DIALLEL ANALYSIS OF THE INHERITANCE OF RESISTANCE TO RACE 6 OF PLASMODIOPHORA BRASSICAE IN CABBAGE

1976 ◽  
Vol 56 (4) ◽  
pp. 865-868 ◽  
Author(s):  
M. S. CHIANG ◽  
R. CRÊTE
Keyword(s):  
Plasmodiophora Brassicae ◽  
Major Gene ◽  
Diallel Analysis ◽  
Diallel Cross ◽  
Inheritance Of Resistance ◽  
Narrow Sense Heritability ◽  
Gene Group ◽  
Recessive Genes ◽  
High Dominance ◽  
Additive Genetic Effects

A randomized complete block experiment of a 4 × 4 diallel cross was conducted in the greenhouse to study the inheritance of resistance to race 6 of Plasmodiophora brassicae Wor. in cabbage (Brassica oleracea var. capitata L.). Results show that additive genetic effects are high; dominance effects are also present but much lower as compared to the additive effects. It appears that there is only one major gene group showing dominance. Cultivar Badger Shipper carries the most recessive genes among the four parents studied. The narrow sense heritability is estimated at 83%.

Genetic Component and Vr-Wr Graphical Analysis in Blackgram [Vigna mungo (L.) Hepper]

2021 ◽  
Author(s):  
Neha Sharma ◽  
R.K. Mittal ◽  
V.K. Sood
Keyword(s):  
Major Gene ◽  
Diallel Analysis ◽  
Epistatic Effect ◽  
Graphical Analysis ◽  
Gene Group ◽  
Genetic Components ◽  
Additive Gene ◽  
Selection Methodology ◽  
Half Diallel

Background: To develop a new high yielding variety, it is important to generate utilitarian recombinants and devise an appropriate strategy for selection and advancement of those recombinants. Method: Keeping this in mind, genetic components of yield and its related traits were determined in nine genotypes of blackgram through half diallel analysis using Hayman’s numerical and graphical approach. Conclusion: The estimates of genetic components deduced the role of non-additive gene action in the inheritance of all traits. The Vr-Wr graphical analysis revealed that assumptions laid by Hayman for diallel analysis were seldom fulfilled. Epistatic effect was predominant in all traits except days to 75 per cent maturity. Unidirectional dominance was observed in days to 75 per cent maturity, pods per plants and seed yield per plant and crude protein content. One major gene group was found controlling all traits except days to 75 per cent maturity and branches per plant. These findings can be used by breeders to devise appropriate selection methodology for yield improvement in blackgram.

Exploring the breeding potential of Iranian emmer wheats to increase durum wheat tolerance to drought

2021 ◽  
Vol 19 (4) ◽  
pp. 363-374
Author(s):  
Majid Mohammadi ◽  
Aghafakhr Mirlohi ◽  
Mohammad Mahdi Majidi ◽  
Ali Rabbani
Keyword(s):  
Drought Tolerance ◽  
Grain Yield ◽  
Durum Wheat ◽  
Triticum Turgidum ◽  
Diallel Analysis ◽  
Diallel Cross ◽  
Yield Component ◽  
Narrow Sense Heritability ◽  
Partial Dominance ◽  
Tolerance Improvement

AbstractEmmer wheat (Triticum turgidum ssp. dicoccum) is one of the most promising gene sources for drought tolerance improvement of durum wheat (Triticum turgidum ssp. durum). Achieving desired results requires a conscious choice of crossing parents based on general and specific combining ability (GCA and SCA) and also understanding the genes action involved in controlling the desired traits. In this study a 12 × 12 full diallel cross was performed using four emmer and eight durum wheats. The 132 hybrid progenies along with their parental lines were field evaluated under water-stressed and non-stressed conditions. Based on the Griffing diallel analysis both GCA and SCA effects were highly significant for all measured traits under both water treatments indicating possibility of improvement for drought tolerance. In this respect, the amount of additive effect was higher than the non-additive suggesting the chance for genetic advancement through selection. Based on Hayman's graphical analyses under the two water conditions it was revealed that several grain yield component traits were under the control of partial dominance. In contrary, grain yield and most morphological traits showed either dominance or over-dominance gene action. Grain yield had a significant positive correlation with the number of kernels per spike, kernel diameter, grain weight per spike and harvest index. These traits also had greater share of additive effects, relatively high narrow-sense heritability and high Baker ratio suggesting effective indirect selection for grain yield. Most durum × emmer hybrids had grain yield and drought tolerance indices better than the parents indicating that Iranian emmer wheats have a great genetic potential for drought tolerance improvement of durum wheat.

scholarly journals Genetic analysis of Plant Height, Yield Components and Seed Yield in Rapeseed (Brassica Napus L.) Cultivars

