DIALLEL ANALYSIS OF LEAF CHARACTERISTICS IN INDIAN MUSTARD

1971 ◽  
Vol 13 (4) ◽  
pp. 683-689
Author(s):  
Shree Pal Singh ◽  
Dharampal Singh
Keyword(s):  
Indian Mustard ◽  
Leaf Size ◽  
Diallel Analysis ◽  
Diallel Cross ◽  
Leaf Length ◽  
Leaf Width ◽  
Gene Effects ◽  
Partial Dominance ◽  
Complete Diallel Cross ◽  
Additive Gene

A complete diallel cross involving four experimental strains and six standard cultivars of Indian mustard. Brassica juncea (L.) Czern. and Coss., was investigated for the inheritance of leaf length and leaf width. Considerable heterosis and heterobeltiosis were found in certain hybrid combinations for both characters. Several crosses exceeded the performance of the best cultivar. Partial dominance for leaf length and overdominance for leaf width were observed. Highly significant additive gene effects were found for both characters bur only about one third of the total variance exhibited by leaf length and about one sixth of that by leaf width may be ascribed to this component. The correlation between the two characters was positive. It was concluded that breeding programs should put more emphasis on leaf length rather than leaf width for effective manipulations of leaf size.

DIALLEL ANALYSIS OF LEAF NUMBER AND DURATION TO MID-SILK IN MAIZE

1977 ◽  
Vol 19 (2) ◽  
pp. 251-258 ◽  
Author(s):  
E. E. N. A. Bonaparte
Keyword(s):  
Zea Mays L ◽  
Diallel Analysis ◽  
Diallel Cross ◽  
Inbred Lines ◽  
Leaf Number ◽  
Gene Effects ◽  
Partial Dominance ◽  
Effective Factor ◽  
Additive Gene ◽  
Mode Of Inheritance

The diallel cross technique was used to study the mode of inheritance of leaf number and duration to mid-silk in six inbred lines of maize (Zea mays L.). Leaf number showed partial dominance, and the additive gene effects accounted for a high proportion of the total variation. The narrow and broad heritabilities were both high. Leaf number was controlled by at least one effective factor. Both additive and dominance components were responsible for the expression of duration to mid-silk. The narrow and broad heritabilities were both high. Duration to mid-silk was controlled by at least four effective factors.

Genetic control of resistance to Kabatiella caulivora in Trifolium subterraneum subspecies yanninicum I. Diallel analysis of variation in disease development parameters

1980 ◽  
Vol 31 (5) ◽  
pp. 927 ◽  
Author(s):  
PE Beale ◽  
N Thurling
Keyword(s):  
Trifolium Subterraneum ◽  
Diallel Analysis ◽  
Diallel Cross ◽  
Disease Development ◽  
Disease Score ◽  
Complete Diallel Cross ◽  
Disease Rating ◽  
Additive Gene ◽  
Efficient Breeding ◽  
Analysis Of Variation

A l0 x 10 complete diallel cross of Trifolium subterraneum subspecies yanninicum genotypes was evaluated for resistance to Kabatiella cauliuoua as F2 swards. Analysis of variance of the diallel cross data indicated that variation in 10 October disease score, total disease development (TDD), rate of disease development (Rate) and time to 50% of maximum disease rating (Delay) were heritable. Coefficients of regression of Wr on Vr were significantly greater than zero but not significantly different from a value of 1 for all four disease parameters. Although this evidence is not conclusive, it does suggest that gene interactions are relatively unimportant. Most non-additive gene action could be attributed to dominance effects and, in terms of both 10 October disease score and total disease development (TDD), a high proportion of alleles conferring resistance were dominant. No clear relationship between phenotype and relative proportions of dominant and recessive alleles was evident for either Rate or Delay. Estimates of dominance variance components were, with the exception of Delay, substantially greater than the additive genetic component. Values of F were positive for all parameters and, except for Delay, values of v(H1/D) were greater than 1, which indicated that dominant alleles are more frequent than recessive alleles among the parents and that dominance is complete at those loci exhibiting dominance. Heritabilities (broad and narrow sense) were substantially greater for TDD and 10 October disease score than for Rate and Delay. The implications of these results are discussed in relation to the development of efficient breeding strategies.

scholarly journals Diallel analysis of seven quantitative traits in deshi jute (Corchorus capsularis L.)

