DIALLEL ANALYSIS OF ROUGH BLOSSOM-END SCARRING IN TOMATO

A half diallel including 11 parents was conducted under high temp. conditions in Florida and low temp. conditions in Israel. Blossom scar (BS) size was measured relative to the fruit size for 20 mature fruits per plot. Griffing's analysis showed that both GCA and SCA effects were highly significant at both locations (p< 0.0001). Analysis according to Hayman indicated no epistatic effects. In both environments, additive and dominant gene action was significant (p < 0.0005), although the additive gene effects were most important. Averaged over all loci, the incomplete dominance was in the direction of small BS. Narrow sense heritability estimates were 0.62 and 0.57 for Florida and Israel, respectively. Combined analysis showed that the genetic system was unstable over the 2 environments, as both additive and dominant gene effects interacted significantly with environment (p < 0.0001). The implication for breeding programs is that hybrid performance should be tested at several locations to insure stability of small BS.

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Evaluating Genetic Parameters and Combining Ability of Starch Viscosity Parameters in Rice Cultivars (Oryza sativa L.)

Turkish Journal of Agriculture - Food Science and Technology ◽

10.24925/turjaf.v7i4.665-671.2358 ◽

2019 ◽

Vol 7 (4) ◽

pp. 665

Author(s):

Alireza Haghighi Hasanalideh ◽

Mehrzad Allahgholipour ◽

Ezatollah Farshadfar

Keyword(s):

Combining Ability ◽

Gene Action ◽

Oryza Sativa L ◽

Block Design ◽

Breeding Methods ◽

Narrow Sense ◽

Narrow Sense Heritability ◽

Gene Effects ◽

Diallel Mating Design ◽

Additive Gene

This study was undertaken to assess the combining ability of 6 rice varieties, for viscosity parameters and determining gene action controlling Rapid Visco Analyser (RVA) characters. F2 progenies derived from a 6×6 half diallel mating design with their parents were grown in a randomized complete block design with three replications at the research farm of Rice Research Institute of Iran (RRII) in 2015. The diallel analysis by Griffing`s method indicated the involvement of additive and non-additive gene actions controlling RVA traits. For traits PV and FV RI18447-2 and IR50 were the best combiners for increasing and decreasing, respectively. Deylamani and IR50 were the best combiners for increasing and decreasing BV, respectively. Beside, due to more portion of non-additive gene action in controlling trait SV, The Gilaneh × RI18430-46, and Deylamani × RI18430-46 crosses were the best for increasing and decreasing SV, respectively. The high estimates of broad sense heritability and narrow sense heritability for BV and FV, indicated the importance of additive effects in expression of these traits. Therefore, selection base breeding methods will be useful to improve these traits and selection in the early generations could be done to fix the favourable genes. Low estimate of narrow sense heritability for SV revealed that non-additive gene effects play important role in controlling setback viscosity. So, hybrid base breeding methods will be useful to improve this trait.

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DETERMINATION HETEROSIS,COMBINING ABILITY AND GENE ACTION USING HALF DIALLEL CROSSES IN MAIZE.

IRAQI JOURNAL OF AGRICULTURAL SCIENCES ◽

10.36103/ijas.v49i6.127 ◽

2018 ◽

Vol 49 (6) ◽

Author(s):

Hammadi & abed

Keyword(s):

Combining Ability ◽

Gene Action ◽

Diallel Analysis ◽

Kernel Weight ◽

Specific Combining Ability ◽

Analysis Method ◽

Degree Of Dominance ◽

Additive Gene ◽

Hybrid Art ◽

Half Diallel

Six inbred lines of maize were crossed in this study by using half – diallel analysis method , during spring season of 2017, to produce fifteen F1 crosses. The parents and crosses were cultivated during fall season of 2017 by using R.C.B.D with three replications to determine heterosis, general and specific combining ability effects and gene action . Significant differences were found among parental and their crosses for all the traits . The results were showed that the hybrid ( Zm - 1× Zm - 5) had the highest heterosis in grain yield.plant-1 (113.4%). The hybrid (ART-B-17x SYN-33) produced highest number rows. ear-1 (17.9) rows, 500 kernel weight (112.9) gm and grain yield.plant-1 (214.7) gm . The values of specific combining ability variances were more than the general combining ability variances for all the traits, indicating that non-additive gene action was responsible for inheritance of all the traits. The values of the broad sense heritability for all characters were higher and average degree of dominance was exceeded one for all the traits . Results indicated that some inbreds could be used in breeding program to develop single crosses which have higher grain yield because all the traits under over dominance gene action

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482 PB 414 A COMPARISON OF Pseudomonas solanacearum-RESISTANT TOMATO CULTIVARS AS HYBRID PARENTS