2014 ◽  
Vol 67 (1) ◽  
pp. 61-74
Author(s):  
Valiollah Rameeh
Keyword(s):  
Brassica Napus ◽  
Plant Height ◽  
Seed Yield ◽  
Combining Ability ◽  
Seed Weight ◽  
Main Axis ◽  
Brassica Napus L ◽  
Narrow Sense Heritability ◽  
Recessive Genes ◽  
Additive Genetic Effects

Abstract Half F2 diallel crosses of spring rapeseed (Brassica napus L.) varieties along with their parents were evaluated for plant height, first siliqua height, siliquae on main axis, siliquae per plant, 1000-seed weight and seed yield. The Analysis of variance based on Cockerham’s method revealed significant mean squares of general combining ability (GCA), specific combining ability (SCA) for all the traits indicating that both additive and non-additive genetic effects were involved in controlling these traits. Parent vs crosses mean square which is indicating average heterosis was significant for all the traits. In Hayman’s method the regression lines estimated for all the traits except plant height cut the Wr axis below the origin in the negative zone, suggesting the overdominance type of gene action for these traits except plant height. Based on the array points on the regression lines, 19H had maximum dominant genes for siliquae on main axis, siliquae per plant 1000-seed weight and seed yield, being closest to the origin, while 0ption500 possessed recessive genes for first siliqua height, siliquae per plant and 1000-seed weight, as evidenced by its distant position from the origin. Due to low narrow-sense heritability estimates for most of the traits, selection for improving these traits should be carried out in delayed segregating generations.

scholarly journals Inheritance of length and weight of mature larvae in six-parent diallel crosses of Mulberry Silkworm, Bombyx mori L.

2015 ◽  
Vol 21 ◽  
pp. 77-87
Author(s):  
HA Rashid ◽  
MK Ahsan ◽  
MA Hasan ◽  
I Mahfus
Keyword(s):  
Gene Action ◽  
Recessive Gene ◽  
Diallel Cross ◽  
Narrow Sense Heritability ◽  
Gene Effects ◽  
Positive Effects ◽  
Recessive Genes ◽  
Negative Effect ◽  
Mulberry Silkworm ◽  
Dominant Genes

Context: To gain a better understanding of the nature of gene action involved in the inheritance of quantitative characters can be obtained through the use of diallel cross analytical approach for the choice of desirable parents and the formulation of an effective breeding programme. Objectives: The aim was to study the nature and magnitude of gene action of inheritance for quantitative traits, length and weight of mature larvae in B. mori through six-parent diallel cross analysis in four rearing seasons Materials and Methods: Six inbred varieties of B. mori were used as parents for a diallel cross. The experiment was conducted in four rearing seasons. Mature larval length (cm) and weight (gm) were collected for statistical analysis. The data were analyzed following the biometrical techniques proposed by Jinks and Hayman (1953), Hayman (1954), Dickinson and Jinks (1956) and Jhonson and Aksel (1964). Results: In the Hayman’s analysis of variance for length and weight of mature larvae the items ‘a’ and ‘b’ were found to be significant against all the three tests of significance. The item ‘b2’ was significant for the seasons S-2 and S-3 and the ‘b3’ item was significant for all the seasons. The Items ‘c’ and ‘d’ were insignificant in all the seasons. The regressions of Wr on Vr for majority of the seasons were significant but did not deviate significantly from unit slope. The varieties Nistari, Nistari oval (G) and NanNung7B of S-1, S-2 and S-4, and Nistari of S-3 for length of larvae and Nistari and Nistari oval (G) of S-1, S-2 and S-3 and Nistari, Nistari oval (G) and Nan Nung 7B of S-4 for larval weight possessed an excess of recessive genes of negative effect. But Nistari oval (G) in S-3 for LL possessed excess of recessive genes with positive effects. On the other hand BSRI-95, BSRI-98 and BV (high) in S-1, S-2 and S-4, and Nan Nung 7B, BSRI-98 and BV(high) in S-3 for LL and BSRI-95, BSRI-98 and BV(high) in S-1, S-2 and S-3, and BSRI-95 and BV(high) in S-4 for LW possessed an excess of dominant genes, which was positive in nature. In S-3 only BSRI-95 for LL and NanNung7B in S-1, S-2 and S-3 and BSRI-98 in S-4 for LW possessed an excess of dominant genes of negative nature. At least one group of dominant genes was involved in controlling these characters. The broad sense heritability was high in all seasons for both the characters whereas the narrow sense heritability was moderate for majority of the seasons except S-3 and S-4 for LW. Conclusion: High heritability, dominant and recessive gene effects suggest that these parents could be used to develop better lines in respect of larval characters investigated in this study and selection programmes will be effective in early generations. DOI: http://dx.doi.org/10.3329/jbs.v21i0.22522 J. bio-sci. 21: 77-87, 2013

scholarly journals Inheritance of Resistance to Colletotrichum Species in Strawberry