1970 ◽  
Vol 39 (2) ◽  
pp. 137-141
Author(s):  
Rahima Khatun ◽  
RH Sarker ◽  
MA Sobhan
Keyword(s):  
Dominance Effect ◽  
Diallel Analysis ◽  
Diallel Cross ◽  
Genetic System ◽  
Genetic Constitution ◽  
Base Diameter ◽  
Partial Dominance ◽  
Corchorus Capsularis ◽  
Recessive Genes ◽  
Additive Gene

Genetic constitution of yield and its associated traits of Corchorus capsularis L. was investigated using a 10 × 10 full diallel cross experiment. Additive gene action system with partial dominance was predominat for plant height, technical height, base diameter and number of nodes in F1. Non-allellic interaction was involved in the inheritance of bark weight and stick weight in F2. The Vr - Wr graph for bark weight and fibre weight of F1 and F2 showed an additive genetic system with dominance effect. The parents Acc. 4087 and var. A-38 possessed maximum number of dominant alleles for most of the characters. Acc.1833 possessed an excess of recessive genes for all the characters. Key words: Diallel analysis; Inheritance; Dominance effect; Corchorus capsularisDOI: 10.3329/bjb.v39i2.7299 Bangladesh J. Bot. 39(2): 137-141, 2010 (December)

GENETIC ANALYSIS OF SEED SIZE IN PIGEON PEA CAJANUS CAJAN

1972 ◽  
Vol 14 (3) ◽  
pp. 545-548
Author(s):  
D. Sharma ◽  
Laxman Singh ◽  
S. S. Baghel ◽  
H. K. Sharma
Keyword(s):  
Seed Size ◽  
Cajanus Cajan ◽  
Diallel Analysis ◽  
Pigeon Pea ◽  
Gene Effects ◽  
Partial Dominance ◽  
Degree Of Dominance ◽  
Wide Range ◽  
Additive Gene ◽  
High Heritability

Diallel analysis for seed size on 10 varieties of pigeon pea or arhar Cajanus cajan L. Millsp., representing different maturity groups and wide range of variability in seed size, was conducted to determine genetic parameters. The D and H1 components indicated a predominance of additive gene effects and the degree of dominance was in the partial dominance range. Seed size was simply inherited with a high heritability value of 0.82. The scatter of parental arrays in a Wr, Vr graph suggested that the genes controlling smaller seed size were dominant over the genes controlling larger seed size. The analysis indicated the possibility of improving seed size by simple selection procedures.

PHOTOPERIODIC RESPONSE AND ITS EFFECTS ON CERTAIN QUANTITATIVE CHARACTERS IN TOBACCO

1968 ◽  
Vol 10 (3) ◽  
pp. 515-522 ◽  
Author(s):  
Bronius Povilaitis
Keyword(s):  
Major Gene ◽  
Photoperiodic Response ◽  
Leaf Length ◽  
Leaf Width ◽  
Gene Effects ◽  
Short Day ◽  
Additive Gene ◽  
Relationship Of ◽  
Positive Heterosis ◽  
The Relationship

