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

2016 ◽  
Vol 8 (11) ◽  
pp. 138 ◽  
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

<p>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 F<sub>1</sub> crosses were advanced by selfing and the F<sub>2</sub> 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<sup>-1</sup>. 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<sup>-1</sup>, grain mass head<sup>-1</sup>, plant height and panicle length. Non-additive gene action was predominant for number of fingers head<sup>-1</sup>, finger width and panicle width. The parents which contributed towards high yield were <em>Seremi 2</em>, <em>Achaki</em>, <em>Otunduru</em>, <em>Bulo</em> and <em>Amumwari</em>. 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.</p>

Studies on combining ability in high yielding drought tolerant mungbean genotypes under West Bengal condition

2018 ◽  
Author(s):  
M Sen ◽  
D K De
Keyword(s):  
Combining Ability ◽  
West Bengal ◽  
Gene Action ◽  
The Other ◽  
Additive Gene Action ◽  
Drought Tolerant ◽  
Combining Ability Analysis ◽  
Additive Gene ◽  
Seedling Characters ◽  
Half Diallel

Combining ability analysis was carried out in an 8x8 half-diallel fashion in mungbean to understand the combining ability, nature of gene action for thirteen yield and its components in 28 hybrids and their 8 parents. These 8 genotypes were already classified into drought tolerant and drought susceptible types from a laboratory study where PEG (6000) (-3) bar was used to impose drought stress against control for studying the seedling characters. The analysis of variance due to combining ability for the thirteen yield attributing traits in F1 population and their parents revealed that variances due to GCA and SCA were highly significant for all the characters indicating that these traits were controlled by both additive and non-additive gene action. Results also showed that cross combinations producing significantly superior SCA effect generally involved one of the parents with good GCA effect and the other had been either medium or poor combiner. Transgressive breeding has been opined to be useful in such cases. After compilation of the results it was found that only two cross combinations viz. SML-286(S) x B-1(T) and PDM-54(T) x K-851(T) were superior performers with respect to 7 and 5 characters including yield. Therefore, progeny of these two crosses may be pursued for obtaining lines with higher yield and tolerance to drought.

scholarly journals Genetic Analysis of Some Agronomic Traits in Okra (Abelmoschus esculentus L. [Moench])

2020 ◽  
Vol 23 (1) ◽  
pp. 56-59
Author(s):  
Muyideen Oluseyi Olayiwola ◽  
Deborah Doyinsola Olaniran ◽  
Adesola Lateef Nassir ◽  
Omolayo Johnson Ariyo
Keyword(s):  
Plant Height ◽  
Combining Ability ◽  
Gene Action ◽  
Agronomic Traits ◽  
Block Design ◽  
Additive Gene Action ◽  
Pod Yield ◽  
Early Maturing ◽  
Additive Gene ◽  
Pod Length

AbstractA study was carried out at the Federal University of Agriculture Abeokuta, Nigeria to determine the gene action underlying the inheritance of important agronomic traits as well as the general combining ability (GCA) and specific combining ability (SCA) of the parents and hybrids, respectively. Ten hybrids were developed by crossing five lines to two testers. The hybrids and parents were evaluated on the field in a randomised complete block design replicated three times, and data were collected on days to 50% flowering, number of branches, stem diameter, plant height, pod length, pod width, pod weight, number of pods and pod yield. The data were subjected to line by tester analysis and results showed substantial variability among the genotypes for some of the characters measured. Days to 50% flowering, number of pods and pod yield were largely under additive gene action while non-additive gene action was more important in the inheritance of plant height. Favourable GCA and SCA effects for days to 50% flowering were observed in NGB00356, NGB00326 and NGB00347 × NGB00326, respectively. The tester NGB00326 had a positive and significant GCA effect for number of pods while the highest positive SCA effect for pod yield was found in NGB00297 × NGB00326. Thus, NGB00356 and NGB00326 could be considered as sources of alleles for development of early maturing while the cross NGB00297 × NGB00326 could be exploited for high yielding okra genotypes.

