3i). The method 1i + 2i + 3i proved its superiority over the 1i + 2i method. The dominance component was better estimated by the method 1i - 2i than by the 4σ2d + 9σ2 (1i + 2i - i) and 25 (σ2 (21i - i) pooled with σ2 (22i - i)) methods. The two methods 4σ2d + 9σ2 (1i + 2i - i) and 25 (2σ2 (21i - i) pooled with σ2 (22i - i)) provided similar results for the estimation of dominance component.

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 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.

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