The effects of the mammoth gene causing a short-day photoperiodic response in a mutant were studied in 1962 and 1966 in six genetic populations (P1, P2, F1, F2, B1 B2) derived from the cross between Mammoth Delcrest, a short-day mutation of the flue-cured tobacco variety Delcrest, and Praecox, a day-neutral pipe tobacco. The data showed the expected monofactorial segregation of day-neutral against short-day plants, the latter being recessive. Considerable amount of positive heterosis was observed for leaf width. In the inheritance of days-to-flower, in addition to the pair of alleles determining the short-day response, one to two gene groups are indicated, operating probably in an additive fashion. Two and three gene groups are indicated for leaf width and leaf length, respectively. Parameters describing additive gene effects were important for all the character tested but none of the parameters for dominance and digenic epistatic effects were significant. Evidently the segregating major gene for the mammoth character did not excessively influence the relationship of gene effects in the remaining genotype as determined by the generation-mean analysis.

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

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.

scholarly journals Genetic variance of sunflower yield components - Heliantus annuus L.

Genetika ◽  
2003 ◽  
Vol 35 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Nada Hladni ◽  
Dragan Skoric ◽  
Marija Kraljevic-Balalic
Keyword(s):  
Leaf Area ◽  
Plant Height ◽  
Leaf Number ◽  
Total Leaf Area ◽  
Gene Effects ◽  
Partial Dominance ◽  
Mean Values ◽  
Total Leaf ◽  
Additive Gene ◽  
Mode Of Inheritance

The main goals of sunflower breeding in Yugoslavia and abroad are increased seed yield and oil content per unit area and increased resistance to diseases, insects and stress conditions via an optimization of plant architecture. In order to determine the mode of inheritance, gene effects and correlations of total leaf number per plant, total leaf area and plant height, six genetically divergent inbred lines of sunflower were subjected to half diallel crosses. Significant differences in mean values of all the traits were found in the F1 and F2 generations. Additive gene effects were more important in the inheritance of total leaf number per plant and plant height, while in the case of total leaf area per plant the nonadditive ones were more important looking at all the combinations in the F1 and F2 generations. The average degree of dominance (Hi/D)1/2 was lower than one for total leaf number per plant and plant height, so the mode of inheritance was partial dominance, while with total leaf area the value was higher than one, indicating super dominance as the mode of inheritance. Significant positive correlation was found: between total leaf area per plant and total leaf number per plant (0.285*) and plant height (0.278*). The results of the study are of importance for further sunflower breeding work.

scholarly journals DIALLEL ANALYSIS OF TOLERANCE TO DROUGHT IN COWPEA GENOTYPES

2018 ◽  
Vol 31 (1) ◽  
pp. 40-47 ◽  
Author(s):  
ERINA VITÓRIO RODRIGUES ◽  
KAESEL JACKSON DAMASCENO-SILVA ◽  
MAURISRAEL DE MOURA ROCHA ◽  
EDSON ALVES BASTOS ◽  
ADRIANO DOS SANTOS
Keyword(s):  
Water Deficit ◽  
Recurrent Selection ◽  
Diallel Analysis ◽  
Diallel Cross ◽  
Limiting Factors ◽  
Additive Effects ◽  
Negative Effects ◽  
Complete Diallel Cross ◽  
Brazilian Northeast ◽  
Block Experiment

ABSTRACT The low use of technologies by farmers and the occurrence of biotic and abiotic stresses are limiting factors for cowpea production in the Brazilian Northeast region. The tolerance of genotypes to drought is an alternative to decrease the negative effects of stresses on cowpea production. Thus, the objective of this work was to identify parents and combinations of cowpea genotypes with high probability of generating segregating populations with tolerance to drought. Six cowpea genotypes were crossed in a complete diallel cross design, totaling 30 F2 populations, which were evaluated together with their parents in an experiment under water deficit at the experimental field of the Embrapa Mid-North, Teresina, State of Piauí, Brazil. A triple lattice incomplete block experiment design was used, with three replications, with experimental plot consisting of six 2-m plant rows. Fifteen plants per plot were sampled to evaluate their agronomic characteristics, whose results were subjected to analysis of variance and means were used to estimate the general and specific combining abilities. The genotypes showed significant differences in all characteristics evaluated, denoting the genetic variability of the population. The additive effects were more important than the non-additive effects, and maternal inheritance was detected. The genotypes BRS Xiquexique, Pingo-de-Ouro-1-2 and MNC99-510F-16-1 were the most promising for use in recurrent selection programs for tolerance to water deficit. The hybrid combinations (1) BRS Paraguaçu X (4) CNCx-698-128G, (2) Pingo-de-Ouro-1-2 X (3) BRS Xiquexique, (3) BRS Xiquexique X (5) Santo-Inácio, (4) CNCx-698-128G X (6) MNC99-510F-16-1 and (5) Santo-Inácio X (4) CNCx-698-128G showed potential for generating superior lineages regarding bean production and tolerance to water deficit.