Heterosis and combining ability for yield and other agronomic traits in Triticale

2018 ◽  
Vol 3 (1) ◽  
pp. 38-45 ◽  
Author(s):  
Enzo Ferrari ◽  
Aurora Picca ◽  
Rodolfo Domínguez ◽  
Héctor Paccapelo
Keyword(s):  
Combining Ability ◽  
Gene Action ◽  
Agronomic Traits ◽  
Diallel Cross ◽  
Kernel Weight ◽  
Selection Strategy ◽  
Additive Gene Action ◽  
Additive Gene ◽  
Additive Genetic Effects ◽  
Cross System

Abstract The estimation of genetic parameters such as heterosis (Mh), heterobeltiosis (Hh), general combining ability (GCA) and specific combining ability (SCA) allows inferences about the predominant action of the genes, indicates the appropriate selection strategy, and facilitates identification of the best parents. The present study was carried out using a diallel cross system among five genotypes of Triticale (x Triticosecale Wittmak). Genotypes CIMMYT 829 (G1), CIMMYT 830 (G2), CIMMYT 834 (G3), CIMMYT 820 (G4) and Antonio UNLPam (G5) were crossed in a complete diallel combination without reciprocal crosses, in La Pampa, Argentina. The additive genetic effects were of greater importance than the nonadditive ones for the following traits: spike length (SL), days to anthesis (AD), spikelets per spike (SS); grains per spike (GS), 1000-kernel weight (1000-KW), grain yield (GY), test weight (TW) and harvest index (HI). The G1 and G4 parents showed better GCA for GY, HI, 1000-KW and SL indicating a greater contribution of additive gene action and a promising feature to obtain prominent recombination lines. The G1xG4 cross showed Hh and a significant SCA value for GY, indicating a greater contribution of the non-additive gene action, useful to develop hybrids.

scholarly journals COMBINING ABILITY FOR YIELD AND YIELD CONTRIBUTING CHARACTERS IN KENAF (Hibiscus cannabinus L.)

2013 ◽  
Vol 24 (1) ◽  
pp. 01-06 ◽  
Author(s):  
M. G. Mostofa ◽  
L. Rahman ◽  
M. M. Hussain
Keyword(s):  
Combining Ability ◽  
Gene Action ◽  
Hibiscus Cannabinus ◽  
The Other ◽  
Additive Gene Action ◽  
Yield Attributes ◽  
Combining Ability Analysis ◽  
Additive Gene ◽  
Pedigree Selection ◽  
Fibre Yield

Combining ability in 6 x 6 half diallel crosses were estimated for yield and yield contributing characters in kenaf (Hibiscus cannabinus L.). Combining ability analysis revealed that mean square due to general combining ability (GCA) and specific combining ability (SCA) were significant for all the characters studied suggesting the presence of both additive and non-additive gene action for the inheritance of the concerned characters. The magnitude of GCA variance was considerably higher than that of SCA variance for days to 1st flowering, fibre weight per plant and 1000-seed weight indicating the importance of additive gene action for these traits. The other characters were preponderantly controlled by non-additive gene action. Ranking of parents on GCA performance indicated that parent P6 (Acc.2731) was the best general combiner for fibre yield and yield attributes. On the other hand, parents P2 (Acc.4197) and P3 (Acc.2922) were found to be the best for seed related traits. On SCA performance, the crosses P3 x P5, P1 x P6, P3 x P6 and P4 x P5 were found to be the best for fibre related traits, while the best specific crosses for seed related traits were P2 x P3 and P2 x P4. For the development of high fibre or seed yielding kenaf varieties, either pedigree selection method or recurrent breeding is suggested depending on the genetic behavior of the trait.DOI: http://dx.doi.org/10.3329/bjpbg.v24i1.16307

HETEROSIS AND COMBINING ABILITY OF BARLEY HYBRIDS IN DENSELY AND WIDELY SEEDED CONDITIONS

1971 ◽  
Vol 51 (2) ◽  
pp. 115-122 ◽  
Author(s):  
T. C. YAP ◽  
B. L. HARVEY
Keyword(s):  
Combining Ability ◽  
Genetic Variance ◽  
Gene Action ◽  
Agronomic Traits ◽  
Unit Area ◽  
Heading Date ◽  
General Combining Ability ◽  
Hordeum Vulgare L ◽  
Additive Gene Action ◽  
Additive Gene