HortScience ◽

10.21273/hortsci.29.5.500d ◽

1994 ◽

Vol 29 (5) ◽

pp. 500d-500

Author(s):

William G. Gonzalez ◽

William L. Summers

Keyword(s):

Dominant Gene ◽

Transmitted Disease ◽

Fruit Size ◽

Pseudomonas Solanacearum ◽

Gene Effects ◽

Virulent Strains ◽

Small Fruit ◽

Indeterminate Growth Habit ◽

Race 1 ◽

Additive Gene

Seven tomato lines and their 21 hybrid populations were evaluated for their ability to resist infection by 7 virulent strains of Pseudomonas solanacearum representing race 1 biovars 1 and 3. In all cases the Gardner and Eberhart model III analysis found GCA values to be significant. In 5 of 7 cases SCA was significant. In 4 cases the parent vs. cross contrast was significant. We conclude that resistance to Pseudomonas solanacearum is predominantly controlled by additive gene action and to a lesser degree by dominant gene effects. Hawaii 7998 was found to be resistant to all 7 strains, while Rotam 4 and Rodade were resistant to biovar 3 and one race of biovar 1 (UW 275). Venus and Saturn were resistant to 3 other biovar 1 strains. Hawaii 7998 transmitted disease resistance better than the other resistant parents but its small fruit size and indeterminate growth habit make it a poor choice for a hybrid parent.

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Generation Mean Analysis for Yield and Its Component Traits in Diallel Population of Cotton (Gossypium hirsutum L.)

Indian Journal of Agricultural Research ◽

10.18805/ijare.a-5639 ◽

2020 ◽

Author(s):

Jaya Parkash Yadav ◽

R. K. Giri ◽

S. K. Verma

Keyword(s):

Gossypium Hirsutum ◽

Gene Action ◽

Dominant Gene ◽

Genetic Advance ◽

Cotton Yield ◽

Generation Mean Analysis ◽

Seed Cotton ◽

Narrow Sense Heritability ◽

Gene Effects ◽

Seed Cotton Yield

Background: The nature and magnitude of gene action decides the choice of breeding procedure for achieving desired genetic improvement in any crop. It is particularly important to have an idea of gene interactions for getting genetic advance for polygenic traits such as yield and fiber traits in cotton. Method: The current study was undertaken to investigate the gene action controlling yield and components traits in eight Gossypium hirsutum varieties by using means of the six generations (P1, P2, F1, F2, BC1 and BC2) of 8 x 8 diallel crossing program. The mean of the crosses for the traits in each generation were used for generation mean analysis. Conclusion: Results revealed that the estimated mean effects (m) were highly significant for all traits, indicating quantitative inheritance of these traits. Out of the seven traits under study five traits showed significance for at least one scaling test. Additive and dominant gene effects were significant for seed cotton yield and number of monopods with larger magnitude of dominance effects than additive ones. Dominance, additive x dominance and dominance x dominance were significant for boll weight, number of monopods, seed cotton yield and seed index. Narrow-sense heritability and genetic advance were found low for most of the traits.

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Inheritance of polyembryony in flax (Linum usitatissimum)

Canadian Journal of Genetics and Cytology ◽

10.1139/g83-023 ◽

1983 ◽

Vol 25 (2) ◽

pp. 117-121 ◽

Cited By ~ 9

Author(s):

A. G. Green ◽

P. A. Salisbury

Keyword(s):

Linum Usitatissimum ◽

Gene Action ◽

Doubled Haploid Line ◽

Genetic System ◽

Transgressive Segregation ◽

Additive Gene Action ◽

Narrow Sense Heritability ◽

Line Production ◽

Linum Usitatissimum L ◽

Additive Gene

The inheritance of polyembryony (haploid–diploid twin seedlings) in the cross between Linum usitatissimum L. cv. Avantgarde (zero twinning) and cv. Rocket 4 (6.6% twins) was examined. It was concluded that the production of polyembryonic seeds is controlled mainly by additive gene action, with a realized narrow-sense heritability of 0.8. The frequency of twinning in the F2 generation displayed substantial transgressive segregation, ranging from zero to 32.0%. It was considered that such transgression could be due to either the presence of residual heterogeneity for twinning alleles in cv. Rocket 4, or the existence of a genetic system suppressing the expression of twinning alleles in cv. Avantgarde. The occurrence of a genotype producing haploid plants from more than 30% of its seeds should enable the efficiency of doubled-haploid line production to be greatly improved, and also lead to a better understanding of the embryological origins of the haploid component of polyembryonic seeds.