scholarly journals Diallel Analysis of Chilli Pepper (Capsicum annuum L.) Genotypes for Morphological and Fruit Biochemical Traits

Plants ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 1
Author(s):  
Aiswarya C. S. ◽  
Vijeth S ◽  
Sreelathakumary I ◽  
Prashant Kaushik
Keyword(s):  
Vitamin C ◽  
Combining Ability ◽  
Yield Components ◽  
Diallel Analysis ◽  
General Combining Ability ◽  
Biochemical Traits ◽  
Chilli Pepper ◽  
Gene Effects ◽  
Commercial Cultivation ◽  
Additive Gene

Chilli pepper is commercially cultivated as a spice and is also used for the extraction of a colouring agent. Here, we performed a diallel genetic study involving five chilli pepper varieties. Parents and their hybrid were evaluated for fifteen morphological and five biochemical traits over two crop seasons under open field conditions. Variation was recorded for all of the studied traits. Similarly, significant values for general combining ability (GCA) and specific combining ability (SCA) variance were obtained for all of the traits. The ratio of σ2 SCA/σ2 GCA indicates that non-additive gene effects were predominant for all the studied traits except for fruits plant−1. Based on SCA effects, cross combinations P2 × P5, and P4 × P5 were determined excellent for flesh thickness, yield components and vitamin C. These hybrids are recommended for multilocation testing to assess their suitability for commercial cultivation. Overall, this work presents useful information regarding the genetics of important morphological and biochemical traits in chilli pepper.

INHERITANCE OF PERICARP THICKNESS IN SHORT SEASON MAIZE INBREDS

1975 ◽  
Vol 17 (4) ◽  
pp. 621-629 ◽  
Author(s):  
L. C. Ho ◽  
L. W. Kannenberg ◽  
R. B. Hunter
Keyword(s):  
Heritability Estimate ◽  
Narrow Sense Heritability ◽  
Gene Effects ◽  
Partial Dominance ◽  
Epistasis Analysis ◽  
Graphic Analysis ◽  
Additive Gene ◽  
Short Season ◽  
High Level ◽  
Pericarp Thickness

Pericarp thickness of 16 short-season inbred lines of corn (Zea mays L.) ranged from 35 to 126 μm with an overall mean of 82 ± 5 μm. The mode of inheritance of this trait was studied in two experiments. Two inbreds representing the extremes of pericarp thickness, their F1 and F2 generations, and both first generation backcrosses were included in Experiment 1. The inheritance of pericarp thickness proved to be quantitative in nature. All gene effects were significant, but epistatic effects, particularly dominance × dominance, were the largest in this particular cross. This could have resulted from bias due to linkage disequilibrium. Experiment 2 was a diallel set of 5 inbreds to include the parents and all possible single crosses, but not reciprocals. Diallel graphic analysis of these data indicated partial dominance for thin pericarp with minimal epistasis. Analysis II of Gardner and Eberhart showed that the mean square for line effects was several times larger than the heterosis estimates, indicating a high level of additive gene effects. The narrow sense heritability estimate was 72%. Thus selection for specific pericarp thickness should be effective and relatively rapid.

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