All possible crosses were made among the four commercial barley (Hordeum vulgare L. emend. Lam.) cultivars, ’Conquest’, ’Gait’, ’Jubilee’ and ’Olli’, and evaluated under space-seeded (12 seeds/3.66 m × 0.61 m) and densely seeded (250 seeds/4.88 m × 0.15 m) conditions. For the six agronomic traits measured, no substantial heterosis was found. The number of heads per unit area was consistently correlated with grain yields. Heading date and plant height showed similar trends in both tests, whereas grain yield and the components of yield showed different behavior in the two tests. The major portion of the genetic variance for the traits measured was due to variation in general combining ability, indicating that additive gene action was more important than non-additive gene action. Moreover, general combining ability effects were less susceptible to environment than the specific combining ability effects.

Combining ability analysis in mungbean [Vigna radiata(L.) Wilczek]

2017 ◽  
Author(s):  
Anamika Nath ◽  
S. R. Maloo ◽  
Baudh Bharti ◽  
R. B. Dubey ◽  
Rajani Verma
Keyword(s):  
Seed Yield ◽  
Combining Ability ◽  
Gene Action ◽  
General Combining Ability ◽  
Specific Combining Ability ◽  
Mean Square ◽  
Additive Gene Action ◽  
Gene Effects ◽  
Combining Ability Analysis ◽  
Additive Gene

A diallel method was employed in which eight genotypically diverse lines of mungbean were crossed among themselves in all possible combinations excluding reciprocals. The mean square due to general combining ability (GCA) and specific combining ability (SCA) were significant for all the characters except mean square due to (SCA) for clusters per plant and seed yield per plant indicating importance of both additive as well as non-additive gene action. The estimates of variances due to specific combining ability were higher than general combining ability for all the traits except days to 50 % flowering, primary branches per plant, clusters per plant and seed yield per plant pointed out to be the preponderance of non-additive gene effects in the expression of these characters. Whereas predictability ratios were greater than the value of 0.5 for days to 50 % flowering, primary branches per plant, clusters per plant and seed yield per plant indicating the predominance of additive gene action for these characters. However, predictability ratio exhibited less than 0.5 values for rest of the characters indicating the predominance of non- additive gene action. The good general combiners for seed yield per plant were BM-4, PDM-139, ML-131, and IPM 99-125. The best specific cross combinations wereRMG-344 x RMG-1045, RMG-1035 x RMG-1045 and BM-4 x PDM-139. showed the highest positive significant SCA effect for seed yield per plant. These cross combinations could be utilized for further use in breeding programme for improvement in yield of mungbean.

scholarly journals Genetic analysis of physiological indicators of drought tolerance in bread wheat using diallel technique

Genetika ◽  
2015 ◽  
Vol 47 (1) ◽  
pp. 107-118 ◽  
Author(s):  
Ezatollah Farshadfar ◽  
Reza Amiri
Keyword(s):  
Drought Tolerance ◽  
Bread Wheat ◽  
Analysis Of Variance ◽  
Combining Ability ◽  
Gene Action ◽  
Block Design ◽  
Additive Gene Action ◽  
Gene Effects ◽  
Chl A ◽  
Additive Gene

In order to study genetic architecture of physiological criteria of drought tolerance in wheat using different diallel techniques, an experiment was conducted on six bread wheat genotypes as parents and their 15 hybrids in a randomized complete block design with three replicates under rainfed conditions at the Research Farm of the Campus of Agriculture and Natural Resources, Razi University, Kermanshah, Iran during 2010- 2011 cropping season. The results of analysis of variance showed significant differences between the genotypes for relative water content (RWC), relative chlorophyll content (RCC), chlorophyll a (Chl a), chlorophyll b (Chl b), total chlorophyll (Chl T) and proline concentration (PC). RWC, Chl T and PC exhibited significant differences for general combining ability, indicating the involvement of additive gene action in their inheritance. Moreover, as specific combining ability was not significant for all studied traits, hence these traits are predominantly controlled by additive gene action. Parent number one was the best general combiner for improvement of RWC, RCC and Chl b, while the best general combiner for improvement of Chl a, Chl T and PC was parent number five. Also, the best specific combination for improvement of RWC, RCC, Chl a, Chl b, Chl T and PC were the crosses 2?4, 1?2, 3?6, 1?6, 1?6 and 1?4, respectively indicating that parents of these crosses are genetically varied. Hayman and Morley-Jones analysis of variance revealed that the inheritance of RWC, Chl a, Chl b, and Chl T was mainly controlled by additive gene effects, while PC was controlled by both additive as well as dominance type of gene action.

