scholarly journals Revelation of Epistasis through Triple Test Cross (TTC) Analysis in Rice (Oryza sativa L.)

2021 ◽  
Author(s):  
J. Johnny Subakar Ivin ◽  
Y. Anbuselvam ◽  
Maddi sivakumar ◽  
M. Surendhar ◽  
S. Keerthana
Keyword(s):  
Oryza Sativa L ◽  
Block Design ◽  
Components Of Variance ◽  
Triple Test Cross ◽  
Test Cross ◽  
Study Materials ◽  
Triple Test ◽  
Panicle Number ◽  
Wide Range ◽  
The Difference

Background: An investigation was performed to identify epistasis, additive, dominance components of genetic variation and yield and yield variability attributing characteristics by triple test cross testing involving three testers (P1, P2 and F1) and ten rice lines.Methods: The study materials consisted of F1 seeds of three crosses, involving six parents namely, ASD16, ADT47, ASD18, CO51, TKM9 and MTU 7029. They are evaluated in randomized complete block design with three replications. Observations were reported for seven traits, namely plant height, number of tillers per plant, number of productive tillers per plant, length of panicle, number of grains per panicle, weight of 1000 grains and yield of grain per plant on five randomly selected plants per replication.Result: The segregating population of three crosses exhibited wide range of variability for most of the traits. The difference between GCV and PCV was low for most of the characters indicated less influence of environment. Among the three crosses ASD18 x CO15 recorded high percent of heritability and genetic advance for grain yield per plant. The estimate of total epistasis revealed that i type of epistasis (additive x additive) was highly significant for number of tillers per plant, number of productive tillers per plant, panicle length and 1000 grain weight. The effect of the additive (D) variance was very important for all the traits except the number of grains per panicle. Across all traits, the degree of dominance (H / D)1/ 2 was less than unity ( less than 1) suggesting, partial of dominance. Since, the pre dominance component of epistasis in autogamous crop is additive x additive (i type), it was suggested that the selection may be post ponded to later generation until all the non-additive components of variance has been mitigated to additive components.

TRIPLE TEST CROSS ANALYSIS IN FOUR SESAME CROSSES (SESAMUM INDICUM L.) 2. YIELD, YIELD COMPONENTS AND WILT INFECTION

2001 ◽  
Vol 48 (4) ◽  
pp. 363-671 ◽  
Author(s):  
B. R. Bakheit ◽  
A. A. El-Shiemy ◽  
F. S. Sedek ◽  
A. A. Ismail
Keyword(s):  
Seed Yield ◽  
Yield Components ◽  
Seed Weight ◽  
Block Design ◽  
Gene Effects ◽  
Partial Dominance ◽  
Triple Test Cross ◽  
Test Cross ◽  
Triple Test ◽  
Oil Percentage

The present study was carried out during the three successive growing seasons of 1996, 1997 and 1998 to estimate the additive, dominance and epistatic components of genetic variation for the yield, yield components and wilt infection by using ninety triple test cross families and their parents, F1 and F2 in four sesame crosses. A randomized complete block design with three replications was used. The results indicated that mean squares of the genetic analysis of variance and the overall epistatic gene effects for the crosses showed highly significant differences for all studied characters. The [i] type (additive × additive) was considered as a major component of the overall epistatic effects for 1000-seed weight in the TTC3 cross, wilt infection percentage in TTC3 and TTC4, number of capsules/plant in TTC1, TTC2 and TTC4 and seed yield/plant in all crosses. The ratio of (H/D)1 for all crosses confirms the presence of partial dominance for all studied traits. The direction of dominance was positive and significant for wilt infection in TTC4, oil percentage in TTC1 and TTC4, number of capsules/plant and 1000-seed weight in TTC2 and seed yield/plant in all four crosses. The results also revealed that the highest proportion of recombinant lines was obtained for number of capsules/plant, 1000-seed weight and oil percentage in the TTC2 cross and for seed yield/plant in TTC3.

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.

Triple test cross analysis in three barley populations under saline-alkali soil conditions

1983 ◽  
Vol 101 (2) ◽  
pp. 317-321 ◽  
Author(s):  
I. D. Tripathi ◽  
M. Singh
Keyword(s):  
Plant Height ◽  
Block Design ◽  
Soil Conditions ◽  
Cross Combination ◽  
Gene Effects ◽  
Triple Test Cross ◽  
Test Cross ◽  
Alkali Soil ◽  
Triple Test ◽  
Randomized Block Design

SUMMARYOne hundred and eighty triple test cross families arising from three barley crosses (C 164 x EB 1556, BG 25 x NP 21 and BH 15 x RD 103) were grown in two blocks of a randomized-block design in saline-alkali soil prepared in micro-plots. The families were evaluated for number of days from sowing to heading, plant height, number of tillers per plant, ear length, number of grains per ear, 100-grain weight and grain yield per plant. The cross BG 25 x NP 21 showed epistasis only for number of days toheading and number of grains per ear; in contrast, epistasis was present in all traits in BH 15 x RD 103. In cross C 164 x EB 1556, epistasis was detected for plant height, ear length and number of grains per ear. Thus, epistasis appears to be related to specific cross combination. The ‘j and l’ type epistasis was more pronounced than the ‘i’ type. Early generation selection may be used for number of days to heading which Exhibited epistasis marginally with preponderance of additive gene effects, while for the remaining traits selection should be deferred till an advanced generation.

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.

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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