1991 ◽  
Vol 116 (4) ◽  
pp. 724-727 ◽  
Author(s):  
Creighton L. Gupton ◽  
Barbara J. Smith
Keyword(s):  
Recurrent Selection ◽  
Major Gene ◽  
Broad Sense ◽  
Inheritance Of Resistance ◽  
Broad Sense Heritability ◽  
Narrow Sense ◽  
Narrow Sense Heritability ◽  
Genetic Variances ◽  
Heritability Estimates ◽  
Selection Of

Experiments were conducted to estimate the relative importance of additive and dominance genetic variances and non-allelic interactions in the inheritance of resistance to Colletotrichum spp. in strawberry (Fragaria × ananassa Duch.). Progeny of 40 parents crossed in a Comstock and Robinson Design II Mating scheme were inoculated with three isolates of C. fragariae and one isolate of C. acutatum. Disease development on each plant was rated visually. Variance components were estimated and converted to genetic variances. Estimates of were six to 10 times higher than those for Within-family variance not accounted for by equaled 35% and 38% of the total genetic variance in females and males, respectively, indicating probable epistatic effects. The frequency distribution of disease severity ratings was bimodal in both experiments, suggesting major gene action. Narrow-sense heritability estimates were 0.37 and 0.26, and broad-sense heritability estimates were 0.87 and 0.85 for females and males, respectively. Narrow-sense heritability estimates are probably sufficient to produce gains from recurrent selection. Gains from selection of clonal value should be possible because of the high broad sense heritability estimates. It appears feasible to establish a broad genetic-based population resistant to Colletotrichum spp. from which selections could be evaluated per se and/or recombined to produce improved populations.

scholarly journals Diallel cross analysis of filament length in the silkworm, Bombyx mori L.

2013 ◽  
Vol 38 (2) ◽  
pp. 247-255
Author(s):  
HA Rashid ◽  
SM Rahman ◽  
MK Ahsan
Keyword(s):  
Bombyx Mori ◽  
Dominance Effect ◽  
Diallel Analysis ◽  
Diallel Cross ◽  
Filament Length ◽  
Narrow Sense Heritability ◽  
Reciprocal Effect ◽  
Wide Range ◽  
Bombyx Mori L ◽  
Silkworm Bombyx Mori

A diallel analysis for filament length in six varieties of silkworm, Bombyx mori L. having a wide range of variability has been genetically analysed by means of 6×6 diallel cross. The results indicated that both additive and non-additive genetic variations were important for determining the expression of this trait. Besides the dominance, deviation of genes present in this diallel existed predominantly in one direction and they were independent of reciprocal effect and some of the parents contained more dominant than recessive alleles in S-1 and S-3. The presence of specific dominance effect which were peculiar to individual crosses and a significant part of it was independent of reciprocal effect. The regression of filament length is deviated significantly from unity in majority of the seasons (except S-4) giving a contrasting result implying the presence of nonallelic interaction. The distribution of genes for two seasons (S-2 and S-3) was not symmetrical, while the rest two seasons (S-1 and S-4) showed symmetrical distribution of positive and negative among the parents. In narrow sense heritability was found to be medium to high and the broad sense heritability was high among the studied varieties. DOI: http://dx.doi.org/10.3329/jasbs.v38i2.15616 J. Asiat. Soc. Bangladesh, Sci. 38(2): 247-255, December 2012

scholarly journals Inheritance of resistance to the Papaya ringspot virus-watermelon strain (PRSV-W) from watermelon accession 'PI 595201'

2012 ◽  
Vol 12 (1) ◽  
pp. 67-75 ◽  
Author(s):  
Sebastião Márcio de Azevedo ◽  
Wilson Roberto Maluf ◽  
Marcos Ventura Faria ◽  
Juliano Tadeu Vilela de Resende ◽  
Cícero Beserra de Menezes ◽  
...  
Keyword(s):  
Genetic Variance ◽  
Inheritance Of Resistance ◽  
Papaya Ringspot Virus ◽  
Likelihood Methods ◽  
Brazilian Isolate ◽  
Narrow Sense Heritability ◽  
Monogenic Inheritance ◽  
Additive Component ◽  
Maximum Likelihood Methods ◽  
Additive Genetic Effects