scholarly journals The Effects of Combining Ability for Yield Traits in Rice (Oryza sativa L.) under Sodic Soil

2020 ◽  
pp. 34-44
Author(s):  
Durgesh Kumar Shukla ◽  
S. N. Singh ◽  
S. C. Gaur ◽  
Anil Kumar
Keyword(s):  
Combining Ability ◽  
Gene Action ◽  
Oryza Sativa L ◽  
Hybrid Vigour ◽  
Yield Traits ◽  
Additive Gene Action ◽  
Early Maturity ◽  
Additive Gene ◽  
Rice Genotypes ◽  
Positive Effect

Information on combining ability is derived from data on twelve yield and yield contributing characters in fifteen male and three female parents utilised in line x tester fashion to estimate combining ability of rice genotypes under coastal saline condition. Forty Five hybrids generated from crossing three lines with fifteen testers were studied along with their parents for combining ability and gene action involved in the expression of characters in rice. The gca and sca effects were significant for all the characters. The magnitude of sca variance was higher than the gca variance for all the characters revealed the presence of predominance of non-additive gene action for all the characters under study. Halchal (-12.29) was found to be good general combiners for days to 50% flowering and early maturity, Halchal (-13.39). However, IR-24 (1.88) was good general combiners with significant positive effect for tallness. Magic (-12.05) good general combiners for dwarfness and Shriram 434 (1.57) was good general combiners for test weight however, Moti was best general combiner with gca estimates of 7.07 for harvest index and Kuber (3.48) was the good general combiners for yield/hill. Cross combinations RHR 27 x IR 24 (4.04) was significant and positive effect for yield/hill, performance for ear bearing tillers per plant were RHR 27 x IR 24 (1.88). In general, the crosses showing significant and desirable combining ability effects were associated with better per se performance for the respective traits. These hybrids could be utilized in heterosis breeding to exploit hybrid vigour.

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

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.

scholarly journals Assessment of Combining Ability Effects for several Yield and Quality Traits in a Complete Diallel Cross of Strawberry (Fragaria × ananassa Duch.)

2017 ◽  
Vol 45 (2) ◽  
pp. 517-524
Author(s):  
Sorin CIULCA ◽  
Natalia CARP ◽  
Emilian MADOŞA ◽  
Adriana CIULCA ◽  
Radu ŞUMĂLAN
Keyword(s):  
Combining Ability ◽  
Gene Action ◽  
Sugar Content ◽  
Fruit Weight ◽  
Yield Traits ◽  
Quality Traits ◽  
Additive Gene Action ◽  
Plant Yield ◽  
Yield And Quality ◽  
Additive Gene

Information on the inheritance of yield and quality traits is important for the selection of parents and breeding approaches to be adopted for the improvement of strawberry. The present study aimed to estimate the combining ability and gene effects for plant yield, fruits number/plant, fruit weight, pulp firmness and sugar content of strawberries in order to identify the best genitors and promising crosses, in 30 hybrids of six parents. The additive and non-additive gene action as well as the maternal effects was involved in the inheritance of the studied traits. For all traits, especially for fruit weight and plant yield, the additive gene action was more important than the non-additive one. The parents ‘A1’ and ‘Alba’ showed a higher concentration of favourable alleles for plant yield and fruits number, and they will allow the increase of plant yield when used as a donor of pollen and the increase of fruit number when used as a recipient of pollen. The variety ‘Marmolada’ was a good general combiner for sugar content, pulp firmness and fruit weight, especially when used as a female genitor. These parents could be used in hybridization in order to accelerate the genetic improvement of some yield and quality traits in strawberries. The cross ‘Mira’ × ‘Onda’ expressed desirable specific combining ability effects for yield traits and can be successfully use in strawberries breeding programs. In the case of ‘Alba’ × ‘Clery’ there is a high probability to select progenies with valuable yield traits associated with sweet fruits.

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