scholarly journals Combining ability and heterosis on yield and its component traits in maize (Zea mays L.)

2016 ◽  
Vol 41 (3) ◽  
pp. 565-577 ◽  
Author(s):  
MZA Talukder ◽  
ANM S Karim ◽  
S Ahmed ◽  
M Amiruzzaman
Keyword(s):  
Combining Ability ◽  
Diallel Cross ◽  
Kernel Weight ◽  
Early Maturity ◽  
Ecological Zones ◽  
Component Traits ◽  
Additive Gene ◽  
Positive Heterosis ◽  
Half Diallel ◽  
Kernel Yield

Combining ability and heterosis were studied in a 7×7 half diallel cross in maize for grain yield and yield contributing characters. Significant general and specific combining ability variances were observed for all the characters studied. The significant estimates of GCA and SCA variances suggested the importance of both additive and non-additive gene actions for the expression studied traits. In these studies, variances due to SCA were higher than GCA for all charactesr, which revealed the predominance of non additive gene action (dominance and epistasis) for controlling these traits. Parents P1 and P4 were excellent general combiner for days to tasseling and silking while P1 and P5 for early maturity. P4 for short height and, P4 and P7 for higher thousand kernel weight. The parents P4 and P6 having good combining abilities for yield. Heterosis estimation was carried out using two commercial varieties NK40 and 900MG. When standard commercial check NK40 was used, the percent heterosis for kernel yield varied from -51.39 to 12.53%. Among the 21 F1s, 3crosses exhibited significant positive heterosis for kernel yield. The highest heterosis was exhibited by the cross P4×P6 (12.43%), P6×P7 (10.89%) and P2×P3 (9.87%) respectively. Compared with 900MG as check, the percent heterosis for kernel yield varied from -53.73 to 7.01%. Among the 21 F1s, none of the crosses exhibited significant positive heterosis for kernel yield. The highest heterosis were exhibited by the crosses P4×P6 (7.01%), P6 x P7 (5.55%) and P2×P3 (4.57%). The crosses showed significant positive SCA values could be used for variety development after verifying them across the agro-ecological zones of Bangladesh.Bangladesh J. Agril. Res. 41(3): 565-577, September 2016

scholarly journals Combining ability study in waterlogged tolerant maize (Zea mays L.)

2014 ◽  
Vol 39 (2) ◽  
pp. 283-291 ◽  
Author(s):  
MN Amin ◽  
M Amiruzzaman ◽  
A Ahmed ◽  
MR Ali
Keyword(s):  
Combining Ability ◽  
Genetic Variance ◽  
Zea Mays L ◽  
Additive Genetic Variance ◽  
Diallel Cross ◽  
Kernel Weight ◽  
Hybrid Variety ◽  
Additive Gene ◽  
Ear Height ◽  
Kernel Yield

Combining ability was studied for kernel yield and yield components in a 8×8 diallel cross of waterlogged tolerant maize. Significant general and specific combining ability variances were observed for all the characters studied. Additive genetic variance was preponderant in plant height, ear height, ear length, ear diameter, and kernel weight and non-additive gene action was involved in days to silking, number of kernels per ear and kernel yield. The parental lines E-31 and E-79 were found to be the best general combiners for yield. The good combining parents for different traits could be used in hybridization to improve yield and other desirable traits as donor parents for the accumulation of favourable genes. The cross combinations, E 31× E 40, E 31× E 64, E 31× E 79, E 38× E 40, E 58× E 79, E 63× E 79, E 64 × E 79 showing significant and positive sca effects can be used for commercial hybrid variety development after verifying them at different locations. DOI: http://dx.doi.org/10.3329/bjar.v39i2.20430 Bangladesh J. Agril. Res. 39(2): 283-291, June 2014

INHERITANCE OF YIELD AND OTHER QUANTITATIVE CHARACTERS IN BRASSICA NAPUS VAR. NAPOBRASSICA

1982 ◽  
Vol 24 (4) ◽  
pp. 459-465 ◽  
Author(s):  
I. Grant ◽  
Patricia M. Harney ◽  
B. R. Christie
Keyword(s):  
Brassica Napus ◽  
Combining Ability ◽  
Root Length ◽  
Diallel Cross ◽  
Root Diameter ◽  
Fresh Weight ◽  
Brassica Napus L ◽  
Partial Dominance ◽  
Additive Gene ◽  
Positive Heterosis

Highly significant positive heterosis was found for root length, diameter and fresh weight in F1 hybrids derived in a seven-parent diallel cross of commercially available cultivars of Brassica napus L. var. napobrassica Mill. Significant general combining ability and specific combining ability effects and a preponderance of additive gene action were also noted for root length, diameter and fresh weight. The inheritance of these three traits is thought to be conditioned by additivity at the majority of loci and partial dominance at the remaining ones. Heritability estimates ranged from 0% for dry matter to 26% for root diameter.