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Genetic Analysis of Fruit Yield and its Components in Bottle Gourd [Lagenaria siceraria (Mol.) Standl.]

Indian Journal of Agricultural Research ◽

10.18805/ijare.a-5820 ◽

2021 ◽

Author(s):

J.R. Balat ◽

J.B. Patel ◽

I.R. Delvadiya ◽

A.V. Ginoya

Keyword(s):

Gene Action ◽

Fruit Yield ◽

Bottle Gourd ◽

Narrow Sense Heritability ◽

Gene Effects ◽

Genetic Components ◽

Equal Importance ◽

Additive Gene ◽

Genetic Assessment ◽

Criteria For Selection

Background: The choice of parents to be incorporated in hybridization is a crucial step for breeders for the improvement of complex quantitative characters, such as fruit yield and its components. It requires extensive and detailed genetic assessment of existing germplasm and newly developed promising lines. The magnitude and type of gene action serves as criteria for selection of parents, which after hybridization are likely to produce the best recombinants for desirable traits. Methods: Forty five bottle gourd genotypes comprising 36 hybrids and 9 parents were evaluated in four different environments. Genetic components of variation were estimated for 12 different characters including fruit yield per plant. Result: The additive as well as dominant components were significant for fruit yield per plant and its components, revealing equal importance of both additive as well as non-additive gene effects. However, fruit yield per plant is under the control of dominance variance. Over dominance type of gene action, considerable degree of gene symmetry over all the loci, excess of dominant alleles in parents and high narrow sense heritability was found for most of the traits studied.

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Gene action, heterosis and combining ability studies for economic traits in diallel crosses of lentil (Lens culinaris Medikus).

Agricultural Science Digest - A Research Journal ◽

10.18805/ag.d-4749 ◽

2019 ◽

Vol 38 (4) ◽

Author(s):

Mamta Gautam ◽

K.K. Gautam ◽

R.K. Panwar ◽

S.K. Verma

Keyword(s):

Lens Culinaris ◽

Gene Action ◽

Diallel Analysis ◽

Economic Traits ◽

Gene Effects ◽

Single Cross ◽

Component Traits ◽

Additive Gene ◽

Standard Heterosis ◽

Maximum Expression

Diallel analysis was used to understand the nature of gene effects to determine the nature, magnitude and direction of heterosis and to identify promising single cross based on mean performance, heterosis, GCA and SCA effect and to dissect the kind of gene action governing the economic traits in lentil. Eight lentil parents and their 28 F1S (excluding reciprocals) along with 2 checks were evaluated. Among parents, investigation of highest gca effects illustrated that PL 406 and L 4188 were good general combiners for most of yield. Cross PL 7 x PL 406 showed better parent as well as standard heterosis over check for maximum number of traits viz., harvest index, pods per cluster, seeds per pod and secondary branches per plant and yield. Both additive and non-additive gene actions were involved in governing the inheritance of traits. This study suggests, even parents with poor GCA possess the potential to produce heterotic crosses. The manifestation of high amount of heterosis for seed yield and component traits by a large number of crosses suggest for the need to maintain heterozygosity in the population for maximum expression of the traits in desired direction.

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Diallel Analysis for Area, Chlorophyll and Temperature of Flag Leaf in Bread Wheat under Well Watered and Drought Stress Conditions

Journal of Agricultural Science ◽

10.5539/jas.v13n10p45 ◽

2021 ◽

Vol 13 (10) ◽

pp. 45

Author(s):

Naheif E. Mohamed ◽

Ismail M. Bedawy ◽

Yasser A. M. Hefny

Keyword(s):