Two watermelon genotypes were used as parental in crosses designed to study the inheritance of resistance to PRSV-W: the cultivar Crimson Sweet (susceptible) and the accession 'PI 595201'(resistant). Plants of the generations P1, P2, F1, F2, BC11 e BC12 were inoculated with a Brazilian isolate of PRSV-W and were evaluated by recording symptoms. Genetic and phenotypic parameters of PRSV-W resistance were estimated and tests based on hypothesis of monogenic inheritance and maximum likelihood methods were performed. The additive component [a] of resistance was higher than the non-additive [d]. The estimates of the broad-sense heritability (0.80) and of narrow-sense heritability (0.67) indicated that the genetic variance was greater than the environmental, allowing higher genetic gains in selecting more resistant plants in segregating populations. The inheritance is more complex than a typical monogenic inheritance. The importance of the additive genetic effects in the expression of resistance to PRSV-W was evidenced.

scholarly journals Combining Ability and Heterosis in Diallel Analysis of Maize (Zea mays L.) Lines

2020 ◽  
Vol 9 (1) ◽  
pp. 188-200
Author(s):  
Francis Chukwuma Onejeme ◽  
Emmanuel Ogbonna Okporie ◽  
Chinedu Emmanuel Eze
Keyword(s):  
Grain Yield ◽  
Combining Ability ◽  
Block Design ◽  
Diallel Analysis ◽  
Diallel Cross ◽  
Maize Breeding ◽  
Ear Height ◽  
Check Variety ◽  
Additive Genetic Effects ◽  
Positive Heterosis

A sound breeding program for maize improvement is very important to meet the demands of the growing population. Therefore, combining ability and heterosis were studied in a 4 x 4 full diallel cross in maize for growth attributes, yield and its contributing traits. Randomized Complete Block Design (RCBD) with four replicates was used to study the general combining ability of parents, specific combining ability of F1s (including reciprocals) and heterosis of the F1s over commercial check variety on selected agronomic characters. Genotype was highly significant for all the traits studied. The combining abilities (GCA and SCA) and reciprocal mean squares were highly significant for most studied characters. The ratio of GCA/SCA was not less than unity for studied traits excepted for days to anthesis and ear height. The results indicated that the additive genetic effects were more important and played major role in studied traits. Thus, results revealed GCA effects for the parental lines (PL). Where ‘PL2’ was excellent combiner for number of tassels and cob circumference and ‘PL3’ was good combiner for days to silking and grain yield (t.h-1). While ‘PL4’ for short height. Majority of the F1s from the GCA effects showed high SCA effects. This F1 (PL2 x PL3) performed best amongst. However, several reciprocals were not desirable. Heterosis estimation was carried out using a commercial check, Oba super II. When commercial check was used, the percent heterosis especially on grain yield varied from -8.89 to 22.62%. Among the twelve F1s, nine of the crosses exhibited significant positive heterosis for grain yield (t.h-1). Those F1s that showed significant positive and/or negative desirable traits for SCA effects and significant positive heterosis could be used for varietal development in maize breeding. And conservation of those parents that exhibited high GCA effects be considered as well.

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)

Inheritance of stem strength and its correlations with culm morphological traits in wheat (Triticum aestivum L.)

2011 ◽  
Vol 91 (6) ◽  
pp. 1065-1070 ◽  
Author(s):  
Jinbao Yao ◽  
Hongxiang Ma ◽  
Pingping Zhang ◽  
Lijuan Ren ◽  
Xueming Yang ◽  
...  
Keyword(s):  
Triticum Aestivum ◽  
Morphological Traits ◽  
Genetic Effect ◽  
Diallel Cross ◽  
Triticum Aestivum L ◽  
Dominance Model ◽  
Narrow Sense Heritability ◽  
Stem Strength ◽  
Basal Internode ◽  
Recessive Genes

Yao, J., Ma, H., Zhang, P., Ren, L., Yang, X., Yao, G., Zhang, P. and Zhou, M. 2011. Inheritance of stem strength and its correlations with culm morphological traits in wheat ( Triticum aestivum L.). Can. J. Plant Sci. 91: 1065–1070. The genetic effect of stem strength and its correlation with culm morphological traits were investigated in a 7×7 diallel cross of wheat involving seven parents (Ningmai 8, Ningmai 9, Yangmai 5, Yangmai 9, Yangmai 11, Sumai 3, and Wangshuibai) during the crop season of 2009–2010. Significant differences were observed among genotypes for stem strength. The estimates of general combining ability (GCA) pointed out that the best general combiners for stem strength were Ningmai 8 and Yangmai 9. The additive-dominance model was adequate for stem strength, and it was controlled by the over dominance type of gene action. Ningmai 8, followed by Yangmai 5, possessed maximum recessive genes, whereas Wangshuibai had maximum dominant genes. Stem strength could be controlled by three genes with low narrow sense heritability. A statistical analysis showed that stem strength is highly significantly correlated with nine culm morphological traits except for diameter of the first basal internode.

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