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

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

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 ANALYSIS FOR FRUIT YIELD AND ITS COMPONENT TRAITS IN BHENDI (ABELMOSCHUS ESCULENTUS (L.) MOENCH)

2021 ◽  
Vol 21 (No 1) ◽  
Author(s):  
C. Praveen Sampath Kumar ◽  
T. Tamil Mathi ◽  
J.L. Josh ◽  
Darling B. Suji ◽  
Ajish Muraleedharan
Keyword(s):  
Plant Breeding ◽  
Combining Ability ◽  
Diallel Analysis ◽  
Fruit Weight ◽  
Fruit Yield ◽  
Flowering Plant ◽  
Fruit Length ◽  
Component Traits ◽  
Additive Gene ◽  
Half Diallel

The present investigation was undertaken to evaluate six parents and fifteen hybrids through half-diallel mating system to study general and specific combining ability effects and genetic analysis for various yield and yield attributing characters. Six parents viz., Arka Anamika (P1), Thanvi 66 (P2), Villupuram Local (P3), Dhaanya (P4), Ankur 41 (P5) and Varsha Uphar (P6) were crossed in half-diallel fashion at the Plant Breeding Farm, Department of Genetics and Plant Breeding, Faculty of Agriculture, Annamalai University. Resulting fifteen hybrids along with their parents were evaluated for their combining ability. Observations were recorded on single plant basis. The observations were made on characters namely, days to first flowering, plant height at maturity, number of primary branches per plant, number of nodes per plant, number of fruits per plant, number of seeds per fruit, fruit length, fruit girth, single fruit weight and fruit yield per plant. In half-diallel analysis, the variance of the genotype for all the characters were highly significant indicating high genetic variability among the parents studied. The variance due to GCA was higher than the corresponding variance due to SCA for most of the characters except number of fruits per plant, fruit length and fruit girth. The combining ability variance revealed the preponderance of additive gene action for all the characters studied. The parents P1 and P6 were found as good general combiner. Based on the sca effects, the hybrid P1 x P6 considered as the best followed by crosses P2 x P4 and P3 x P4 considered as the better hybrids.

scholarly journals Estimates of combining ability and standard heterosis for grain yield and various agromorphological traits in rice (Oryza sativa L.)

2017 ◽  
Vol 9 (1) ◽  
pp. 526-532
Author(s):  
Gaurav Kamboj ◽  
Pradeep Kumar ◽  
Devi Singh
Keyword(s):  
Grain Yield ◽  
Combining Ability ◽  
Gene Action ◽  
Oryza Sativa L ◽  
Breeding Method ◽  
Additive Gene Action ◽  
Component Traits ◽  
Additive Gene ◽  
Standard Heterosis ◽  
Half Diallel

A study was conducted for estimating combining ability and standard heterosis for grain yield and various agromorphological traits involving 10 parents and their 45 F1s (half diallel) during 2012-13 and 2013-14. The results of present investigation revealed that additive gene action played a predominant role in the inheritance of most of the traits under study. On the basis of general combining ability (GCA) effects and specific combining ability (SCA) effects, three parents (Vallabh Basmati 21, Pusa Basmati 1, CSR 13) and three crosses (Vallabh Basmati 21 x Pusa 1121, Pusa 1121 x CSR 13 and Pusa Basmati 1 x CSR 13) were found good general and specific combiners. The best combinations mostly involved good x good and good x poor parental GCA effects suggesting that there is addi-tive x additive and additive x dominance type of gene action for yield and other component traits. The cross showing additive gene action can be improved by pedigree breeding and selection can be postponed to later generations. The most appropriate breeding method for the exploitation of non additive gene action will be heterosis breeding. The six best cross combinations (Vallabh Basmati 21 x CSR 30, CSR 30 x CSR 13, Vallabh Basmati 21 x CSR 13, CSR 30 x Pusa basmati 1, Pusa basmati 1 x CSR 13 and Vallabh Basmati 21 x Pusa basmati 1) had significant standard heterosis for grain yield and other component traits. The crosses which showed significant standard heter-osis is highly suitable for commercial exploitation of heterosis in rice crop.