Drought Stress ◽

Bread Wheat ◽

Flag Leaf ◽

Block Design ◽

Diallel Analysis ◽

Stress Conditions ◽

F1 Hybrids ◽

Gene Effects ◽

Genetic Components ◽

Additive Gene

To study genetic analysis of some physiological traits of drought stress in wheat using diallel techniques, an experiment was performed on ten bread wheat genotypes as parents and their 45 F1 hybrids in a randomized complete block design with three replicates under well-watered and drought stress conditions at the Research Farm of Faculty of Agriculture, Sohag University, Egypt during season of 2018/19. The results showed significant differences between the genotypes (G), Parents (P), F1 crosses, P vs. F1, GCA and SCA under well-watered and drought stress in the flag leaf area (FLA), flag leaf chlorophyll content (FLCC) and flag leaf temperature (FLT), except FLCC for F1 crosses exhibited insignificant differences. The significant differences were found in the interaction of SCA × Env., in all studied traits and GCA × Env., for FLT., indicating the involvement of both additive and dominance gene action in their inheritance. The most desirable heterotic effects were considered as the largest positive heterosis estimates for FLA and FLCC, and the lowest negative for FLT. The parent numbers P9, P8 and P3 were the best general combiner for FLA under normal irrigation and drought stress. While the parents P2, P7 and P9 were the best general combiner for FLCC, under normal irrigation and (P1, P2 and P3) under drought stress. Therefor the parents P1, P4 and P5 were the best general combiner for FLT under normal irrigation, also the P3, P4 and P5 were the best general combiner for FLT under drought stress conditions. Under normal irrigation and drought stress conditions as well as the combined data, the additive genetic components of variation (VA) in F1 ’s was much greater than dominance component (VD), as expressed by the (VA/VD) ratio which was more than unity for the FLA, and FLT under normal irrigation and their combined. This indicates that the additive gene effects in F1 crosses are more important than dominance and plays the major role in the inheritance of these studied traits.

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GENE ACTIONS OF TRAITS CONTRIBUTING TO LODGING RESISTANCE IN WHEAT (Triticum aestivum L)

Bangladesh Journal of Plant Breeding and Genetics ◽

10.3329/bjpbg.v20i2.17031 ◽

2007 ◽

Vol 20 (2) ◽

pp. 23-30 ◽

Cited By ~ 2

Author(s):

Z. I. Sarker ◽

A. K. M. Shamsuddin ◽

R. Ara

Keyword(s):

Recurrent Selection ◽

Gene Action ◽

Breaking Strength ◽

Gene Interaction ◽

Triticum Aestivum L ◽

Lodging Resistance ◽

Gene Effects ◽

Additive Gene ◽

Almost All ◽

Additive Genes

Estimates of gene action for lodging related traits at Wheat Research Center during 1999-2002 in three crosses of wheat showed different genetic control of the traits among the crosses. For almost all traits, additive or dominance effects or both components were significant in either three- or six-parameter model, indicating that both additive and dominance gene effects were operative for different traits contributing to lodging resistance. Although duplicate type of epistasis was also observed for second internode breaking strength, plant height and spikes per plant and grain yield per plant once in different crosses, additive x additive epistasis along with additive gene action for the aforesaid traits would improve selection of the same in the segregating populations. The additive x dominance gene interaction for second internode length, diameter and wall thickness would be useful too for improvement of second internode breaking strength and consequently lodging resistance, as their inheritance and selection in segregating populations would be relatively easier than the traits controlled by completely non-additive genes. For duplicate type of epistasis biparental mating or recurrent selection followed by conventional selection is suggested.DOI: http://dx.doi.org/10.3329/bjpbg.v20i2.17031

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Combining Ability Analysis of Blast Disease Resistance and Agronomic Traits in Finger Millet [Eleusine coracana (L.) Gaertn]

Journal of Agricultural Science ◽

10.5539/jas.v8n11p138 ◽

2016 ◽

Vol 8 (11) ◽

pp. 138 ◽

Cited By ~ 1

Author(s):

Lawrence Owere ◽

Pangirayi Tongoona ◽

John Derera ◽

Nelson Wanyera

Keyword(s):

Disease Resistance ◽

Combining Ability ◽

Finger Millet ◽

Gene Action ◽

Agronomic Traits ◽

The Other ◽

Blast Disease ◽

Additive Gene Action ◽

Gene Effects ◽

Additive Gene

Blast disease is the most important biotic constraint to finger millet production. Therefore disease resistant varieties are required. However, there is limited information on combining ability for resistance and indeed other agronomic traits of the germplasm in Uganda. This study was carried out to estimate the combining ability and gene effects controlling blast disease resistance and selected agronomic traits in finger millet. Thirty six crosses were generated from a 9 × 9 half diallel mating design. The seed from the 36 F1 crosses were advanced by selfing and the F2 families and their parents were evaluated in three replications. General combining ability (GCA) for head blast resistance and the other agronomic traits were all highly significant (p ≤ 0.01), whereas specific combining ability (SCA) was highly significant for all traits except grain yield and grain mass head-1. On partitioning the mean sum of squares, the GCA values ranged from 31.65% to 53.05% for head blast incidence and severity respectively, and 36.18% to 77.22% for the other agronomic traits measured. Additive gene effects were found to be predominant for head blast severity, days to 50% flowering, grain yield, number of productive tillers plant-1, grain mass head-1, plant height and panicle length. Non-additive gene action was predominant for number of fingers head-1, finger width and panicle width. The parents which contributed towards high yield were Seremi 2, Achaki, Otunduru, Bulo and Amumwari. Generally, highly significant additive gene action implied that progress would be made through selection whereas non-additive gene action could slow selection progress and indicated selection in the later generations.

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