COMBINING ABILITY FOR KERNEL PLUMPNESS IN A DIALLEL CROSS OF FIVE CANADIAN BARLEY CULTIVARS

1974 ◽  
Vol 54 (1) ◽  
pp. 29-34 ◽  
Author(s):  
K. G. BRIGGS
Keyword(s):  
Combining Ability ◽  
Gene Action ◽  
Diallel Cross ◽  
Reciprocal Effects ◽  
Mean Values ◽  
Barley Cultivars ◽  
Complete Diallel Cross ◽  
Additive Gene ◽  
Positive Heterosis ◽  
Degree Of Similarity

A complete diallel cross of Bonanza, Conquest, Galt, Jubilee, and Olli barley was made and the parents, F1 and F2 bulks, were subjected to a kernel-sizing procedure, using five different standard sieves. Mean values for the P, F1, and F2 were obtained and heritabilities and estimates of general (GCA) and specific (SCA) combining ability were calculated. Reciprocal effects were not significant in either F1 or F2. For the F1 data significant differences could only be found on the 19 × 2.4-mm (3/4 × 6/64-inch) sieve. Only GCA was significant for the F1, suggesting additive gene action. By contrast, in the F2 GCA was highly significant for all sieve sizes from 19 × 2.2 mm (3/4 × 11/128 inch) upwards, and SCA was significant on those of size 19 × 2.4 mm (3/4 × 6/64 inch) upwards. For the F2 on the 2.4-mm (6/64-inch) screen, the SCA effect exceeded the GCA effect in magnitude, and was in a negative direction, contributing to the two cases of negative heterosis for kernel plumpness. No significant positive heterosis was found in F2, and F2 bulks were normally intermediate in value to their parents. The amount of SCA effect was unrelated to the degree of similarity of the parents by pedigree, or to whether they were malting or feed types. Bonanza, Conquest, and Jubilee were significantly plumper than Galt and Olli, and Olli transmitted its less plump kernel type to the F2 generation, as indicated by its large negative GCA effect. None of the other cultivars exhibited significant GCA effects. Little progress in increasing kernel plumpness can be expected from crosses between these cultivars, as heritabilities were also generally low.

scholarly journals Genetic parameters and combining ability of some important traits in rice (Oryza sativa L.)

Genetika ◽  
2017 ◽  
Vol 49 (3) ◽  
pp. 1001-1014 ◽  
Author(s):  
Hasanalideh Haghighi ◽  
Ezatollah Farshadfar ◽  
Mehrzad Allahgholipour
Keyword(s):  
Combining Ability ◽  
Genetic Parameters ◽  
Amylose Content ◽  
Oryza Sativa L ◽  
Block Design ◽  
Regression Line ◽  
Diallel Cross ◽  
Combining Ability Analysis ◽  
Additive Gene ◽  
F2 Generation

In order to study the combining ability, genetic parameters and gene actions of yield, yield components and quality characters in rice, fifteen F2 generation of a 6?6 diallel cross, excluding reciprocals, was grown in a randomized complete block design (RCBD) with three replications. The results of analysis of variance showed significant differences between the genotypes for grain yield (GY), 100-grain weight (HGW), number of panicles per plant (PN), panicle length (PL), number of full grains per panicle (FGN) and for quality characters including amylose content (AC) and gel consistency (GC). The results of combining ability analysis revealed that general combining ability (GCA) and specific combining ability (SCA) were significant for characters GY, FGN, GC, AC, HGW and PN indicating the involvement of additive and non-additive effects in their inheritance, however high amounts of Bakers ratio remarked that additive gene effect had more portion in controlling these traits. The best combiners for GY, HGW, FGN, PN and PL, were RI18447-2, IR 50, Daylamani, RI18430-46 and Daylamani respectively. For AC and GC, the best combiner was Daylamani. Hayman's graphs showed that regression line passed below the origin cutting Wr axis in the negative region for HGW, PN, PL and GC, indicating the presence of over dominance. Estimates of genetic parameters showed significant amount of H1 and H2, and non-significant amount of D for the characters GY, PN, PL and GC, which confirmed the existence of dominance in the inheritance of these traits.

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.

Combining Ability Estimates in Heat Tolerant Tomato (Solanum lycopersicum L.) Genotypes

2010 ◽  
pp. 113-120
Author(s):  
S Ahmad ◽  
AKM Quamruzzaman ◽  
M Nazim Uddin
Keyword(s):  
Combining Ability ◽  
Agricultural Research ◽  
Relative Magnitude ◽  
Fruit Weight ◽  
Research Centre ◽  
Gene Effects ◽  
Additive Gene Effects ◽  
Component Traits ◽  
Additive Gene ◽  
Tomato Genotype

The experiment was conducted at the experimental farm of Olericulture Division, Horticulture Research Centre, Bangladesh Agricultural Research Institute, Joydebpur, Gazipur from May to August 2003. Combining ability effects were estimated for yield and component traits in a 8 x 8 diallel design excluding reciprocals in tomato. The variances for general combining ability (GCA) and specific combining ability (SCA) were highly significant indicating the presence of additive as well as non-additive gene effects in the traits studied. The relative magnitude of these variances indicated that additive gene effects were more prominent for all the characters under study. The tomato genotype P1 (TM051) proved to be the best general combiner for yield followed by P2 (TM053) and the combinations P1xP3, P1xP5 and P5xP7 were identified as the best specific combiner for earliness, yield per plant, number of fruits per plant and individual fruit weight.

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